Hyundai i40 Warning Lights: Complete Dashboard Guide

Hyundai i40 warning lights are the car’s way of starting a conversation. Some simply whisper, “Your headlights are on,” while others shout, “Stop the engine before something expensive happens.” The challenge is knowing which message we are receiving.

When an unfamiliar symbol suddenly glows on the dashboard, it is easy to assume the worst. However, not every illuminated icon means the car is about to break down. Many lights are ordinary reminders, system-status indicators, or temporary alerts caused by a weak battery, cold weather, low fluid levels, or a sensor reading that falls outside its normal range.

The Hyundai i40 was sold with several petrol and diesel engines, manual and automatic transmissions, and different equipment packages. As a result, the exact dashboard symbols may vary depending on the model year, engine, trim level, and country. Even so, the core warning-light meanings remain broadly similar.

In this guide, we will explain the most important Hyundai i40 dashboard warning lights, what their colours mean, when it is safe to continue driving, and when we should stop immediately.

What Do Hyundai i40 Warning Light Colours Mean?

Before identifying individual symbols, we need to understand the dashboard’s colour system. Think of it like a traffic light inside the car. The colour often tells us how urgently we need to react.

Red Warning Lights

A red warning light usually signals a serious problem, a safety issue, or a condition that requires immediate attention. It may indicate low engine oil pressure, overheating, a charging-system fault, or a braking problem.

When a red light appears while driving, we should avoid ignoring it. Continuing to drive could damage the engine, reduce braking performance, or place the occupants at risk.

Red does not always mean mechanical failure. A red seat-belt symbol or open-door warning may simply indicate that something needs securing. Nevertheless, every red warning deserves a prompt response.

Amber or Yellow Warning Lights

Amber and yellow lights usually mean that a system requires inspection but may not demand an immediate stop. Examples include the check engine light, ABS warning, tyre-pressure alert, or diesel particulate filter warning.

The vehicle may still drive normally, but we should arrange a diagnosis soon. An amber light is rather like a polite knock at the door. Ignore it for too long, and the knock may eventually become a hammering sound.

Green and Blue Indicator Lights

Green and blue symbols usually confirm that a feature is operating. They are generally informational rather than warnings.

Common examples include:

• Green turn-signal indicators
• Green cruise-control light
• Blue high-beam indicator
• Green front fog-light symbol
• Headlight status indicators

These lights normally require no action unless they remain illuminated when the relevant feature has been switched off.

Why Do Warning Lights Appear When Starting the Hyundai i40?

When we switch on the ignition, multiple lights illuminate for a few seconds. This is known as a bulb check or system self-test.

The engine control unit, airbag system, ABS module, charging system, and other control units briefly activate their warning lights to confirm that the bulbs and circuits are working. Most should disappear after the engine starts.

A light that never appears during the self-test may have a failed bulb, damaged display, wiring problem, or previous modification. A light that remains on after the engine starts usually means the related system has detected a fault.

Hyundai i40 Check Engine Warning Light

The check engine light, also called the malfunction indicator lamp, usually resembles a small engine. It is one of the most common and misunderstood Hyundai i40 warning lights.

The engine management system monitors fuel delivery, ignition, emissions, airflow, exhaust gases, and dozens of sensor readings. If the computer detects a value outside the expected range, it stores a diagnostic trouble code and illuminates the warning light.

What Causes the Check Engine Light?

Possible causes include:

• Faulty oxygen sensor
• Dirty or defective mass airflow sensor
• EGR valve problems
• Turbo boost-control faults
• Injector issues
• Misfires
• Loose wiring connections
• Exhaust sensor failure
• Catalytic converter problems
• Diesel particulate filter issues
• Air or vacuum leaks
• Fuel-pressure faults

A simple code scan is the fastest way to narrow down the cause. The symbol alone cannot identify the defective component.

Steady Check Engine Light

A steady amber engine light usually means a fault has been recorded, but the problem may not be immediately destructive. If the Hyundai i40 drives normally, we can often continue carefully to a workshop.

We should avoid hard acceleration, high engine speeds, heavy towing, and long journeys until the fault has been investigated.

Flashing Check Engine Light

A flashing engine warning is more serious. It frequently indicates an active misfire capable of sending unburned fuel into the catalytic converter. The converter can overheat and suffer permanent damage.

Reduce speed, stop somewhere safe, and switch off the engine. Continuing to drive with a flashing check engine light can transform a relatively manageable ignition fault into a costly exhaust-system repair.

Hyundai i40 Oil Pressure Warning Light

The oil-pressure warning resembles an old-fashioned oil can. It should illuminate during the ignition self-test and disappear shortly after the engine starts.

If the light stays on or appears while driving, we should take it seriously. The engine relies on pressurised oil to protect its bearings, camshafts, turbocharger, and other moving components. Without adequate pressure, internal metal surfaces can grind together in seconds.

What Should We Do Immediately?

Follow these steps:

1. Pull over safely.
2. Switch off the engine.
3. Wait several minutes.
4. Check the engine oil level on level ground.
5. Add the correct oil only if the level is low.
6. Do not continue driving if the light remains illuminated.

Low oil level may cause the warning, but the lamp primarily indicates pressure rather than quantity. A defective oil pump, blocked pickup pipe, worn engine components, contaminated oil, or faulty pressure sensor could also be responsible.

Can We Drive With the Oil Light On?

No. Driving with a genuine oil-pressure fault is like running a marathon without blood circulating through the body. The engine may continue briefly, but severe damage can occur rapidly.

Hyundai i40 Engine Temperature Warning Light

The temperature warning usually resembles a thermometer over waves. A red temperature light indicates that the engine coolant is too hot.

Overheating can be caused by:

• Low coolant
• Coolant leakage
• Faulty thermostat
• Broken water pump
• Cooling-fan failure
• Blocked radiator
• Damaged hose
• Cylinder-head gasket failure

Turn off the air conditioning, reduce engine load, and stop safely as soon as possible. Switch off the engine and allow it to cool.

Never remove the coolant cap from a hot engine. Pressurised coolant can escape violently and cause serious burns.

Blue Coolant Temperature Light

Some Hyundai i40 versions may display a blue temperature indicator after a cold start. This usually means the coolant has not yet reached normal operating temperature.

It is not normally a fault. Drive gently and avoid high engine speeds until the blue light goes out.

Hyundai i40 Battery and Charging Warning Light

The red battery symbol does not necessarily mean that the battery itself is dead. It indicates a charging-system problem.

The alternator should generate electricity while the engine is running. If the charging warning stays on, the car may be operating only on the energy stored in the battery. Once that energy is exhausted, the engine can stop.

Possible causes include:

• Alternator failure
• Loose or broken auxiliary belt
• Corroded battery terminals
• Damaged wiring
• Faulty voltage regulator
• Weak battery
• Poor electrical ground connection

Switch off unnecessary electrical equipment such as heated windows, seat heaters, and the audio system. Arrange immediate inspection.

If the steering suddenly becomes heavy and the battery light appears, the auxiliary belt may have broken. On some engines, the same belt may affect other important components.

Hyundai i40 Brake Warning Light

The red brake warning often appears as an exclamation mark inside a circle. It may illuminate because the parking brake is applied, but it can also indicate low brake fluid or a hydraulic braking-system fault.

First, check that the parking brake has been completely released. If the warning remains on, stop safely and inspect the brake-fluid level.

Do not treat low brake fluid as an invitation to simply top up the reservoir. Brake fluid may fall because the brake pads are worn or because the system has developed a leak. Both situations require inspection.

When the Brake and ABS Lights Appear Together

If both the red brake warning and amber ABS light remain on, braking performance may be compromised. The anti-lock braking system, electronic brake-force distribution, or conventional hydraulic system may have a fault.

Avoid driving unless the vehicle must be moved out of danger. Professional recovery is usually the safer choice.

Hyundai i40 ABS Warning Light

The ABS warning displays the letters “ABS” inside a circle. ABS helps prevent the wheels from locking under heavy braking.

When the amber ABS light remains on, ordinary braking may still work, but the anti-lock function may be unavailable. The wheels could lock during an emergency stop, especially on wet, icy, or loose surfaces.

Common causes include:

• Dirty or damaged wheel-speed sensor
• Broken sensor wiring
• Damaged reluctor ring
• Low battery voltage
• Failed ABS control module
• Incorrect wheel-bearing installation
• Blown fuse

Because stability control also relies on wheel-speed information, an ABS fault may trigger additional traction-control or stability-control lights.

Hyundai i40 Electronic Stability Control Light

The electronic stability control symbol usually shows a car with wavy skid marks.

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Flashing ESC Light

A flashing ESC light normally means the system is actively correcting wheel slip. It may reduce engine power or apply individual brakes to help keep the car on its intended path.

This commonly occurs during hard acceleration, cornering, rain, snow, mud, or loose gravel. Ease off the accelerator and drive smoothly.

ESC Light Stays On

A continuously illuminated ESC light may indicate:

• The system has been switched off
• A wheel-speed sensor has failed
• Steering-angle calibration is incorrect
• The ABS system has a fault
• Battery voltage is low
• The ESC control unit has detected an error

Check whether the ESC OFF button has been pressed accidentally. If not, scan the vehicle for fault codes.

Hyundai i40 Tyre Pressure Warning Light

The tyre-pressure monitoring system symbol resembles a horseshoe-shaped tyre with an exclamation mark.

A steady warning usually means one or more tyres are significantly underinflated. Check all four tyres when they are cold and inflate them to the pressure listed on the driver’s door frame, fuel flap, or owner’s manual.

Do not rely on a universal pressure found online. The correct figure may change according to tyre size, engine, body style, passenger load, and driving conditions.

Flashing Tyre Pressure Light

If the warning flashes for approximately a minute and then stays on, the monitoring system itself may have a fault.

Possible causes include:

• Failed TPMS sensor battery
• Damaged sensor
• Unprogrammed replacement sensor
• Incorrect wheel installation
• Radio-frequency interference
• Control-unit problem

Why the Light Appears in Cold Weather

Tyre pressure falls as air temperature drops. A tyre that was only slightly above the warning threshold during warm weather may trigger the light on a cold morning.

Inflate the tyres correctly rather than waiting for warmer weather to make the warning disappear.

Hyundai i40 Airbag Warning Light

The airbag warning shows a seated person facing a circle. It should switch off after the initial system check.

If it stays on, the supplemental restraint system may have a fault. Depending on the cause, one or more airbags or seat-belt pretensioners may not deploy during a collision.

Potential causes include:

• Loose connector under a seat
• Seat-occupancy sensor fault
• Steering-wheel clock spring failure
• Low battery voltage
• Crash sensor fault
• Previous accident damage
• Seat-belt pretensioner problem

Avoid disconnecting or probing airbag wiring without proper knowledge. Airbag circuits require specialised procedures and safety precautions.

Hyundai i40 Power Steering Warning Light

The power-steering warning often resembles a steering wheel with an exclamation mark. The Hyundai i40 uses electrically assisted steering on many versions.

If the system develops a fault, the wheel may become considerably heavier, particularly at low speeds. Mechanical steering is generally still possible, but manoeuvring can require much more effort.

Sometimes the warning appears after the battery has been disconnected or voltage has fallen too low. Restarting the engine and slowly turning the steering wheel from lock to lock may restore calibration, but a persistent warning needs diagnosis.

Common causes include:

• Weak battery
• Charging-system fault
• Steering-angle sensor issue
• Electric motor fault
• Damaged wiring
• Control-module error

Hyundai i40 Diesel Particulate Filter Warning

Diesel Hyundai i40 models may display a diesel particulate filter warning when soot has accumulated in the exhaust filter.

The DPF captures soot and periodically burns it away through regeneration. Frequent short journeys, prolonged idling, and low-speed urban driving can prevent this process from completing.

Can We Clear the DPF Light by Driving?

If the warning has only recently appeared and the vehicle is otherwise running normally, a sustained journey at normal operating temperature may allow regeneration. Drive at a steady speed while maintaining moderate engine revolutions, provided road and traffic conditions allow it.

However, we should not attempt repeated high-speed drives when:

• The warning is flashing
• The engine has entered limp mode
• The oil level is above maximum
• Additional engine lights are illuminated
• The vehicle is producing unusual smoke
• Regeneration attempts have already failed

A heavily blocked DPF may require diagnostic regeneration, professional cleaning, or replacement.

Why Ignoring the DPF Light Becomes Expensive

As soot loading increases, exhaust backpressure rises. This can affect turbocharger performance, fuel economy, engine oil condition, and exhaust temperatures. What begins as a regeneration warning can eventually become a much larger repair bill.

Hyundai i40 Glow Plug Warning Light

On diesel models, the glow plug symbol looks like a small coil or spring. It normally illuminates briefly before starting, especially in cold conditions.

Wait for the symbol to go out before starting the engine. This allows the glow plugs to warm the combustion chambers.

If the light flashes or remains on while driving, it may indicate an engine-management or glow-system fault rather than simply cold weather.

Possible causes include:

• Failed glow plug
• Glow plug relay problem
• Wiring fault
• Fuel-injection issue
• EGR fault
• Engine sensor problem
• Brake-switch fault on some vehicles

A diagnostic scan is recommended because the flashing coil symbol can represent several different faults.

Hyundai i40 Low Fuel Warning Light

The low-fuel warning usually appears as a fuel-pump symbol. It means the remaining range is limited, but the exact distance available can vary considerably.

Driving style, road gradient, traffic, weather, fuel-system calibration, and vehicle load all influence how far we can travel.

Consistently driving with very little fuel is not a good habit. The fuel pump uses fuel for cooling and lubrication, and diesel systems can be difficult to restart after running completely dry.

Hyundai i40 AdBlue Warning Light

Some later diesel versions equipped with selective catalytic reduction may use AdBlue, although availability depends on model year and market.

An AdBlue warning can indicate:

• Low AdBlue level
• Incorrect fluid
• Dosing-system fault
• Heater problem
• Sensor failure
• Emissions-system malfunction

The warning may become progressively more urgent. If the tank becomes empty, the engine may not restart after it has been switched off.

Use only approved diesel exhaust fluid and avoid filling the diesel tank with AdBlue. The two filling points serve completely different systems.

Hyundai i40 Automatic Transmission Warning Light

An automatic transmission warning may appear as a gear symbol, an exclamation mark, or a message in the information display.

Symptoms can include:

• Harsh gear changes
• Delayed engagement
• Transmission stuck in one gear
• Reduced acceleration
• Clutch overheating message
• Failure to select Drive or Reverse
• Limp-home mode

The Hyundai i40 was offered with different automatic and dual-clutch transmissions depending on version and year. Diagnostic procedures therefore vary.

Stop driving if the transmission is slipping badly, overheating, making grinding noises, or leaking fluid. Continuing may turn a control or clutch problem into extensive internal damage.

Dual-Clutch Transmission Overheating

Some dual-clutch systems can overheat during prolonged creeping, steep hill starts, or repeated stop-and-go manoeuvres. Unlike a traditional torque-converter automatic, a dual-clutch gearbox uses friction clutches that can generate heat when partially engaged.

When possible, avoid holding the car on a hill with the accelerator. Use the brake or parking brake instead.

Hyundai i40 Water in Fuel Filter Warning

Diesel models may display a water-in-fuel-filter warning. Diesel fuel can contain moisture that collects in the filter assembly.

Excess water may damage high-pressure fuel-system components and interfere with combustion. The filter should be inspected and drained according to the correct workshop procedure.

Do not postpone this warning. Modern diesel injectors and pumps work at extremely high pressures and are costly to replace.

Hyundai i40 Immobiliser and Key Warning Lights

The immobiliser symbol may resemble a car with a key or a key-shaped icon. It confirms whether the vehicle recognises the transponder inside the key.

If the light flashes unexpectedly or the engine will not start, try:

• Using the spare key
• Replacing the key-fob battery
• Moving other electronic keys away
• Locking and unlocking the vehicle
• Checking the 12-volt battery
• Holding the smart key close to the start button

A flat remote battery does not always mean the immobiliser chip has failed. Many smart-key systems include a backup recognition method.

Hyundai i40 Lane and Driver-Assistance Warning Lights

Higher-specification or later Hyundai i40 models may include lane-departure assistance, automatic emergency braking, blind-spot monitoring, or related driver-support systems.

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These systems can display warnings if:

• A camera is blocked
• Radar sensors are dirty
• Heavy rain limits visibility
• Road markings are unclear
• Windscreen replacement disturbed calibration
• A sensor or control unit has failed

Clean the windscreen and exterior sensor areas carefully. If the warning remains after conditions improve, calibration or diagnosis may be required.

Driver-assistance features support the driver; they do not replace attention, braking judgement, or safe following distances.

Hyundai i40 Washer Fluid Warning Light

The washer-fluid light usually resembles a windscreen with water spraying upward. It is a low-priority warning, but visibility can quickly become a safety issue in rain, mud, snow, or salty road conditions.

Refill the reservoir with a suitable screen-wash mixture. Do not use plain water in freezing weather because it can freeze inside the tank, pump, hoses, and nozzles.

If the light stays on after refilling, the level sensor may be stuck or faulty.

Hyundai i40 Door, Boot, and Bonnet Warning Lights

These indicators show that a door, the tailgate, or the bonnet is not completely closed.

A door may appear shut while the latch has only reached its first position. Stop and close each opening firmly.

A persistent warning could be caused by:

• Misaligned latch
• Faulty microswitch
• Damaged wiring near a hinge
• Dirt inside the latch
• Tailgate adjustment problem

An open-door signal can also keep the interior lights illuminated and gradually discharge the battery.

Hyundai i40 Seat-Belt Warning Light

The seat-belt warning appears when the driver or a passenger has not fastened a belt. Some seats use occupancy sensors that detect weight.

Heavy bags, shopping, or electronic equipment placed on the passenger seat can sometimes trigger the warning. Move the item to the floor or luggage area rather than fastening the seat belt around unsecured cargo.

If the warning continues with no passenger or object present, the buckle switch or seat-occupancy sensor may need inspection.

Several Hyundai i40 Warning Lights Coming On Together

Seeing multiple warning lights at once can feel like the dashboard has turned into a Christmas tree. Fortunately, several simultaneous warnings do not always mean several unrelated systems have failed.

Modern vehicles share information between control modules. One faulty wheel-speed sensor, for example, may trigger:

• ABS warning
• Stability-control warning
• Traction-control warning
• Hill-start assistance warning
• Tyre-pressure-system fault on certain configurations

Low battery voltage can produce an even wider collection of apparently unrelated alerts.

Check Battery Voltage First

When many lights appear immediately after a difficult start, battery voltage should be one of the first checks. Control units require stable voltage. If the supply drops too low, sensors and modules may temporarily communicate incorrectly.

A healthy-looking dashboard does not prove that the battery is strong. A proper battery and charging-system test is more reliable than visual inspection.

Look for the First Warning, Not Just the Loudest

The first light that appeared may point to the original fault. Later warnings may simply be consequences.

For example, an alternator failure may first illuminate the battery light. As voltage continues to fall, the power steering, ABS, transmission, and airbag systems may begin reporting errors.

What Is Limp Mode on a Hyundai i40?

Limp mode is a protective strategy used by the engine or transmission control unit. When the system detects a potentially damaging fault, it limits power, engine speed, turbo boost, or available gears.

The car may feel slow, refuse to accelerate normally, or remain stuck in a particular gear.

Limp mode does not repair the problem. It merely helps reduce the chance of further damage while allowing the vehicle to reach a safe location.

Common triggers include:

• Turbo boost faults
• DPF blockage
• Fuel-pressure problems
• Airflow sensor faults
• Transmission errors
• Overheating
• Serious emissions-system faults

Avoid repeatedly restarting the vehicle simply to restore full power. The stored fault code still needs investigation.

How to Reset Hyundai i40 Warning Lights

A warning light should disappear only after the cause has been corrected. Clearing codes without repairing the fault is like silencing a smoke alarm while the kitchen is still burning.

Some temporary lights may reset after:

• Correcting tyre pressures
• Refilling washer fluid
• Tightening a loose connection
• Completing a successful DPF regeneration
• Replacing a weak battery
• Restarting after a temporary voltage drop

Others require a diagnostic scanner to clear stored fault codes or recalibrate sensors.

Should We Disconnect the Battery?

Disconnecting the battery may temporarily clear certain lights, but it is not a reliable diagnostic method. The warning often returns once the control unit detects the problem again.

Battery disconnection may also reset:

• Clock settings
• Window functions
• Steering-angle calibration
• Radio settings
• Transmission adaptations
• Stored diagnostic information

Repair first, reset second.

Can a Cheap Diagnostic Scanner Read Every Warning Light?

Basic OBD-II scanners usually read generic engine and emissions codes. They may not access the ABS, airbag, transmission, parking-brake, steering, or body-control modules.

For a complete Hyundai i40 diagnosis, we may need a scanner that supports Hyundai-specific systems.

A fault code does not automatically prove that the named sensor is defective. It identifies the circuit or condition the control unit has detected. Wiring, connectors, power supply, mechanical faults, and related components must also be considered.

When Should We Stop Driving Immediately?

Stop the Hyundai i40 as soon as it is safe when we see:

• Red oil-pressure warning
• Red engine-temperature warning
• Serious brake-system warning
• Flashing check engine light with rough running
• Charging warning accompanied by heavy steering or overheating
• Severe transmission overheating message
• Sudden loss of braking assistance
• Smoke, burning smells, or loud mechanical noises
• Rapid coolant or oil loss

Continuing to drive may endanger the occupants or dramatically increase repair costs.

When Is It Usually Safe to Drive Carefully?

A short, cautious journey to a garage may be reasonable when:

• An amber light is steady
• The engine sounds normal
• Braking and steering feel normal
• There are no leaks
• The temperature remains normal
• The vehicle has not entered severe limp mode
• The owner’s manual does not instruct us to stop

Even then, “safe to continue briefly” does not mean “safe to ignore for several months.”

A Practical Hyundai i40 Warning-Light Checklist

When a warning appears, use this simple process:

1. Note the symbol and colour.
2. Check whether it is flashing or steady.
3. Observe any dashboard message.
4. Listen for unusual sounds.
5. Check steering, braking, and engine behaviour.
6. Look for smoke or fluid leaks.
7. Stop immediately if a red critical warning appears.
8. Consult the owner’s manual.
9. Scan the relevant control modules.
10. Repair the cause before clearing the warning.

Taking a photograph of the dashboard can also help. Warning messages sometimes disappear after the engine is restarted, and an image gives the technician useful information.

How to Prevent Dashboard Warning Lights

We cannot prevent every electrical or mechanical fault, but regular care reduces the chances of an unexpected dashboard display.

Useful habits include:

• Check engine oil frequently.
• Monitor coolant and brake-fluid levels.
• Maintain correct tyre pressures.
• Replace a weak battery before it fails completely.
• Use the specified engine oil.
• Service the vehicle at the correct intervals.
• Address unusual noises promptly.
• Avoid repeated short journeys in diesel models.
• Keep cameras and radar sensors clean.
• Investigate minor warning lights before they become major ones.

Preventive maintenance is rarely exciting, but neither is waiting beside a broken-down car in the rain.

Conclusion

Hyundai i40 warning lights range from harmless status indicators to urgent alerts that can protect the engine, braking system, and passengers from danger. The most important clues are the colour of the light, whether it flashes, and how the vehicle behaves when it appears.

Red oil-pressure, overheating, and brake warnings demand immediate attention. Amber lights such as the check engine, ABS, TPMS, ESC, and DPF indicators usually allow more time, but they still require proper diagnosis.

We should resist the temptation to replace parts based only on the dashboard symbol. Modern cars are deeply interconnected, and one electrical, voltage, or sensor fault can create several warnings at once. Reading the correct fault codes, inspecting the system, and fixing the underlying cause is always more effective than simply clearing the dashboard.

Treat the warning lights as useful messengers rather than irritating decorations. Listen early, respond sensibly, and the Hyundai i40 is far less likely to turn a small concern into a wallet-emptying surprise.

Frequently Asked Questions

1. What is the most serious warning light on a Hyundai i40?

The red oil-pressure and engine-temperature warnings are among the most serious. Both can indicate conditions capable of causing major engine damage within a short period. Stop safely and switch off the engine.

2. Why are several warning lights showing on my Hyundai i40?

Multiple lights may result from a weak battery, alternator fault, wheel-speed sensor failure, communication error, or shared system problem. A full diagnostic scan is needed to identify the original fault.

3. Can I drive my Hyundai i40 with the check engine light on?

A steady amber check engine light may allow a careful, short journey if the car runs normally. Stop driving if the light flashes, the engine shakes, power drops severely, or smoke and unusual smells appear.

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4. How do I reset the tyre-pressure warning on a Hyundai i40?

Inflate all tyres to the specified cold pressure and drive for a short distance. The system may reset automatically. If the light flashes before remaining on, a TPMS sensor or system fault may require diagnosis.

5. Will disconnecting the battery clear Hyundai i40 warning lights?

It may temporarily clear some warnings, but it will not repair the cause. The lights are likely to return, and disconnecting the battery can erase useful diagnostic information or reset vehicle settings.

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