Date of printing:

08/13/2022

Online Owner's Manual [In depth | On-board computer and displays | Warning and indicator lamps in the instrument cluster]

Owner's Manual version: 06-13

Note: The online Owner's Manual is the latest version available. Deviations between this manual and items specific to your vehicle may occur since Mercedes-Benz constantly adapts its vehicles to the latest technology and modifies design and equipment. Please note that this online Owner's Manual does not under any circumstances replace the printed Owner's Manual which is supplied with the vehicle.

Warning and indicator lamps in the instrument cluster

Problem

Possible causes/consequences and > Solutions

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The yellow ASR/ESP® warning lamp flashes while the vehicle is in motion.

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WARNING

ESP® or ASR is intervening because at least one of the wheels has reached its tyre traction limit.

Cruise control is deactivated for the duration of the intervention.

Adapt your driving style to suit the road and traffic conditions. Do not use too much throttle.

Drive slowly.

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The yellow ASR/ESP® warning lamp flashes slowly while the vehicle is in motion.

On vehicles with all-wheel drive, the brake system has overheated.

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WARNING

The performance of 4ETS is limited. Braking power may be reduced.

There is a risk of an accident.

Drive on carefully and adapt your driving style to suit the road and traffic conditions.

When the message is no longer displayed, 4ETS and normal braking power are available again.

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The yellow ASR/ESP® warning lamp is lit while the engine is running.

ASR is deactivated.

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WARNING

The driven wheels can spin when accelerating.

There is an increased risk of skidding and accidents.

Activate ASR again. Exceptions more.

mbsymb4_inv_0068.png mbsymb2_inv_0021.png mbsymb1a_inv_003a.png mbsymb1a_inv_0062.png

The yellow ESP®, ABS and ASR/BAS indicator lamps and the red brake system indicator lamp are lit while the engine is running.

EBD is malfunctioning or deactivated due to undervoltage or malfunction.

The battery may not be charging.

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WARNING

The rear wheels could lock sooner than expected when you apply the brakes. The braking distance can increase in emergency braking situations.

There is an increased risk of skidding and accidents.

Vehicles with steering wheel buttons: also observe the messages in the display more.

Stop the vehicle as soon as possible, paying attention to road and traffic conditions.

Do not drive on.

Consult a qualified specialist workshop.

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The red brake system indicator lamp is lit while the engine is running.

There is insufficient brake fluid in the fluid reservoir.

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WARNING

Braking performance can be impaired.

There is a risk of an accident.

Vehicles with steering wheel buttons: also observe the messages in the display more.

Stop the vehicle as soon as possible, paying attention to road and traffic conditions.

Check the brake fluid level in the brake fluid reservoir more.

If the brake fluid is below the MIN mark:

Do not continue driving under any circumstances.

Do not top up the brake fluid. This does not solve the problem.

Consult a qualified specialist workshop.

If the brake fluid is above the MIN mark:

Drive on with care.

Visit a qualified specialist workshop immediately.

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The yellow ASR/BAS indicator lamp is lit while the engine is running.

ASR or start-off assist has been deactivated due to a malfunction.

The engine power output may be reduced.

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WARNING

The driven wheels can spin when accelerating.

There is an increased risk of skidding and accidents.

Drive on with care.

Consult a qualified specialist workshop as soon as possible.

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The yellow ASR/BAS indicator lamp is lit while the engine is running.

BAS has been deactivated due to a malfunction.

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WARNING

The brake system continues to function normally, but without electronic support.

The braking distance can increase in emergency braking situations.

There is a risk of an accident.

Drive on with care.

Visit a qualified specialist workshop immediately.

mbsymb1a_inv_003a.png

The yellow ASR/BAS indicator lamp is lit while the engine is running.

ASR, BAS and start-off assist have been deactivated due to undervoltage.

The battery may not be charging.

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WARNING

The brake system is still available with the normal braking effect.

The driven wheels can spin when accelerating.

The braking distance can increase in emergency braking situations.

There is an increased risk of skidding and accidents.

Drive on with care.

Visit a qualified specialist workshop immediately.

mbsymb2_inv_0021.png

The yellow ABS indicator lamp is lit while the engine is running.

ABS is deactivated due to a malfunction or is temporarily unavailable. ESP®, ASR and BAS, as well as cruise control and SPEEDTRONIC, are also unavailable as a result.

Self-diagnosis may not be complete, or the battery may not be charging.

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WARNING

The brake system continues to function normally, but without the functions listed above. The wheels could therefore lock, e.g. if the brakes are applied with maximum force.

This causes steerability and braking to be greatly impaired.

The braking distance can increase in emergency braking situations.

The driven wheels can spin when accelerating.

If ESP® is not operational, ESP® will not stabilise the vehicle.

There is an increased risk of skidding and accidents.

Drive on for a short distance at a speed of more than 20 km/h.

The functions mentioned above are available again when the indicator lamp goes out.

If the indicator lamp does not go out:

Drive on with care.

Visit a qualified specialist workshop immediately.

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The yellow ESP® indicator lamp is lit while the engine is running.

ESP® is deactivated due to undervoltage or a malfunction. Cruise control and SPEEDTRONIC have also been deactivated as a result.

Engine power output may be reduced.

The battery may not be charging.

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WARNING

If ESP® is not operational, ESP® will not stabilise the vehicle.

There is an increased risk of skidding and accidents.

Vehicles with steering wheel buttons: also observe the messages in the display more.

Drive on with care.

Visit a qualified specialist workshop immediately.

mbsymb2_inv_002b.png mbsymb2_inv_0036.png

Red SRS warning lamp mbsymb2_inv_002b.png or mbsymb2_inv_0036.png does not go out approximately 4 seconds after the ignition is switched on, or it lights up again.

The restraint systems have malfunctioned.

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WARNING

If SRS is malfunctioning, individual systems could be triggered inadvertently or might not be triggered at all in the event of an accident.

There is an increased risk of injury and accidents.

Drive on with care.

Visit a qualified specialist workshop immediately.

mbsymb2_inv_002b.png mbsymb2_inv_0036.png

Red SRS warning lamp mbsymb2_inv_002b.png or mbsymb2_inv_0036.png does not go out approximately 4 seconds after the ignition is switched on, or it lights up again.

Vehicles with automatic child seat recognition: if you fit a child seat without a transponder, automatic child seat recognition will malfunction. This can cause other restraint systems to malfunction.

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WARNING

The airbags or belt tensioners could be triggered unintentionally or might not be triggered at all in the event of an accident.

There is an increased risk of injury and accidents.

Remove electronic equipment from the co-driver's seat, e.g.:

  • switched-on laptop

  • mobile phone

  • cards with transponders, e.g. ski passes or access passes

If SRS warning lamp mbsymb2_inv_002b.png or mbsymb2_inv_0036.png is still lit:

Drive on with care.

Visit a qualified specialist workshop immediately.

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The red battery indicator lamp is lit while the engine is running.

The battery is not being charged. Possible causes are a defective alternator or a torn poly-V-belt.

Stop the vehicle as soon as possible, paying attention to road and traffic conditions.

Check the poly-V-belt.

If the poly-V-belt is torn: do not continue driving. Consult the nearest qualified specialist workshop.

If the poly-V-belt is not damaged: have the vehicle checked as soon as possible by a qualified specialist workshop.

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The red battery indicator lamp is lit while the engine is running.

The battery is faulty.

Stop the vehicle as soon as possible, paying attention to road and traffic conditions.

Do not continue driving under any circumstances.

Consult a qualified specialist workshop.

mbsymb1a_inv_0023.png

The yellow brake pad wear indicator lamp is lit after the engine is started or while the vehicle is in motion.

The brake pads/linings have reached their wear limit.

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WARNING

Braking performance can be impaired.

There is a risk of an accident.

Have the brake pads/linings replaced as soon as possible at a qualified specialist workshop.

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The yellow engine oil level warning lamp is lit after the engine is started or while the vehicle is in motion.

The oil level has dropped to the minimum level.

Check the engine for oil loss.

If oil loss is detected: consult a qualified specialist workshop immediately.

If no oil loss is detected: check the oil level and top up the engine oil more.

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The yellow engine oil level warning lamp flashes and the warning buzzer sounds after the engine is started or while the vehicle is in motion.

On vehicles with a diesel engine, the oil level display additionally appears in the display, e.g. - 2.0 ltr.

There is not enough or no oil in the engine.

There is a danger of engine damage.

Stop the vehicle as soon as possible, paying attention to road and traffic conditions.

Check the engine oil level using the oil dipstick more.

If the engine oil level is correct: have the malfunction rectified immediately at a qualified specialist workshop.

If the engine oil level is too low: have the vehicle towed to a qualified specialist workshop.

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The yellow engine oil level warning lamp lights up and the warning buzzer sounds after the engine is started or while the vehicle is in motion.

On vehicles with a diesel engine, the oil level display additionally appears in the display, e.g. HI.

The engine oil level is above the maximum level.

There is a risk of damaging the engine or catalytic converter.

Check the oil level.

If the oil level is too high: have the engine oil extracted as soon as possible at a qualified specialist workshop.

If the oil level is correct: have the malfunction rectified as soon as possible at a qualified specialist workshop.

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On vehicles with a diesel engine, the yellow engine oil level warning lamp lights up repeatedly during the journey.

There is a malfunction in the engine oil level display.

Have the vehicle checked immediately at a qualified specialist workshop.

mbsymb1b_inv_0025.png

The yellow coolant level warning lamp lights up while the engine is running.

The coolant level is too low.

Do not run the engine if the coolant level is too low. The engine could overheat and become damaged.

Stop the vehicle as soon as possible, paying attention to road and traffic conditions.

Switch off the engine and let it cool down.

Top up the coolant; be sure to observe the warning notes more.

If you need to top up the coolant frequently, have the engine cooling system checked at a qualified specialist workshop.

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The red coolant warning lamp is lit while the engine is running.

The coolant temperature is too high.

Stop the vehicle as soon as possible, paying attention to road and traffic conditions.

Consult a qualified specialist workshop.

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The red coolant warning lamp is lit while the engine is running.

The coolant temperature is too high.

If you stop the vehicle after it has been subjected to extreme loads, the coolant warning lamp may light up when the ignition is switched on or the engine is restarted. Such loads occur, for example, when driving in mountainous terrain or when towing a trailer.

Run the engine for approximately 1 minute at idling speed.

Consult a qualified specialist workshop if the display message continues to be shown.

mbsymb1b_inv_003f.png

The red coolant warning lamp is lit while the engine is running.

If the engine coolant level is correct, the radiator fan may be faulty.

Avoid heavy loads on the engine (e.g. driving in mountainous terrain) and stop-start traffic.

Have the engine cooling system checked at a qualified specialist workshop as soon as possible.

mbsymb1b_inv_0037.png nfz_ba2_inv_007c.png

The yellow reserve fuel warning lamp lights up while the engine is running.

The fuel level has fallen into the reserve range.

Refuel at the nearest filling station more.

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The yellow engine diagnostic indicator lamp is lit up or flashes while the engine is running.

The fuel tank is empty.

The engine is running in emergency running mode.

Refuel at the nearest filling station more.

Vehicles with a diesel engine: bleed the fuel system more.

Start the engine three to four times in succession after refuelling. Emergency running mode will be cancelled. The vehicle does not need to be checked.

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The yellow engine diagnostic indicator lamp is lit up or flashes while the engine is running.

There is a malfunction:

  • in the injection control

  • in the ignition system[1]

  • in the exhaust system

The emissions limit values may be exceeded, and the engine is running in emergency running mode.

Engine power output may be reduced.

Have the vehicle checked at a qualified specialist workshop as soon as possible.

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If you turn the key to position 2 in the ignition lock, the yellow preglow indicator lamp remains lit for approximately 1 minute. Or the yellow preglow indicator lamp lights up for approximately 1 minute while the engine is running.

At extremely low temperatures, the engine may not start.

There is a malfunction in the preglow system.

Have any malfunction rectified at a qualified specialist workshop.

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The yellow diesel particle filter indicator lamp is lit while the engine is running.

The automatic regeneration of the diesel particle filter is not sufficient or has malfunctioned.

Drive at an engine speed above 2000 rpm until the diesel particle filter indicator lamp goes out.

If the diesel particle filter indicator lamp does not go out after approximately 20 minutes: have the malfunction rectified immediately at a qualified specialist workshop.

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The yellow air filter indicator lamp is lit while the engine is running.

The service due date for the air filter has been reached. The air filter is dirty.

Have the air filter element replaced as soon as possible at a qualified specialist workshop.

mbsymb1_inv_0068.png

The yellow tyre pressure monitor warning lamp comes on.

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WARNING

The tyre pressure monitor indicates a rapid or severe loss of pressure in at least one tyre.

Stop the vehicle without making any extreme ‌steering manoeuvres or braking suddenly. Pay attention to the traffic conditions while doing so.

Check the tyres and correct the tyre pressure. If a tyre continues to lose pressure, it must be replaced. Replace damaged tyres immediately.

The warning light will go out after the flat tyre has been rectified and you have been driving for a few minutes.

Vehicles with steering wheel buttons: also observe the messages in the display more.

mbsymb1_inv_0068.png

The yellow tyre pressure monitor warning lamp flashes for 60 seconds and then remains lit.

Vehicles without steering wheel buttons:

The tyre pressure monitor has malfunctioned.

Have the tyre pressure monitor and the wheels checked at a qualified specialist workshop.

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The yellow water separator indicator lamp is lit when the ignition is switched on.

The water that has collected in the water separator of the fuel filter has reached the maximum level.

Drain the water separator more.

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The yellow washer fluid level indicator lamp for the windscreen washer/headlamp cleaning system is lit after the engine is started or while the vehicle is in motion.

The water level is too low.

Top up the washer fluid more.

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If you turn the key in the ignition lock to position 2, the red seat belt warning lamp lights up for approximately 6 seconds.

The warning lamp is to remind you to fasten your seat belt.

Fasten your seat belt more.

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When the key is turned to position 2 in the ignition lock, the yellow bulb warning lamp lights up.

One of the bulbs in the exterior lighting or on the trailer is faulty. For trailers with LED bulbs, please observe the notes in the "Bulb failure indicator on LED bulbs" section more.

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Depending on the equipment, the bulb failure indicator can fail for all lamps with the exception of the turn signal lamps.

Replace the faulty bulb as soon as possible more.

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The red indicator lamp for the E box is lit while the ignition is switched on.

The fan in the E box is malfunctioning.

Turn the key to position 0 and then back to position 2 in the ignition lock.

If the indicator lamp is still lit: contact a qualified specialist workshop.

mbsymb1_inv_0031.png

The yellow "door open" indicator lamp is lit while driving.

The vehicle is moving without all doors or the bonnet being closed.

Close the doors or bonnet.

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If you turn the key in the ignition lock to position 2, the red ENR indicator lamp lights up.

A malfunction has caused ENR to switch off or be deactivated because, for example, external influences have caused the vehicle to be raised while stationary.

The vehicle level is no longer automatically compensated. Handling and ride comfort may suffer.

Drive on for a short distance at a speed of more than 2 km/h.

ENR is activated automatically.

If the indicator lamp does not go out: drive on carefully and visit a qualified specialist workshop.

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The red ENR indicator lamp flashes while you are driving.

The vehicle level is too low or too high while driving.

Handling and ride comfort may suffer.

Drive on with care.

ENR adjusts the vehicle level to normal level as soon as possible.

If the lamp continues to flash: drive on carefully and visit a qualified specialist workshop.

An air bellow may be leaking.

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The yellow indicator lamp for the steering is lit when the ignition is switched on.

The power assistance for the steering has malfunctioned. You need to steer more forcefully.

Carefully continue to a qualified specialist workshop and have the steering checked immediately.

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The yellow indicator lamp for the clutch pedal is lit when the ignition is switched on.

You are attempting to start the engine and the clutch pedal is not completely depressed.

Before starting the engine, depress the clutch pedal as far as it will go.

Notes

[1]
Only on vehicles with a petrol engine.

Date of printing:

08/13/2022

Online Owner's Manual [In depth | On-board computer and displays | Warning and indicator lamps in the instrument cluster]

Owner's Manual version: 06-13

Note: The online Owner's Manual is the latest version available. Deviations between this manual and items specific to your vehicle may occur since Mercedes-Benz constantly adapts its vehicles to the latest technology and modifies design and equipment. Please note that this online Owner's Manual does not under any circumstances replace the printed Owner's Manual which is supplied with the vehicle.