Risk of accident

The brake boosting effect is malfunctioning and the braking characteristics may be affected.
– Pull over and stop the vehicle safely as soon as possible, paying attention to road and traffic conditions. Do not continue driving under any circumstances.
– Engage the electric parking brake.
– Consult a qualified specialist workshop.
– Observe the additional display messages in the multifunction display.

Risk of accident

There is not enough brake fluid in the brake fluid reservoir.
– Pull over and stop the vehicle safely as soon as possible, paying attention to road and traffic conditions. Do not continue driving under any circumstances.
– Engage the electric parking brake.
– Consult a qualified specialist workshop immediately.
– Observe the additional display messages in the multifunction display.
Do not add brake fluid. This will not rectify the malfunction.

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

Risk of accident

ABS (Anti-lock Brake System) is deactivated due to a malfunction.
BAS (Brake Assist), BAS PLUS, ESP® (Electronic Stability Program), PRE-SAFE®, PRE-SAFE® Brake, the HOLD function, hill start assist and ESP® trailer stabilization are therefore also deactivated, for example.
The brake system continues to function normally, but without the functions listed above. The wheels could therefore lock if you brake hard, for example.
ATTENTION ASSIST is deactivated.
– Observe the additional display messages in the multifunction display.
– Drive on carefully.
– Visit a qualified specialist workshop.
If the ABS control unit is faulty, there is also a possibility that other systems, such as the navigation system or the automatic transmission, will not be available.

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

Risk of accident

ABS is temporarily unavailable. BAS, BAS PLUS, ESP®, EBD (electronic brake force distribution), PRE-SAFE®, PRE-SAFE® Brake, the HOLD function, hill start assist and ESP® trailer stabilization are therefore also deactivated, for example.
Self diagnosis is not yet complete or the on-board voltage may be insufficient, for example.
The brake system continues to function normally, but without the functions listed above. The wheels could therefore lock if you brake hard, for example.
ATTENTION ASSIST is deactivated.
– Carefully drive a suitable distance making slight steering movements at a speed above 12 mph (20 km/h).
The functions mentioned above are available again when the warning lamp goes out.
If the warning lamp is still on:
– Observe the additional display messages in the multifunction display.
– Drive on carefully.
– Visit a qualified specialist workshop.

The yellow ABS warning lamp is lit while the engine is running. A warning tone also sounds.

Risk of accident

EBD is faulty. Therefore, BAS, BAS PLUS, ESP®, PRE-SAFE®, PRESAFE ® Brake, the HOLD function, hill start assist and ESP® trailer stabilization are also unavailable, for example.
The brake system continues to function normally, but without the functions listed above. The wheels could therefore lock if you brake hard, for example.
ATTENTION ASSIST is deactivated.
– Observe the additional display messages in the multifunction display.
– Drive on carefully.
– Visit a qualified specialist workshop.

The red brake warning lamp, the yellow ESP® and ESP® OFF warning lamps and the yellow ABS warning lamp are lit while the engine is running.

Risk of accident

ABS and ESP® are faulty. Therefore, BAS, BAS PLUS, EBD, PRESAFE ®, PRE-SAFE® Brake, the HOLD function, hill start assist and ESP® trailer stabilization are also unavailable due to a malfunction, for example.
The brake system continues to function normally, but without the functions listed above. The wheels could therefore lock if you brake hard, for example.
ATTENTION ASSIST is deactivated.
– Observe the additional display messages in the multifunction display.
– Drive on carefully.
– Visit a qualified specialist workshop.

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

Risk of accident

ESP® or traction control has intervened because there is a risk of skidding or at least one wheel has started to spin.
Cruise control or DISTRONIC PLUS is deactivated.
– Only depress the accelerator pedal as far as necessary when pulling away.
– Ease off the accelerator pedal while the vehicle is in motion.
– Adapt your driving style to suit the road and weather conditions.
– Do not deactivate ESP®.

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

Risk of accident

ESP® and ESP® trailer stabilization are deactivated. ESP® will not stabilize the vehicle if it starts to skid or if a wheel starts to spin.
– Reactivate ESP®.
– Adapt your driving style to suit the road and weather conditions.
If ESP® cannot be activated:
– Have ESP® checked at a qualified specialist workshop.

The yellow ESP® and ESP® OFF warning lamps are lit while the engine is running.

Risk of accident

ESP®, BAS, BAS PLUS, PRE-SAFE®, PRE-SAFE® Brake, the HOLD function, hill start assist and ESP® trailer stabilization are unavailable due to a malfunction. ESP® will not stabilize the vehicle if it starts to skid or if a wheel starts to spin.
The brake system continues to function normally, but without the functions listed above.
ATTENTION ASSIST is deactivated.
– Observe the additional display messages in the multifunction display.
– Drive on carefully.
– Visit a qualified specialist workshop.

The yellow ESP® and ESP® OFF warning lamps are lit while the engine is running.

Risk of accident

ESP®, BAS, PRE-SAFE®, the HOLD function, hill start assist and ESP® trailer stabilization are temporarily unavailable.
BAS PLUS and PRE-SAFE® Brake may also have failed.
ESP® will not stabilize the vehicle if it starts to skid or if a wheel starts to spin.
Self diagnosis is not yet complete.
The brake system continues to function normally, but without the functions listed above. The wheels could therefore lock if you brake hard, for example.
ATTENTION ASSIST is deactivated.
– Carefully drive a suitable distance making slight steering movements at a speed above 12 mph (20 km/h).
The functions mentioned above are available again when the warning lamp goes out.
If the warning lamp is still on:
– Observe the additional display messages in the multifunction display.
– Drive on carefully.
– Visit a qualified specialist workshop.

The red indicator lamp for the electric parking brake flashes and/or the yellow

warning lamp for the electric parking brake lights up.

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

Risk of injury

The restraint systems are malfunctioning. The air bags or ETDs may either be triggered unintentionally or, in the event of an accident, not be triggered at all.
– Drive on carefully.
– Visit a qualified specialist workshop immediately.