The knock sensor monitors the combustion process in the engine. Its signal helps the engine control to prevent knocking combustion and therefore protect the motor/engine control. On this page we will provide you with various information, including how a defective knock sensor becomes noticeable, the causes that may lead to its failure, and how it can be tested in the workshop.

The ABS/ESP warning lamp may light up sporadically on the above-mentioned vehicle series. After a restart, the warning lamp initially goes out again, but is reactivated after a short driving time.

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The DSC warning lamp on the above-mentioned vehicle series has been known to light up sporadically. In addition, various Check Control messages can be displayed in the instrument cluster.

In the above-mentioned vehicle series, an error message may suddenly appear, signalling the failure of a light source in the rear lamps. This series has a self-diagnosis function that checks the status of the light sources after the ignition has been switched on.

The increasing use of modern driver assistance systems continually changes the challenges faced by independent workshops. Radar-based assistance systems serve as one example: while their adjustment was the concern of the respective brand workshop until recently, independent workshops with the right equipment can now also easily carry out such work. 

The engine power may be reduced in the above-mentioned vehicles, as a result of which the engine warning lamp in the instrument cluster is activated. Error code P2563 is stored in the error memory of the engine control unit.

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The Active Distance Assist may fail sporadically in the above-mentioned vehicle type. This fault pattern mainly occurs in wet conditions. The entries C163AFA and C163AFB, radar sensor dirty or defective, can be stored in the error memory.

On the vehicle mentioned above, buzzing noises can be heard from the engine compartment when the air-conditioning system is switched off. These occur especially when the engine is idling.

LEDs are currently in the process of replacing classic bulbs in modern vehicles. They not only provide high luminous efficiency and increased safety, but also more design freedom and a great level of savings potential. On this page, those interested in technology can quench their thirst for knowledge regarding the basics of LED technology in vehicles.

We recommend the following procedure when replacing bulbs:

• Switch off the lighting and ignition.
• Remove the key and keep it in a safe place.
• Secure vehicle against rolling away. Apply the handbrake