If the Check Engine warning lamp comes on in the above-mentioned vehicle and the error code P0401 (EGR system, exhaust gas flow too low) is stored in the control unit, a faulty or clogged EGR valve may be the cause.

The crankshaft sensor is one of the key providers of information of the engine control. It detects the speed and position of the crankshaft and forwards this information to the engine control in the form of an electrical signal. On this page, you can find out how crankshaft sensors work, and what must be taken into account when checking them in order to prevent damage.

In order to be able to adjust lamps, they firstly have to be made accessible. To do this, please proceed as follows:

• Remove the ventilation grille on the left under the windscreen
• First turn the screw in the grille using a suitable tool in order to release the locking mechanism.

With the above-mentioned vehicle model, it can happen that disturbing rattling noises are heard from the engine compartment shortly after starting the engine. One possible cause could be vibration noises on the actuating rod of the bypass flap on the turbocharger.

In the above-mentioned vehicle, water can enter the passenger footwell as a result of faulty sealing on the cabin air filter box. This is particularly noticeable during rapid acceleration. Car carpet and floor mats can then become quite wet. Water can also get into the interior fan, which leads to loud, squeaky noises being emitted from the fan.

If the above vehicle model experiences engine starting difficulties regardless of the temperature, one possible cause may be a defective intake manifold pressure sensor. At the same time, the error code 17036 "Sensor reference voltage B: too low" may be stored in the error memory of the engine control unit. 

If the warning lamp for the engine oil level lights up on the vehicles mentioned above, the oil level must be checked immediately and, if necessary, oil must be added. Checking the oil level at regular intervals is recommended.

The parking assistant is a driver assistance system that supports drivers during manoeuvring and parking and warns them of obstacles in the immediate vicinity of the vehicle. The traditional parking aid operates on the basis of ultrasound that is emitted using several sensors. If an obstacle is detected, the driver is informed of this either visually or acoustically.

With the vehicle mentioned above, it can happen that a warning message is issued in connection with the hybrid system. The error message appears in the instrument cluster: "Fault in the vehicle electrical system, voltage converter". The system prompts the driver to bring the vehicle to a standstill.

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

In the above-mentioned vehicle types, faulty shifting behaviour of the DSG gearbox may occur. The cause of the fault is not always to be found in the gearbox periphery.

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.