If headlamps or other vehicle lamps are fogged up on the inside, car drivers usually consider this to be a defect. However, in some cases this is a physical phenomenon. This page explains how this can come about. You will also find out what to do if water collects in the headlamp or other vehicle lamps. There is also a step-by-step guide for replacing faulty lamps, which provides a number of practical tips.

With the above-mentioned vehicle, various failures/malfunctions (cruise control, gear selector) may occur in conjunction with the multifunction steering wheel. The error message "cruise control failed" may then appear in the instrument cluster.

Upon identifying a steady coolant loss in the above-mentioned vehicles, check all coolant hose connections and the radiators for leaks. We recommend pressurising the cooling system with a suitable tool according to the manufacturer's specifications.

If the headlamps on this vehicle are permanently on and / or it is not possible to switch between low and high beam, the cause could be a faulty multifunction switch. In addition, the error may be stored in the control unit.

Injection valves provide each cylinder with the required fuel and simultaneously atomise the fuel so that it can burn most effectively in the combustion chamber. Scroll through this page and find out how injection valves work and potential fault symptoms. You will also find useful tips for performing troubleshooting work on injection valves with the engine running and switched off.

If the above-mentioned defect is detected, it may be related to a problem with the keyless central locking system. Because of water ingress and corrosion affecting the door handle switches, the receiver detects an opening request and sends this signal to the body control unit.

You probably have not had this vehicle in your workshop before. In order to save you searching for the cabin filter, here are a few installation and removal instructions.

On the above-mentioned vehicle with a start-stop system, the engine control lamp may suddenly come on. At the same time, there may be a drop in engine performance. Error codes P0300 / P301 / P302 / P0303 / P0304 (cylinders 1-4 misfiring) may be stored in the control unit.

The rain sensor is a driver assistance system which takes the strain off the driver by automatically activating the windshield wiper system when it rains and thereby significantly improving in-vehicle safety and comfort. In the mid-1990s, the rain sensor started to be fitted in vehicles and since then has been a permanent feature of modern vehicle electronics.

If the error message "SCBS / City emergency stop assistant forward gear malfunction" is displayed on the instrument cluster on the vehicle models mentioned above, one cause for this may be a defective boost pressure sensor.

If the error message "SCBS / City emergency stop assistant forward gear malfunction" is displayed on the instrument cluster on the vehicle models mentioned above, one cause for this may be a defective boost pressure sensor.

If a defect is detected in the starter or starter motor on the vehicle models mentioned above, a possible cause may be a defective ignition lock.