Sufficient coolant liquid amount is prerequisite for flawless operating of engine. On this page, we show you the functions of the coolant, the ideal mixing ratio and how to determine the antifreeze content in coolant.

In the above-mentioned vehicles, the engine may cut out again shortly after starting at low outside temperatures (-10 °C). This is often the case when the vehicle has been parked overnight.

If loud, booming noises are heard from the rear of the vehicle, defective rear wheel bearings may be the cause. 
The rear wheel bearings may have been damaged by a design-related malfunction of the rear wheel brakes during assembly.

With the above-mentioned vehicle, it may happen that the vehicle interior monitoring system, every so often, triggers the vehicle alarm. A faulty ultrasonic sensor of the vehicle interior’s lamp unit is a possible cause.

The classic low beam is in fact a compromise solution, and it's not without its weaknesses. Thanks to its new light functions, the Advanced Front Lighting System (AFS) eliminates the rigid boundaries of the low beam, thereby significantly improving visibility in the dark and in poor weather.

In the above-mentioned vehicles, a software error may cause one headlamp to remain sporadically on after the lights have been switched off.

A loss of engine power and rough idling in the vehicles mentioned above may be caused by defective injection valves. An additional stored error code P0093 indicates that there is a pressure drop in the fuel system.

An undefinable buzzing noise heard in the vehicles mentioned above when the air conditioning is switched off may be caused by the air conditioning compressor. The buzzing noise occurs when the engine is at idle speed and may be caused by an internal voltage fault in the compressor.

Aftertreatment is carried out to convert the pollutants produced during combustion into harmless exhaust gases. Exhaust gas aftertreatment components include catalytic converters and particulate filters. Nowadays, both components can be installed on a direct-injection petrol engine as well as on a diesel engine.

With this repair issue, the customer complains about receiving a variety of error messages in the instrument cluster. The cause of the above-mentioned problem is a damaged electrical cable (rubbing against the steering column).

Daytime running lights increase safety in road traffic. This is why they are already fitted as standard in newer vehicles. On this page, discover the advantages of daytime running lights compared to low beam lights.

A faulty motor coolant pump can cause coolant to enter the brake system's vacuum system. Furthermore, oil can enter the system via the tandem pump.