Basic car malfunctions Mercedes A-Class (W168)

Identifying and troubleshooting engine faults
If the engine does not start, then gradually narrow the search for the fault. For the engine to start, two basic conditions must be met: the fuel-air mixture must enter...

Identifying and troubleshooting engine cooling system faults
When the engine is running, the red indicator light flashes There is too little coolant in the circulation system The expansion tank must be filled to the maximum mark....

Possible malfunctions of the heating system, their causes and methods of elimination
The fan is not working Blown fan motor fuse Check the fuse, replace if necessary. The fan switch is faulty Remove the switch and check it. Replace if necessary. The fan...

Identifying and troubleshooting gasoline injection system faults
Before searching for the cause of the malfunction, the following troubleshooting conditions must be met, namely: a) Incorrect actions when starting the engine are...

Identifying and troubleshooting diesel engine fuel system faults
Before troubleshooting, the following conditions must be met: erroneous actions when starting the engine must be excluded; there must be fuel in the tank; fuel system...

Identifying and troubleshooting brake system faults
Too much free travel of the brake pedal Failure of one of the brake circuits Check the brake circuits for brake fluid leaks For drum brakes only: Sticking of the...

Identifying and troubleshooting battery problems
Too low capacity. Voltage drops sharply The battery is discharged Recharge the battery. Charging voltage too low Check the voltage regulator, replace if necessary. The...

Identifying and troubleshooting generator faults
The battery charge indicator light does not light when the ignition is on The battery is discharged Charge the battery. The battery terminals are loose or the terminals...

List of starter faults and their elimination
The starter does not rotate when the key in the ignition switch is turned to the appropriate position The battery is discharged Charge the battery. Break or poor...

Identifying and troubleshooting windshield wiper problems
Poor glass cleaning quality. Smudges, smears The rubber band is dirty Clean the rubber band with a hard nylon brush and detergent or alcohol. Fringe on the working...

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