Common electrical problems:
* Defective battery
* Faulty generator or starter
* Wiring problems (break, short circuit, corrosion)
* Fuse or relay failure
* Poor contact between battery terminals and wires
* Problems with the grounding system
* Electromagnetic interference
Specific electrical problems:
Lighting system:
* Burnt out lamps
* Faulty light switch
* Faulty headlight wiring
* Turn signal relay malfunction
* Malfunction of warning lights
Ignition system:
* Faulty spark plugs
* Faulty ignition coils
* Faulty ignition module
* Problems with ignition wiring
* Faulty ignition distributor
Electronic systems:
* Faulty engine control unit (ECU)
* Faulty sensors (lambda probe, mass air flow sensor, etc.)
* Faulty actuators (idle air valves, throttle valve)
* Problems with the CAN bus (data network)
* Faulty comfort modules (control of power windows, heated seats, etc.)
Audio system:
* Faulty head unit (radio)
* Faulty speakers
* Problems with audio system wiring
Other problems:
* Malfunction of the central locking system
* Malfunction of ABS or ESP system
* Problems with power windows
* Electric sunroof malfunction
* Malfunction of the parking assistance system
Possible reasons:
* Component wear
*Corrosion
* Overheating
* Vibration
*Moisture
* Damage by pests (mice, rats)
* Improper maintenance