A fault code doesn’t yet mean the unit or sensor itself is faulty: often it’s the plug and connector leading to it.
Possible causes
- The unit was replaced (new or from another car) but not coded to this car
- The unit’s part number or software version doesn’t match the car
- Reprogramming didn’t finish: the voltage dropped during it
- Less often, a fault in the unit itself
What you can do yourself
- The fuel-fired or electric auxiliary heater may not switch on. It doesn’t affect driving.
- This code usually appears after a unit was replaced or reprogrammed. Think about what was replaced or reprogrammed.
- Compare the labels on the old and new unit: part number, hardware (HW) and software (SW) numbers. If they don’t match, the unit may work incorrectly even if the car starts.
- The unit is coded to the car with a scan tool that supports this make. Connect a battery charger while this is done: if the voltage drops, the programming fails.
On Oleg’s website:Car wiring repair ↗
The explanation comes from the error code reference in the AvtoElektrik PRO app.