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
- Wire open or shorted to positive
- Valve coil
- Valve connector or wiring
What you can do yourself
- The exhaust pressure regulator partly closes the exhaust so the diesel warms up faster in the cold. With this fault the engine takes longer to warm up and the heater is weaker in winter.
- Measure the valve coil resistance: open circuit or zero means the valve needs replacing.
OOleg’s tip: check the connector
Often the cause is simple — there is no contact in the connector (plug). Look at the connector from the back: remove the rubber seal and you will see whether a wire is corroded or has come off completely. Corrosion shows up as green deposits. Ideally, gently pull each wire towards you one at a time: a sound wire stays in place, while a corroded one simply comes off — it needs to be repaired.
Unplug and inspect connectors with the ignition off.
The explanation comes from the error code reference in the AvtoElektrik PRO app.