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
- Open wire or poor contact in the connector
- Flap actuator (electric motor or solenoid valve)
- ECU (rarely)
What you can do yourself
- Check the flap actuator connector on the intake manifold: corrosion, a broken latch.
- Usually the car drives as before; a diesel may go into limp mode with weak pull.
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.