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 brake chamber pressure sensor or its connector
- An air leak: hose, chamber, valve
- The brake control unit (EBS)
What you can do yourself
- Check the air pressure gauges and listen for leaks at the wheels and brake chambers.
- If the vehicle drags or the wheels get hot, a brake isn’t releasing — stop.
Stop and don’t drive on if:
- The low air pressure light is on or the buzzer sounds
- The air pressure gauges on the dashboard are below the normal range or dropping
- The brakes have got worse, or the vehicle is braking by itself
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.