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
- Fan relay or fuse
- Wiring
What you can do yourself
- Watch the temperature. Check the fan fuse and relay (“Assistant” tab).
Stop and don’t drive on if:
- The Check Engine light is flashing
- The temperature gauge is in the red or the overheating light is on
- The red oil pressure light is on
- Smoke from under the bonnet, a burning or petrol smell
- Strong jerking, knocking from the engine, or the car barely moves
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.
OA case from Oleg’s practice
- Range Rover 2014 On-site diagnostics, 211.000 km: stored fan control codes (P0480, P0483, P0528), oxygen sensor codes and P0420. After clearing, all modules were “green” — we advised driving for a few days and checking again: the codes that come back will show what really needs fixing. How it went ↗
The explanation comes from the error code reference in the AvtoElektrik PRO app.