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
- Unprogrammed or faulty key (incl. someone else's/non-original)
- Dead battery in the key transponder
- Faulty antenna at the ignition switch, corroded connectors
- Broken wiring, faulty PATS unit, ignition switch or PCM
What you can do yourself
- Make sure you're using the original programmed key
- Make sure the car battery is sufficiently charged
- Don't try to bypass PATS — it's unsafe
- With this fault the car usually can't be driven — take it to a technician/dealer for diagnostics
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.
Source: club.autodoc.co.uk
On Oleg’s website:Car computer diagnostics ↗
The explanation comes from the error code reference in the AvtoElektrik PRO app.