A fault code doesn’t yet mean the unit or sensor itself is faulty: often it’s the plug and connector leading to it.
What you can do yourself
- When the computer won’t communicate or there are no 5 volts, it’s not necessarily the computer itself: 5-volt sensors can drag down the 5-volt line, and because of that the computer won’t even switch on.
- A short in one sensor pulls down the whole circuit: unplug the sensors one by one until the code goes away.
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
Add the FMI — the second number of the code. It shows what exactly is wrong with the parameter.
Source: SAE J1939-71: J-1939 SA/SPN/FMI Descriptions (static.nhtsa.gov, MC-10141869)
The explanation comes from the error code reference in the AvtoElektrik PRO app.