My new V40 was a very good offer (350 euros) but apart from a dent in the fender, the engine control light shines permanently. However, he passed the exhaust test and the engine runs well. In the error memory there were first 3 errors stored. After deletion there was one error left: “EFI-131 Engine speed (RPM) sensor, signal rotty” In English: “EFI–131 speed sensor, signal activated” (must be deactivated) Does anyone know this error? And why does the motor run super with this error?