AO Platinum Member
Join Date: Aug 2003
Location: London, England
If you have quite long thin arms, it is a reasonably easy DIY job, but it is down the back of the engine and is done by feel, you won't be able to see it or see what you are doing.
When they fail like this, their resistance increases to 1K Ohm and at that point the ECU can't see the engine turning, so it thinks it has stalled and turns it off. When you try to start it, it still can't see it turning, so doesn't fire the injectors or the sparkplugs. So it doesn't start.
Quite often there won't be anything logged for it because as far as the ECU is concerned the engine simply isn't turning over, so nothing to log an error for!
Once the sensor has had time to cool down abit, its resistance falls to the point where it works again and the engine starts and runs fine, until the sensor heats up again and the engine stops.
Audi TT 3.2v6 DSG
xAlfa 156 Selespeed sp3 + Brembo conversion
Fiat Cinquecento 899cc