Quote:
Originally Posted by hassmaschine
IMO it was likely damaged during the R&R of the valvecover. There are numerous N52s with far higher mileage on the original sensor, so I don't think they fail generally because of age. Either that or perhaps the more leak prone plastic cover leads to the sensor failing sooner than it otherwise wood.
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All possibilities, but the ESS sits on the front side of the cover where it seems highly unlikely to receive an impact (not sure it would do much anyway). Gasket could soften the blow if the cover was somehow slightly misaligned — though I have seen people say they put the gasket in after they dropped the cover. But only thing you could really do there is clip one of the connection tabs. Functional parts are below and the contact points are recessed.
Only thing I could see is if oil somehow dripped into the exposed sensor connection when removing the VC - which a different way to get the same common failure. Which would suck if you didn't notice when it happened.
Anyway, thanks again for sharing.