What's your oil pressure reading when engine is off?

[Ahsai]

I suspect my oil pressure sender is shot ('03 C2 coupe). My oil pressure reads 0.5 bar to 2 bar or anywhere in between in the morning or after shut down, when the engine is not even on! Also, it pegs at 5 bar when rev > 2,200 rpm. It wasn't like that before.

Also, the other day while cruising on the highway, the oil pressure went to zero and the oil pressure warning light came on the OBC. Stopped the car and restarted, everything was fine. The car drives normally.

Any thoughts?

[RFM]

Probably a faulty sender, you can check for corroded connectors on top of the sender first.

[Ahsai]

Probably a faulty sender, you can check for corroded connectors on top of the sender first.

Thanks. BTW, the connectors are not spade/socket type but rather two srew-in terminals. They feel pretty tight to me but they are exposed (no rubber boot) and I could see some oxidation on them. I have extended warranty so I would ask a shop to repair it but I want to be sure before I bring the car in.