If you do a search on OVP you'll see that some part numbers are bad and some are good. You've probably got a good one, but it is an easy thing to verify - you can do it in a couple of minutes.

If you verify that the OVP part number is good, then my nest step would be to do a search on "crank position sensor" and see if that fits your symptoms. It might be what is causing you problems.

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Jonathan

2011 Mazda2
2000 E320 4Matic Wagon
1994 C280 (retired)