Sounds to me you are experiencing the reason the car was sold.

My guess is that when ever you find the real problem you will have a nice car. Any problem that can be blamed repeatedly on an OVP or can cause a repeated OVP failure is genuinely unusual. Who knows maybe someone else will aquire this strange problem when you off it on someone else. SOP now days. Usually becomes a great deal that actually turns that way when or if a real tech figures it all out.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician