I concur with Arthur's recommendation. Clean up the pins on the OVP, clear the codes, and drive it. Check after a few days to see what comes back. If code 49 comes back I would suggest replacing the OVP.

There is only one O2 sensor on this car. How does it run from a cold start, before the O2 sensor readings are used? I wouldn't consider replacing the O2 sensor until you determine whether the OVP is defective or not.

The code 11 on pin 14 is a common thing to see and doesn't mean much. Check the throttle and bowden cables to make sure there is some slack when the throttle is closed, but otherwise don't worry about it.

Pin 6 is either the climate control or airbag system, don't recall off the top of my head. Either way it doesn't have anything to do with engine operation.

- JimY