In Reply to: OBC / Crazy temp readout! posted by Jeff N. on November 01, 1999 at 17:52:51:
I had a readout problem in my '89 535 and it turned out to be water in the sensor connector. The readings were not as extreme as yours though. I removed the probe from the connector and found water, dried it thoroughly and reconnected. The next time I drove off it read the correct temperature and has been fine ever since.