No worries, I wasn't planning to replace stuff willy-nilly. The only info in the Bentley says it may be in the ECU. But I agree with you, it's likely to be just a bad connection somewhere. Fun part is figuring out where. There's quite a few E36's being parted on Craigslist around here now, so even replacing the ECU shouldn't be too bad money-wise. Will the CE light go out as soon as the connecion (or ECU) is repaired? Then I could easily swap parts with a loaner and watch the results.