Originally Posted by gld1203

Thanks for the good info, lsmalley. Based on the code book link you provided, I bought a Bosch O2 sensor and installed it last night. CEL is now off, and the exhaust smells like it could pass emissions tests again. Start up is now immediate and the m103 settles into a solid idle at ~650.

Solving a CEL for <$100 makes me happy!