Thanks for the responses. The error message from is ECM-250a (Long Term Trim - Upper Limit). I think this can be associated with a vacuum leak or blown 02 sensor fuse (as stated above). Does anyone know how to check this fuse? Where can I find it? Also, from my initial post, I asked about the '06 S4...

My check engine light recently came on in my '06 S40. I've had the brake problem described above since last winter. The dealership said that the vacuum pump and switch failed, resulting in power being drawn from the engine (hence the check engine light). I'd like to fix this myself rather than payin...