The CEL and trac lights are both on in the wife's 95 400SC. I drove it Sunday, no CEL or track lights on, hit the brakes hard 1 time both came on immediately. Checked for code, and it's 27 (sub o2s). Which sensor is the "sub"?
Also, a few months ago, we had a problem with it stalling under hard braking, could these be related or could it be the IAC?