If your Check Engine light is constantly trying to get your attention, one possible problem could be a bad O2 sensor. If you do have a failed oxygen sensor, follow these steps to replace it.

I just want to be sure of a couple of things here:<BR><BR>1) Because my problem is sensor 1 in bank 1, I should be purchasing an O2 sensor marked "before catalytic converter," correct?<BR><BR>2) O ...