All within a week, 10 CEL's, = 6 o2 heater circuits. The fix, of course, in all 6 cases were new sensors. (too easy) One Mitsubishi Eclips with B1S1 and B2S1 (don't remember the year), one 03 Honda Pilot was B1S2, and 3 GM's.

(The other 4 were OBD1 and not o... Login to read more.