jillyjellyroll
06-12-2006, 05:42 PM
'97 318i Auto.
I have a CEL - I read the code, and the peake reader says "after cat oxygen sensor heater" - now does this mean the actual o2 sensor itself? or does it mean the heater relay? for that matter, what IS the heater relay? (there's no seperate entry for "heater relay" on the peake table)
also, i find it strange that the after cat would fail before the pre-cat, since i thought the pre-cat was the one that did most of the work?
I have a CEL - I read the code, and the peake reader says "after cat oxygen sensor heater" - now does this mean the actual o2 sensor itself? or does it mean the heater relay? for that matter, what IS the heater relay? (there's no seperate entry for "heater relay" on the peake table)
also, i find it strange that the after cat would fail before the pre-cat, since i thought the pre-cat was the one that did most of the work?
