i SCANNED MY obdii and came up with a bad O2 sensor code a while back. changed the O2 upper bank sensors my rear sensors are programmed out. fast forward to two days ago I'm still getting the O2 sensor code. says heater faulty. I'm running long tube headers, 523 lift cam, and custom exhaust to make a short list of whats done mechanically. im guessing since I don't have any cats my upper bank O2 sensors aren't getting hot enough to read properly. Am I making the correct assumption here ?? anyone know anything i can do to fix this without putting cats back on ? currently Im just clearing the code when it trips the check engine light.
Oxygen Sensor help........
- Thread starter dojrs
- Start date
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2005 tahoe, 5.3, 520 lift summit cam, trunions upgraded, new push rods, new oil pump, chevy performance valve springs, 1 7/8" long tube headers (cant rem brand - amazon they were cheapo's), 40 series flowmaster, new fuel pump. computer was re-programmed to accomodate the cam & everything.
Tonyrodz
Resident Resident
What brand O2 did you go with? Is the code telling you it's the same one that's bad?
I honestly dont remember the brand name of the O2 sensor I bought. Im not certain of the specifics of the code prior to me changing the sensors. The mechanic who re-programmed my ECM for the cam swap told me the O2 sensors were bad when I picked it up from him. I saw a youtube video yesterday of a gentleman who changed the O2 sensors in a totally different vehicle and it was having the same issue. The lack of catalyttic converter kept the exhaust temps cooler causing the O2 sensors to have a fault code. mine shows an O2 heater code fault.
Tonyrodz
Resident Resident
Strange. I've been running with no cats or down stream O2's for probably 4 years, and I've never had any problems with them. I just changed the one because it was lazy--but not setting any codes.
Tonyrodz
Resident Resident
Could you explain? I'm not understanding this. This goes for anyone? Get the O2 out of the exhaust stream?
Tony- Yes. it allows the heater to be more efficient. The only downside is the timer that sets code. Sometimes it doesnt work. about a 50/50 chance, but $15 fix.I havn't looked ino the programming yet. I've been successful 6 times of 11 tries.
can you upload a pic or link to one of these extenders
ok I'm even more confused i think at this point. how would placing an extender onto the O2 sensor cause it to be warmer?? I'm thinking if you place an extender on the O2 sensor it will cause it to be further from the exhaust gases and thus cause it to have a lower temperature..... I'm not a mechanic just thinking of it like a hand in proximity to a pot of boiling water. the closer the hand is to the water the hotter it will be. further away the hand is the cooler it will be.
