O2 Sensor Heater Circuit Malfunction!!!

[rodeo02]

Just got my very first CEL on our 2002 @ 28K miles. It almost brings tears to my eyes (literally). P0155, bank 2 sensor 1, O2 sensor heater malfunction (thanks to autozone). It came on a couple days ago right after a cold start & has been on ever since. The truck runs like a top. That O2 sensor (driver's side, pre-cat) looks like new, as does it's wiring and connector. Anybody know what an OEM replacement goes for these days? Autozone wants about $60, but I hate to chance is with an a/m unit. As luck would have it, oxygen sensors are only warranted for 2/24 per the manual .

Thanks!
Joel

[SOLSTER]

No help here, but posted as a sign of support! Too bad about that sensor trouble.

Does the 02 sensor need maitenance, is it part of a maitenance schedule, or just fix when broken?

Hope someone comes along with some help!

SOLSTER

[ibew595]

Look under the federal emissions warranty which is a lot longer

[anthonyn]

Originally Posted by rodeo02

JAnybody know what an OEM replacement goes for these days? Autozone wants about $60, but I hate to chance is with an a/m unit.
Thanks!
Joel

I would just get a bosch unit. I've never heard of anyone having problems with them. I replaced mine with a bosch and it worked fine. St Charles wanted something like 200 bucks for an OEM unit. But, mine is a 1st gen rodeo and may cost more then yours since mine has only one O2 sensor while yours has 4.

[amigo-2k]

Sounds like you took it out and reinstalled it right? I would clean up the connectors, disconnect the battery for a while and see what happens.

-Ryan

[rodeo02]

The fed. emssions warranty doesnt cover much, when it comes down to it. There's like 2-3 pages of stuff that are not covered by it, O2 sensors being one of them . Yep, the connections & wiring look perfect. It's kind of a bugger to get at where/how it's located. I disconnected the neg battery terminal over night & it cleared out the CEL for about 20 miles, then it came back. I dont get any lean/rich/slow/no activity codes from bank 2 sensor 1, just the "heater circuit malfuntion", so it *appears* this oxygen sensor is doing it's thing ?!?! I'd really hate to dump $200+ into one new OEM sensor, but I dont want to cut/splice an a/m unit onto a 2002!
Thanks
Joel

[2eyefishclaw]

02's not covered by emmissions warranty
the 02's on the newer models are crap definatly go BOSH if you can find it

[rodeo02]

Originally Posted by 2eyefishclaw

02's not covered by emmissions warranty
the 02's on the newer models are crap definatly go BOSH if you can find it

Thanks 2eye. I'm having a heck of a time finding a bosch replacement. For some reason you can find bosch for the 2002 2.2L, but not the 2002 3.2L. There are other brands available, but I dont wanna chance it. I have a great local 'zu dealership, but I dont want to have another OEM unit installed if it's gonna puke @ 28K miles! Back to the search I guess....
Thanks
Joel

[Canucklehead]

Originally Posted by rodeo02

I'm having a heck of a time finding a bosch replacement. For some reason you can find bosch for the 2002 2.2L, but not the 2002 3.2L.

Not sure if this helps or not, but when I replaced the O2 sensors on my '97 (3.2L) I used Bosch P/N 15703 that I purchased from AutoZone for ~$55 ea with tax.

[rodeo02]

Originally Posted by Canucklehead

Not sure if this helps or not, but when I replaced the O2 sensors on my '97 (3.2L) I used Bosch P/N 15703 that I purchased from AutoZone for ~$55 ea with tax.

Nope. Even the O2 sensors for a 2001 3.2 are different from the 2002 3.2L. I've found "walker" branded O2 sensors for my 2002, but I'm not sure they work. An "OEM" walker is $106 .

Joel

[95.5 Rodeo]

I didn't see anything written about the checking the fuse. My Rodeo has a fuse for the O2 sensor's heater circuit in the engine compartment. It may be worth a look to see if yours is OK. It probably is...


Dale

[rodeo02]

Originally Posted by 95.5 Rodeo

I didn't see anything written about the checking the fuse. My Rodeo has a fuse for the O2 sensor's heater circuit in the engine compartment. It may be worth a look to see if yours is OK. It probably is...


Dale

Hey good call! I'll check that out too.
Thanks
Joel

[rodeo02]

Checked the under-hood fuse for the O2 heater circuit. Fuse was ok. There's one 20A fuse for all 4 heated sensors, so I guess if you lost the fuse, you'd get a code for all 4 sensors. Merlin from St.Charles got back to me. The oxygen sensors for (the 2002 3.2L atleast) are part #8-97287-352-0, list price $136.69 each, cost with internet discount is $116.19. Per Merlin, all 4 sensors are exactly the same. New vehicles are getting to the point you wont be able to afford to drive them when they get old! $500 worth of O2 sensors ALONE on this truck. If you ever lost the "Y" pipe with cats & sensors, you'd be out a couple GRAND!

Joel

[rodeo02]

Has anybody tried the 'universal' cut/splice type oxygen sensors on a 1998+ 3.2L? Thru www.oxygensensors.com, you can cross-reference their 'walker' brand O2 sensors to a bosch 15730 universal sensor for the 2002 3.2L (you cant find a direct bosch p/n for the 2002 3.2L for some reason ). It's like half the price of a plug'n play unit. The "posi-lock" system the bosch universals have looks pretty good, as opposed to the crimp & heat shrink system most others have. I'm having a tough time coming up with an extra $110 this time of year . Any input would be appreciated!
Thanks all.
Joel

[Dober89]

Have you checked ebay for bosch o2 sensors?? Once in a while I have a look on ebay for rodeo items and several times I have see new bosch o2 sensors.