TJ 2.4L O2 sensor

[mud4feet]

Figured y'all could help me out better than anyone else.......

Malfunction light came on this morning - P0132 - high voltage O2 sensor, bank 1 sensor 1. Have noticed that my mileage has been dropping lately (despite the acetone experiment), she sputters every now and then, and just noticed some black build-up on my tailpipe. Jeep's a 2003 2.4L with about 75K on it.

Am I correct in assuming this sensor is the one upstream from the cat? And is it time to replace it (no mention in the maintenance schedule and I haven't yet inspected it)? Getting ready for the bi-annual pilgrimage North and would really like to straighten this out first.

Thanx in advance to the Jeepz brain trust.

Mechanically challenged but poor,
mud

 

[dingus]

autozone will scan your jeep for free and sell u the sensor you need. Probably your cheapest route. You'll need a special socket for the sensor itself to get it out.

 

[mud4feet]

Well, I broke down and bought a sensor based on my un-confirmed assumption as to which one "bank one, sensor one" was (didn't need it scanned - my Jeep already did that). OE sensor (with plug attached) was $108 and not in stock. I bought the "universal" for about $60 and, after a little wire splicing (included a nice little splice kit, housing, and instructions), installed it and the light went off (BTW, a 7/8 inch wrench worked just fine......don't know how I would've gotten a socket in there - special or not). I guess I'll be finding out tomorrow if I did things right. I'm sure that I'll be replacing this thing sooner than I would have replaced the OE, but at the moment time and money are of the essence. Thanx for the help, Dingus.........I'll keep y'all posted.


PS.........anyone else wishing to do this, I would recommend NOT doing it as soon as you get home from work, laying on your back in a gravel driveway................let the exhaust cool down first!! OUCHIE!!!

 

[Sparky-Watts]

PS.........anyone else wishing to do this, I would recommend NOT doing it as soon as you get home from work, laying on your back in a gravel driveway................let the exhaust cool down first!! OUCHIE!!!

Ya big dope!! Sounds like a Sparky stunt!!



(best of luck on the rest of your pilgrimage)

 

[mud4feet]

Well, a little update (thanx to chuginsudz's post of the FSM).......seems I replaced the wrong sensor. Sensor1/Bank1 is inside the engine compartment, just down from the exhaust manifold.

So my question (oops...edit: questions), before I head to Advance Auto tomorrow..........what have I hurt putting an "upstream" O2 sensor in the "downstream" position?? Does the "downstream" sensor do anything more than just monitor the efficiency of the pre-cat??? Is the "upstream" sensor the only one that really affects performance?? Will it hurt me having 2 "upstream" sensors installed, or should I buy a "downstream" and switch them around (and have I done any damage to the previously-purchaced upstreamer??)??

Inquiring minds want to know

 

[Sparky-Watts]

Yes.