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Bassett99TJ 05-02-2011 11:56 PM

O2 Sensor Purgatory
Have a serious O2 sensor problem with my TJ..Love it, but considering getting rid of it because I can not fix my problem which is draining my cash plus rendering my Jeep either in the shop or in the garage, I am missing important trail time. The o2 sensors keep going bad. I have been getting codes P0132, P0135, P0138, and P0141. What happens is the Jeep will run fine, but when ideling, or first starting off, or coasting (mainly coasting, like when going down hill for a long time) jeep starts to chug bad and throttle is hit and miss on response. First time I took it in they replaced the o2 sensors..then it happened again, took it back, they noticed the previous owner had put a straight pipe in lieu of a cat conv, so they put in the cat, retuned it, good for a few days. Then back to same issue. Then they suspected that the previous shop put in wrong sensors, so they got that shop to replace the sensors free of charge, good for 2 days, then boom, back to square one. I am about to take it to the jeep dealership in hopes they can fix it. All i want is to get this thing running good. I am starting to worry I have an electrical problem and will be chasing this foerever. maybe better to buy a newer rig with less issues? Maybe the shop I am going to is clueless? Let me know if you have any thoughts. :surrender:

I am in Tucson, So if any Tucson guys know someone that can fix it let me know.

Black98 05-03-2011 03:00 AM

sounds to me like a Throttle positioning sensor more than an 02 sensor. I would also get all your money back if they keep failing to properly fix the problem and waste your time.

Bassett99TJ 05-03-2011 11:21 AM

Maybe so, but then why am I getting the P0132, P0135, P0138, and P0141 codes.

POS YJ 05-03-2011 11:45 AM

A "good" shop will be able to hook up their scan tool and read the real time readings of all of your sensors, not just look at the codes and throw parts at it. Most of the time if you get an O2 code, then the O2 sensor will fix it, but there are other things that can cause the O2 sensor to give a false signal. Also, I have helped several people with check engine lights by just giving the vehicles plugs, wires, fuel filter, PCV valve etc. Doing this first is usually cheaper than paying for an hour of diagnostics at a shop. Just something to think about.

herbie 05-03-2011 11:14 PM

generaly the two biggest things that screw up 02 sensors readings are either an exhaust manifold leak allowing it to draw in extra air from a gasket or even a crack and use of rtv sealant

Bassett99TJ 05-03-2011 11:31 PM

What is the deal with the RTV Sealant

sfort 05-03-2011 11:53 PM

I don't think they have done anything to help. They are installing parts on your jeep and resetting the computer that starts from square one again. Than you get the codes again because they did not fix anything. Find a good shop and I am not saying that is a dealership. Post a location and maybe someone here can recommend a good shop.

NickT 05-04-2011 12:34 AM

I had a recurring O2 sensor, TPS Cam PS and so on with a cyl #1 miss. turned out it was the fuel pum. Once I changed it all was well. Ran rough on start then cleared up in less than a minute and ran fine. Dealer charged me $125 to tell me they thought it was a fuel pump or ignition rail. Good Luck

Bassett99TJ 05-04-2011 10:31 AM

I had a post a while back asking if anyone had a good trusted mechanic in Tucson AZ. I didnt get any response. Anyone from the Tucson AZ know of anyone good? Let me know.

sfort 05-04-2011 08:58 PM

Go to the <> forum and ask the same question in the engine section under Moper.

01WranglerGuy 05-04-2011 10:24 PM

do you have an aftermarket pcm (chip)?

Bassett99TJ 05-04-2011 11:26 PM

I do not have an aftermarket pcm chip that I know of.

herbie 05-05-2011 02:01 AM


Originally Posted by Bassett99TJ (Post 1218326)
What is the deal with the RTV Sealant

dont know if things have changed in the last 20 yrs with silicone but ive read tsb bulletins where useing rtv silicone on intake and exhaust systems would cause the 02 sensor to be covered with a film that caused degredation of the sensor

rrich 05-05-2011 03:02 AM

Don't use RTV!

All 4 codes are essentially saying the same thing - Bank 1, O2 heater circuit.

Bank 1 is the exhaust system where cyl #1 is - the front part (3 cyls feed it.)

One code is for the sensor ahead of the cat, the other is for the one behind the cat - both on bank 1.

Measure the +12 volts to the sensors. Use a digital voltmeter only. Don't use an analog type meter - the kind with a needle. Using an analog can and will fry the O2 sensor.
You should find 12 volts to the sensor.
If not, look for a break in the harness. If OK, check ALL the fuses under the dash.

It should be simple to find.

Bassett99TJ 05-05-2011 05:22 PM


Thank you for the helpfull tip. Can you help me with where I need to measure the voltage at?

rrich 05-05-2011 05:37 PM

Take off the connector to the O2 sensor(s.) Engine off, key on.

One of the 3 or 4 wires will have 12 volts on it - or should.
If not, find out why - wiring, fuses etc.

Sledneck 06-19-2011 11:23 PM

Did you ever find out what was causing the problem? I'm having the exact same issue

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