mlepesant

Hello all and Happy Holidays,

I do have a P0132 for upstream O2 sensor. A little background first...

XJ 98 sport, 308k miles, all stock. I just changed the freeze plugs on the side of the block for brass ones, so removed intake/exhaust manifolds (change gasket). Did the RMS, and the front crankshaft seal.
After I was done it started right up. I drove about 2 miles and the code appeared. I cleared it and it came back after another 2 or 3 miles. The jeep starts well, drives well, at any speed. No hesitation.
In the process of changing the freeze plugs some coolant poured over the connectors for the O2 sensor (the one on the downpipe). I am not sure it actually hit the contacts but I cleaned the connectors with electric cleaner, and sprayed diaelectric grease,
I checked the fuse (or the one I believe to be the fuse for the O2 sensor - 15amp, first row, second column starting from the fender side) and it is not blown. Is there another one to check? Is there only one fuse for the O2 sensors? And is there also a relay? Tomorrow I'll inspect the wiring for the sensor. Besides that what else should I check before replacing the sensor? Would a poor connection between the exhaust and the downpipe cause this issue? Am asking because I was not comfortable with the way I reconnected the exhaust manifold and the downpipe. IDK.. didn't seem very tight.
Anyway, I appreciate your suggestions before I run to the store and spend the money on the sensor.
Marc

KD4315

Have you tightened down the exhaust manifold bolts since driving it? I recently did my exhaust manifold and had to re-tighten them after driving for a while.

mlepesant

No I haven't yet. I can try that tomorrow. You think that would need to be done so early?
Thank you.

salad

P0132 is a high voltage code, if the sensor isn't bad I'd start looking for shorts.

mlepesant

By inspecting the wiring of the sensor?

tjwalker

I agree with Salad; this particular code is usually caused by the sensor itself or wiring.

1. Inspect wiring.

2. Oxygen sensors have a finite lifespan and are not really that expensive. Replace it with an NTK sensor. Widely available.

mlepesant

Thank you. Wiring looks ok from what I can tell. Got an NTK. Will put in tomorrow and give update.

mlepesant

Well, I'm an idiot.. Sensor and wires were fine. Connector clip was broken so I had actually hooked it up 180 degrees off.. Plugged it in correctly and all is good.
Sorry for the waste of time.

salad

Heeey well flipped connector works too! Glad you fixed it. No waste of time here! The important thing is to get out and LOOK!

tjwalker

Agreed......easy fix. And thanks for updating us, as many do NOT.

mlepesant

Well, with all the help I am getting out of you guys, that's the least I can do. Although the fix was "basic", it may help somebody who could do the same thing.