Do I really need a new Cat? - Nissan Xterra Forum
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post #1 of 20 Old 11-21-2016, 03:56 PM Thread Starter
ziggieice
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Do I really need a new Cat?

Some back story, I have a 2004 non supercharged 2-wheel drive xterra w 159k miles. A few months ago I was getting some really bad mpg and my SES came on, I got it scanned and my engine bay 02 sensors were tripped as well as the ones near the catalytic converter and a fuel level sensor that comes and goes?:

p0132 Air fuel ratio sensor 1 circuit high voltage
p0152 Air fuel ratio sensor 1 (Bank2) circuit high voltage
p0138 heated oxygen sensor 2 circuit high voltage
p0462 fuel level sensor circuit low input

The recommended part was engine wiring harness?
Well I did the trick where you would clean the ground strap washer and bolt for the engine bay's 02 sensors I had to actually relocate one of them as well as change the nut and washer because the original location was so badly rusted.
now I cant clear my codes as I dont have a scanner only a autozone readout but My SES turned off on it's own after about 200 miles of me doing that and has stayed off for about 160 miles after that but came back on and now I have p0430 catalyst system efficiency below threshold (bank 2) this is the only code with the previous still in memory
I assume that my 02 sensors are actually bad and the grounding wasn't an issue and me running lean for so long and putting up with the terrible gas mileage caused my cat to die OR I really did need to clear the codes so that my car can readjust itself to quit running lean. Is it true that the fuel level sensor can trip the cat's code, are there any work arounds? I will continue to do more research on this but I'm weary on buying a new cat. ANY incite is really appreciated!
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post #2 of 20 Old 11-26-2016, 05:16 PM Thread Starter
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The search continues

I still have no idea what to do whether I need a new wiring harness or new o2 sensors, I have 2 new sensors and my mechanic will install them soon. Fuse 14 is ok also, all fuses are ok in fact.
I still have symptoms of bad o2 sensors though like the rough idle and terrible gas mileage but the on;y code is for the the cat.
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post #3 of 20 Old 11-26-2016, 09:09 PM
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I had similar codes on a few months back. I have an 02 with 197K

First I replaced the O2 sensors and that didn't fix it. Then I replaced the wiring harness. Problem fixed.
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post #4 of 20 Old 11-27-2016, 02:50 AM Thread Starter
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Jeez, I was afraid of this, did you happen to find where the fault was with your old wiring harness? Could you tell me how much you paid and where you got your new one?
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post #5 of 20 Old 11-27-2016, 11:57 AM
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The place where the wiring harness connects to the engine corrodes over time. The mechanic got a new one and cleaned up the connection point for a better connection. Can't remember what I paid and I don't remember the breakdown because I had other work at the same time. Besides, in a different market, there are different prices.

You might be able to find the connection point yourself and try just cleaning the corrosion off. Maybe you can fix this yourself for free.
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post #6 of 20 Old 11-27-2016, 12:16 PM Thread Starter
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Quote:
Originally Posted by GrnXnham View Post
The place where the wiring harness connects to the engine corrodes over time. The mechanic got a new one and cleaned up the connection point for a better connection. Can't remember what I paid and I don't remember the breakdown because I had other work at the same time. Besides, in a different market, there are different prices.

You might be able to find the connection point yourself and try just cleaning the corrosion off. Maybe you can fix this yourself for free.
Well the wiring harness connects to the engine in a lot of different places, I assume I need to follow the leads for the 02 sensors?
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post #7 of 20 Old 12-20-2016, 12:49 PM Thread Starter
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I still need to find where exactly I need to look to see if there is corrosion before I drop money on a wiring harness, does anybody know where GrnXnham is talking about?
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post #8 of 20 Old 01-11-2017, 01:19 PM Thread Starter
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Still looking for answers, anybody?
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post #9 of 20 Old 01-11-2017, 04:58 PM
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Any sign of exhaust leakage on the manifolds?

2000 Frontier XE CC (4x4 parts lift, Eaton rear locker, 4x4 parts skid plate, BFG KO2s, Calmini sliders and bumper, Warn winch, Warn hubs, DT headers & full exh., lots of scratches and dents)
2011 Honda CRZ (stock)
2013 Ducati Hyperstrada (stock)
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post #10 of 20 Old 01-12-2017, 04:36 AM Thread Starter
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No, none
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2004 xterra , catalytic converter , fuel level sensor , oxygen sensor , wire harness

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