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Old 08-19-2003, 09:06 PM   #1
norseone
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Default Cel 1131

Anyone know what it corresponds to?
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Old 08-19-2003, 09:09 PM   #2
Mulder
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P1131
Front oxygen sensor circuit malfunction (short circuit)
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Old 08-19-2003, 09:14 PM   #3
norseone
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THanks Mulder. Do you know where its located? And whether or not extensive mods could cause it to fail?
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Old 08-19-2003, 09:31 PM   #4
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The front 02 sensor is located in the manifold, but the problem could be either with the sensor itself or the wiring. The 4-wire harness from the sensor goes up to an inline connector which is under the black cover where the boost solenoid is, there is also a two-wire connector there which is the EGT sensor.
It's possible that in the course of working on the car you might have damaged the sensor or its wiring. A visual inspection may turn up the cause.
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Old 08-19-2003, 09:45 PM   #5
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Wires look fine. No cutting or anything like that. So I am thinking it must be the sensor. Do you think its okay to drive the car?

You think the dealer would say its my fault the 02 sensor went south? Due to extesnsive mods. How long are they supposed to last? I only have 28K on my car.

EDIT: After looking a little more, I checked the wires all the way to the sensor and something is not right. There is what looks like a burn hole in the rubber coating of the sensor wires. But from my point of view it looks like the wires are still intact. I guess I gotta repair them or just get a new harness.

I will try and snap a pic when I get my hands on a carmera.

DREW

Last edited by norseone; 08-19-2003 at 09:55 PM.
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Old 08-19-2003, 09:57 PM   #6
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The emission components, including the 02 sensor, are covered by a separate 80K/8yr. warranty. Whether or not it would be covered in your case depends highly on the particular dealer you take it to, some are "mod friendly" and some are not.
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Old 08-19-2003, 10:11 PM   #7
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02 plug I guess this thing is real fragile. I have no idea how the wire got cut in the 1st pic. I dont know how the protective rubber got burned off in the 2nd pic either. Weird. But I wonder what my dealer is going to say.



And the wires going to the 02 sensor.


Last edited by norseone; 08-19-2003 at 10:20 PM.
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Old 08-19-2003, 10:22 PM   #8
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The exposed wire isn't good but appears like it isn't completely broken. The second pic is a bit fuzzy but from the looks of it the wires may well have burned through and shorted. You can try to open the harness and repair it, but it probably won't hold up due to its proximity to the hot exhaust and exposure to the elements. The outer jacket is heat resistant but can't take direct contact with the exhaust which is probably what happened. Once it's been damaged the heat protection is gone. The best solution is to replace the sensor although it will be at your expense and they aren't cheap. Next time be sure to watch where the wires are routed and keep them as far from the exhaust as possible.
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Old 08-19-2003, 10:39 PM   #9
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Yeah the harness wire I will just tape up. The wires dont look as though they have been burned through. At least from what I can tell. I will get a better pic tomorrow, Itook these with a digital camera.

If I were to replace the sensor dont I need to replace the wires as well? I am assuming the wires come with the sensor??

Thanks for your help my man.
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Old 08-19-2003, 10:44 PM   #10
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The sensor comes as an assembly with the wire harness and connector which plugs into the mating one under the cover.
If you have an ohmeter you can check the continuity between the wires. The two white wires are the heater and should show some reading in the tens or hundreds of ohms, but should not be zero. The other wires should be open, if you read a low or zero resistance on them that's bad.
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Old 08-19-2003, 10:58 PM   #11
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There should be four wires running into that connector from the front A/F sensor, but I only see three in the first (top) picture. I'm pretty sure you won't be able to just "tape it up" and expect it to work.

BTW, that doesn't appear to be a US WRX front A/F sensor connector. What year and model is this?
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Old 08-19-2003, 11:50 PM   #12
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Quote:
Originally posted by Jon [in CT]
There should be four wires running into that connector from the front A/F sensor, but I only see three in the first (top) picture. I'm pretty sure you won't be able to just "tape it up" and expect it to work.

BTW, that doesn't appear to be a US WRX front A/F sensor connector. What year and model is this?
There are 4 wires, you just cannot see the other one. The copper is exposed but not cut. And I am not even sure that is the problem. The 2nd picture can also be where the problem is, it could aslo be the O2 sensor. I dont know. I am just going to replace the sensor and tape up the harness and see what happens.

It is a MY02 WRX.

Mulder I dont have an OHM tester, but I might just buy one. When you say open, what should I see on the ohmeter tester if the wire is open?
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Old 08-20-2003, 07:18 AM   #13
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If there is an open connection between two wires, or an extremely high resistance, the ohmeter will not read or will show infinite ohms depending on the particular meter, or it might show a very high reading in the hundreds of thousands or megohms (due to some leakage). In your case though you are looking for a short, or very low resistance where there shouldn't be. When resistance-testing wires don't touch them with your fingers as it will affect the readings due to the conductivity of your skin.
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Old 08-21-2003, 12:02 PM   #14
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did the insulation melt due to external heat or did the wires get hot?
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Old 08-21-2003, 03:10 PM   #15
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Quote:
Originally posted by rick-l
did the insulation melt due to external heat or did the wires get hot?
It must have been resting against the exhaust manifold, it is defiantly burned on the outside.

DREW
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