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Discussion Starter #1
My friends '05 Limited has been throwing the P0031 code for quite a while, causing the car to stumble a lot when coming off of an idle ( unless he floors it), so once again I'm elected to look into it sometime later this week. Lovely! :)

Is the wiring for the Gen3 sensor the same as for the Gen2? I have all the factory manuals for the Gen2, but nothing for the Gen3's.

Thankfully for him he works for Auto Zone, so he gets a decent discount on parts ( AND they carry the Denso sensors), and I already have the special socket, so that part of things are taken care of.

I'll look first at the connector and associated wiring, then check the voltage to the heater element and the heater element resistance. What should the resistance be for a "good" sensor?
 

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Discussion Starter #4
Being a 2.5 non-turbo, turbo, or H6, and FED or CA spec (they have different exhausts)?


Do you mean location of wiring, or schematic?
Plain jane 2.5 OB Limited, non-CA thankfully.

Schematic - need to know which wire is which to be able to put the meter on them.

I have new Denso sensors here that I bought for the '01 OB Limited, but haven't installed yet. Being that my friend is rather short on income (and still owes me for the last repairs!), I'm considering putting these in my '03 as preventive maintenance, and putting those used sensors into his car, assuming that they are the same - would save him a couple hundred $$.
 

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Look up the part number and see if it covers from 00-09. I doubt it will though. Use the correct parts the first time. There was someone on here who used random sensors off a Audi or something and was having problems, just because they look the same doesnt mean they are.
 

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Discussion Starter #6
Look up the part number and see if it covers from 00-09. I doubt it will though. Use the correct parts the first time. There was someone on here who used random sensors off a Audi or something and was having problems, just because they look the same doesnt mean they are.

Since my friend works at Auto Zone, I gave him that task to doublecheck the applications for the Denso sensors. With any luck, they will be the same for both generation cars, and if not, he'll just have to shell out for the correct ones for his car.
 

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Schematic - need to know which wire is which to be able to put the meter on them.
Attached page.

Terminal 6 is 12-14 V power from the main relay -- on when ignition switch is at ON.

Terminal 4 is the ECM heater control line (switching ground).

Terminals 1 and 3 are the sensor signal lines.

The connector B395 is 6 pin.

P0031 is often an open heater sensor, but there have been a few cases of problems with the bulkhead wiring harness.
 

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Discussion Starter #8
Thanks. The wiring will get checked first.
 

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Discussion Starter #9
Just f'n lovely.

After struggling to try to remove the front sensor ( which can't be done without dropping the exhaust from the engine to the wherever the next flange is)), we find out that there supposedly is a recall on these O2 sensors on almost all models from 2000 to 2015! So screw it, he'll now let the dealership deal with this problem! :)

For those interested, it is recall WXW-80.
 

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Discussion Starter #12
Sure it's WXW-80?

pdf download here https://testing-public.carmd.com/Tsb/Download/82732/011633-R doesn't include 2005. Do you have link to another source with different model years?
This is one of the links he found:


He'll call the dealer tomorrow sometime to verify it for his car, and get the work scheduled.

Edit; There is also this one that describes it, but seems to list a more restrictive year coverage:

 

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Discussion Starter #13
Ken finally went to the dealer, and even they couldn't remove the O2 sensor - massively tight, and they are afraid to put heat to the fitting for fear of destroying the cat.

Any advice on getting the sensor unscrewed without hurting the cat? I suppose that t may be possible to remove the cat and go at the sensor with a dremel to cut it out from the inside out, but there HAS to be a simpler way than that!

And how likely is it to hurt the cat if an acetylene torch is put on the nipple to heat it enough to break the sensor loose?
 

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Ken finally went to the dealer, and even they couldn't remove the O2 sensor - massively tight, and they are afraid to put heat to the fitting for fear of destroying the cat.

Any advice on getting the sensor unscrewed without hurting the cat? I suppose that t may be possible to remove the cat and go at the sensor with a dremel to cut it out from the inside out, but there HAS to be a simpler way than that!

And how likely is it to hurt the cat if an acetylene torch is put on the nipple to heat it enough to break the sensor loose?
You shouldnt need so much heat to damage the cat. It will be fine. Heat the fitting, not the sensor. You could even get a can of liquid nitrogen to spray the sensor, shrinking it. Also consider cats operate around 800*F.
 

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Discussion Starter #15
You shouldnt need so much heat to damage the cat. It will be fine. Heat the fitting, not the sensor. You could even get a can of liquid nitrogen to spray the sensor, shrinking it. Also consider cats operate around 800*F.
That's about what I was thinking - heat the fitting only, and keep wet rags on the thin shell that it is attached to (used to do that sort of thing a lot here in the shop when I was still building race cars) - that sort of contained heat really shouldn't affect anything else.
 
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