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Old 08-30-2004, 03:57 PM   #1
MattDell
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Default Why would my rear O2 sensor go out after 1100 miles?

Got a CEL last week and I finally took my car in today to get it checked out. They said the rear O2 sensor needs replaced and they'd order it for me and call me when it comes in.


What would cause that?

-Matt
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Old 08-30-2004, 04:02 PM   #2
Unabomber
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Manufacturer error is probably the cause. O2s going south is actually quite common from what I have read here. Unless you have been running some leaded fuel, I would say it's just an error.
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Old 08-30-2004, 05:26 PM   #3
trustWRX
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Any mods?
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Old 08-30-2004, 05:38 PM   #4
Jard
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I'm getting a nice P0139. It just started after I flashed the Cobb Stage 2 91 Octane v1.19 map. I'm running catless. Wheeeeeeeeeeeeee!
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Old 08-30-2004, 08:22 PM   #5
MattDell
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Quote:
Originally Posted by trustWRX
Any mods?
Nope, bought it last week.


-Matt
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Old 08-30-2004, 08:33 PM   #6
hondaeater69
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prob just a bad 02 to begin with. Wouldn't worry bout it.
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Old 08-30-2004, 10:05 PM   #7
Jon [in CT]
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My theory about this is that the 2004 WRX ECU's tolerances have been programmed too tightly. There are umpteen instances reported where P0420 "fixes" have resulted in a P0139 DTC. There are nearly as many instances of folks without turbo back exhausts who've encountered this trouble code, too.

I predict an unannouced/undocumented factory "reflash" of the 2004+ ECU is imminent. I seriously doubt there's a systemic defect with the 2004+ rear O2 sensor on the 2004+ WRX.
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