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Old 03-18-2009, 07:45 PM
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Join Date: Mar 2009
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Default Sensor Code PO431

I have a 2004 Mitsubishi Endeavor, I cannot get around the check engine light. I took it to Advance Auto and replaced an O2 sensor from the lower front bank, however the light came back on after about 30 miles. I returned to Advance Auto now they suggest it maybe the rear lower bank. Has anyone else had this occur and if so how did you resolve it?

I am also told it could my catalytic converter, Mitsubishi wants $1200.00 to replace it.

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Old 03-18-2009, 08:10 PM
dsm1990gsx's Avatar
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Join Date: Oct 2007
Location: Pottstown, Pa
Posts: 4,681

Its you cat converter. O2 sensors never set those codes.
2004 Ford Escape Xlt
2001 Mercury Sable
1990 Tsi Awd 12.8 @110 s16g @ 22lbs 2.0 60 ft.
-13.3 @114 holset hx35 @ 20lbs *needs new driver mod
1992 galant vr4
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Old 03-20-2009, 12:29 AM
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Join Date: May 2003
Location: United States
Posts: 1,187

why do people NOT have their problems diagnosed by people that know what they're talking about? (and im NOT talking about the morons at autozone).
take the car to the dealer and get it diagnosed/repaired correctly.
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