Sensor Code PO431 - Mitsubishi Forum - Mitsubishi Enthusiast Forums

Mitsubishi Endeavor This mid-sized sport utility vehicle offers a sporty look and excellent power, as well as a comfortable interior.

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Old 03-18-2009, 07:45 PM
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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
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Its you cat converter. O2 sensors never set those codes.
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Old 03-20-2009, 12:29 AM
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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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