Question about 2002 Mitsubishi Galant

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I have check engine light on and whe i checked the code is p4029

Posted by muhammadd254 on

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  • Anonymous Oct 19, 2012

    PO ---what? 402

  • muhammadd254
    muhammadd254 Oct 19, 2012

    Sorry thats P0429

  • Anonymous Oct 19, 2012

    I can't find PO 429 Not a Generic Code must be specific to your brand car may be a failed exhaust converter,the code is in that area as far as numbers go



1 Answer

Wes Roberts

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P0429 Description The Engine Control Module (ECM) monitors the switching frequency ratio of heated oxygen sensors 1 (front O2 sensor) and heated oxygen sensors 2 (rear O2 sensor).

A three way catalyst converter (Manifold) with high oxygen storage capacity will indicate a low switching frequency of heated oxygen sensor 2. As oxygen storage capacity decreases, the heated oxygen sensor 2 switching frequency will increase.

When the frequency ratio of heated oxygen sensors 1 and 2 approaches a specified limit value, the three way catalyst malfunction is diagnosed.
Possible causes - Catalyst Heater Control harness is open or shorted
- Catalyst Heater Control circuit poor electrical connection
- Faulty Powertrain Control Module

Posted on Oct 20, 2012


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