UP PIPE CEL FIX help!
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This is a discussion on UP PIPE CEL FIX help! within the Engine Modifications forums, part of the Tech & Modifying & General Repairs category; So i want to get a grimspeed up pipe but ive heard that WRX's need to have 2 CEL fixes. ...

  1. #1
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    Post UP PIPE CEL FIX help!

    So i want to get a grimspeed up pipe but ive heard that WRX's need to have 2 CEL fixes. 1st Fix CEL code P0546 = Exhaust Gas Temperature Sensor Circuit Malfunction (High Input) with a 2.2k 1/2 watt resistor to the EGT connector. How would you be able to be the other is rear CEL code P0420 Catalyst System Efficiency Below Threshold. I dont want CEL, i want 2 for 2! and fix both.

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  3. #2
    Registered User Obeisance's Avatar
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    As it turns out, switching the uppipe doesn't throw the P0420, so you've got nothing to worry about there. That code is for the rear cat.
    David - '05 WRX

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