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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
    Registered User
    Join Date
    Aug 2014

    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
    Join Date
    Apr 2012
    not Ann Arbor
    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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