O2 sensor
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This is a discussion on O2 sensor within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; I have an 05 wrx with a full turboback exhaust. It has a catless up pipe and a catless down ...

  1. #1
    Registered User Red_Dragon's Avatar
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    O2 sensor

    I have an 05 wrx with a full turboback exhaust. It has a catless up pipe and a catless down pipe. I have a spacer on my O2 sensor so I don't have any CELS. I mainly did this because of emissions. I was considering removing the spacer when I install my accessport. Just wondering if anyone else has done this and would it hurt to leave the spacer on? Being that The only cat I have is the small one in the aftermarket exhaust behind the O2 sensor I assume it will throw a CEL and when I get it inspected I will need to replace the spacer.

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  3. #2
    Moderator Donkey's Avatar
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    You can ditch the spacer once you flash the map from the AP.It changes the rear O2 sensor values and takes care of the DTC's associated with causing a CEL.Should be in Cobb's map notes......
    Resident Adviser @ WTF Tuning, LLC
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  4. #3
    Registered User Red_Dragon's Avatar
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    That's kinda what I was thinking, but I wanted to be sure. I didn't want to fail emissions and then have them actually look at my exhaust and realize its missing a cat.

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