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Old 12-18-2012, 06:53 PM   #35
Sniper Focus
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What I Drive: '03 SVT EAP "Eurotrish"

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Quote:
Originally Posted by SD_Rider View Post
Why would the PO have a straight pipe and have the O2 sensors still in?
Well the upstream one is mandatory for A/F ratio. The downstream sensor is supposed to monitor the cat, since there isn't one you'll need a MIL eliminator, a tune, or a drilled out spark plug non-fouler to get rid of the P0420 code.
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