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Mustang Forums
2011-2014 Mustangs
Engine/Tuning
Rear o2 sensor ODBII readiness for passing emissions
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<blockquote data-quote="fuelforfire87" data-source="post: 16469357" data-attributes="member: 172024"><p>I passed emissions 2 years ago using a catted x-pipe and the o2 spacers. The reason why you need the spacers is because if you don't use them you will still get CEL's P0420 and P0430 for cat inefficiency because the high flow cats are less restrictive than the OEM cats. I just thought after 100 miles or so everything would be set. I will follow the ford drive cycle procedure that Mojo88 posted to see if that will help them set.</p></blockquote><p></p>
[QUOTE="fuelforfire87, post: 16469357, member: 172024"] I passed emissions 2 years ago using a catted x-pipe and the o2 spacers. The reason why you need the spacers is because if you don't use them you will still get CEL's P0420 and P0430 for cat inefficiency because the high flow cats are less restrictive than the OEM cats. I just thought after 100 miles or so everything would be set. I will follow the ford drive cycle procedure that Mojo88 posted to see if that will help them set. [/QUOTE]
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2011-2014 Mustangs
Engine/Tuning
Rear o2 sensor ODBII readiness for passing emissions
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