Zedhead21 Posted August 2, 2017 Share Posted August 2, 2017 I'm getting a check engine light and a P1273 fault code on my 04 350z , it's got berk high flow cats , rev up map , pop charger intake filter and scorpion cat back , I'm guessing it's due to an o2 sensor as the exhaust seems to be popping a bit more lately and I'm gettting slightly worse mpg so makes me think it's running a bit rich , need to sort it before the mot as I doubt it will pass emissions like this , anyone got any suggestions where to start ? Thanks Quote Link to comment Share on other sites More sharing options...
Zedhead21 Posted August 2, 2017 Author Share Posted August 2, 2017 For anyone else having this problem , it turns out I'd left the bottom vacuum pipe of the bottom of my air intake pipe from the filter to the throttle body from where I'd removed it to get at the spark plugs previously Quote Link to comment Share on other sites More sharing options...
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