Quote:
Originally Posted by EquiFox
I have P0171 too, I thought my CEL was related to my Borla UEL that we just installed, but no.
Must be my intake tho... I know running lean is not great at all, but can I do a 2h drive without issue (long term too) ??
I need to get it tuned, that's where I'm going, but it's 2h from here.
Thanks
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Catless headers will cause P0420 cat efficiency cel code.
P0171 is generally a problem with the MAF sensor ie dirty oily of you have oiled filter or air leak in intake. But it can also be caused by exhaust gasket leaks near the 02 sensors letting in fresh air and making the 02 sensor think the car is running lean. Or damaged 02 sensors or o2 sensors not installed correctly/cross threaded loose ect.
Always use new gaskets when installing headers the old ones will always leak if re-used.
I would not drive my car 2 hours with those cel codes active but it up to you.