Quote:
Originally Posted by weederr33
I just got the check engine and SL light. Threw P0171 and C1201 codes. Any help please?
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I just noticed your car is modded, P0171 comes with an intake leak or exhaust leak in the flange so I would check there as well as make sure the O2 sensors are working properly. If it's an exhaust leak it's gonna be from the engine block to the flange of the header, might need a grimmspeed exhaust gasket upgrade?
If it's an intake issue which seems more likely with the supercharger, I would check all the intake pipes any loose hose clamp will leak air and then cause the maf to go full shit mode and think it's running lean
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