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With the recent change in the weather my car has begun to throw a p0171 CEL(bank 1 lean). I only get the light when it is very cool in the mornings, around 40ish. After the second time I got the light I went through and checked all my vac. lines and made sure everything on my Corksport SRI was good and tight, but I still get the light. I also checked the plastic air diffuser in the intake and it was fine. Has anyone else had this problem or have any suggestions for something I may have missed.

It is an 11 MZ3 hatch 2.5. all that has been done to it is the SRI and a racing beat muffler. The car has had the mods since last summer(2011) and never had a code until now. Also only 11000 miles.
 

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It sounds like an air leak to me. I'd recheck all connections that you've touched. Also, check that the MAF is seated completely flat inside the housing. Also, might check the O-ring to see if there is a tear, that could cause a leak.

-Tyler
 
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