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I've had this code (P0171) come up twice now in the last two weeks, can't seem to figure out the problem. I've read that it can be from a dirty MAF sensor or a leak somewhere in my exhaust or intake. I've got a K&N Typhoon intake and Invidia turbo back exaust, im running a stage two 93 octane low waste gate tune, btw it's a 2005 STI.. Any help on what the problem is or how to solve it will be greatly appreciate
 

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