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I just got my car back after being in the shop for 4 months I had blown up the original engine with a turbo. I went compleatly back to stock and im still haveing the check engine light pop on. It keeps telling me that my system idel is too lean. This make no sence to me. The car doesnt run rough or make nose or anything. Does any one know y i might be getting this error code?
 

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its possible that you have a vacuum leak somewhere on the air intake system, on the motor side of the maf sensor, or ive also seen a case where a car i was working on ended up needing an air/fuel ratio sensor-not a mazda
 
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