Check Engine Light help- Running Lean?

YUNG VEEZU

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My check engine light has been on for sometime, the previous owner had an off road mid pipe on the car but since I had to smog it I switched it back to the stock mid pipe. I've had my Cobra for about a month now and 2000 miles later the light popped on and I've pulled up four codes - PO171 twice and PO174 twice.

My buddy told me I may have an issue with my MAF and O2 sensors. I've already used MAF cleaner and carefully cleaned the MAF sensor, so far the check engine light still comes on after a few miles. Any help would be appreciated
 

turion94

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You probably just need some new O2 Sensors. My car did the same thing and gave me the same codes. Pay the extra money and get OEM Sensors from Ford. It only takes about 15 minutes to install. Screw them in the pipe and plug them in. I replaced mine and Problem fixed.
 

vermilion

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bank 1 passenger side DTCs.
check for:
*vacuum leak
*exhaust leak
*manifold(s) gasket
*cracked intake.
 

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