Your code is Long Term Fuel Trim Multipicative System Too Lean. Check for vacuum hoses loose, intake gaskets. ALso need to check for o2 sensors not working correctly. Exhaust pipe leakes.. I know especially the flex pipe just before the 2nd o2 sensor. The Flex pipe likes to break. Then the oxygen sensor thinks it's lean..
Changed the mass senser as dealers recomdation,hasnt fixed my car yet still bad gas mileage,cars tail pipe is really black ,thanks will check some more
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