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Don’t throw away the OEM. Buy CRC MAF Cleaner and you’ll probably get it back on track. Mine was doing the same and after cleaning it the problem dissapeared. The reason you got a code was more likely you disconnected the maf sensor with the car running. Not necessarilly because it was faulty
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BMW X5 2002 4.4i V8 - What a headache!!! 
BMW X5 2019 XLine 3.0D - Loving it
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