I have a 2001 A6 2.7T. Only 60,000 miles. I have all 4 codes 1128,1130,1137, 1139. In looking up the codes it says the Fuel Air Metering is Lean and Rich.

What is causing these codes. MAF and or Oxygen Sensors or something else.

Thanks for the help

The MAF is probably the culprit, take it out and clean it with some electrical contact cleaner and clear the codes. Using a K&N filter can foul up the MAF sensor.

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