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AUDI 2012 A4 CODE P2187 REPAIR SUGGESTIONS?

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I keep getting code P2187 I have reset it and it comes back. Any suggestions for repair?

Vehicle: 2012 AUDI A4 2.0

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P2187 System too lean at idle

Intake air system leak , look for air leak at the MAF air duct , loose oil cap or missing oil cap seal.

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