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After installing 2 new Bosch MAF's I got a P0175 code on first start up. I cleared the code and it didnt come back. Should I just put my old MAFs back in? They're a lot older and dirty than the new ones.
 

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Just wait. The car is telling you it made a big adjustment to the trims because it finally had the correct reading. What you saw was normal and expected and means things are working correctly.
 

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I just put new MAFs in my Z8 and experienced the same issue. I cleared the code and disconnected the battery for a few minutes. No problem since.
 
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