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My car is throwing a P1128 code. I have searched around and found this to be the MAF sensor. Car runs extremely rough when frist started for about 20-30 seconds after that everything is fine except a CEL and "Emissions Workshop" warning. I am sure someone else has had this problem. Did replacing the sensor shut off your check engine light? I have replaced the SAIP with one that had about 30k on it and also replaced the combi valve with a new one. None of the vaccuum lines look to be cracked or broke. Is there a way to test the MAF sensor before buying a new one? Also where is the best place to buy one at, couldnt find any one ebay. Thanks
 

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I have replaced my MAF on my ATW after getting the same code, and viola, a smooth running beast with no check engine light. Code cleared itself on next startup.
 

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To test it you have to run a flow test with a vag-com.
 
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