Some times it dosent show a fault or MIL light on, with the MAF sensor down. It could also be a lambda, shagged plugs, temp sensor, etc. Just too many things to start with replaceing part's that it could be. Some newer 1.4 and 1.6 also have a MAP sensor problems. Also, what type of car is it.
My emission light came on also recently and Im wondering if its the coil pack or l lambda sensor, if so are they covered under warranty? The car is not even 2 years old, its not running uneven or anything it makes a but of a whine on turnover but doesn't sound serious, (FSI engine). Im not driving it until I get it looked at anyhow.
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