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It's means what it says,you emissions are malfunctioning ,and could be caused by a number of things,you will to read the fault codes and you should have some idea as where to start ,and remember that a fault code may or may not mention a certain sensor, valve,or emission part that may or may not be bad,like a vacuum part will not show up because it is not electrical, but another valve that it supply's vacuum to that is electrical may show up as the problem,the fault code will let you know what is not working properly ,it will be up to you to find out why it is not working properly,it may be another valve or sensor that is bad and not allowing the electrical part to work

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Q: What does it mean when the emissions malfunction lamp goes on in a jetta?
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