any easy possible answers for why the check engine light is on? It says emissions
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2008 Volkswagen Jetta
Question: check engine light is on
Answer #1ZeeTech January 20, 2011, 17:01Master
The light cold be on for over thousand of different reason. You need to get a computer diagnostic to see what is causing the light being on, than repair it accordingly.
Answer #2vwzach May 16, 2012, 09:49Rookie
The light is coming on to tell you that the vehicle is storing a fault in the computer for something emissions related that is malfunctioning. You need to have the code read and that code will tell the tech where to begin diagnosing. It can come on for 200 different reasons.