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snapontech, Technician
Category: Audi
Satisfied Customers: 3803
Experience:  2 Year Automotive Degree Custom Tuning and experience with Audi and all of VAG motors
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Audi a4 s line my emission control system warning light has

Customer Question

my emission control system warning light has came on on my audi a4 s line avant auto/tiptronic. since it has been on my car sometimes doesn't accelerate as it should. the rev counter goes up but the car sometimes doesn't seem to change gear. what is the problem?
Submitted: 5 years ago.
Category: Audi
Expert:  snapontech replied 5 years ago.
Welcome to Justanswer, My name is Danny I am here to help.

What does the image of the icon look like on the dash?
Customer: replied 5 years ago.
an engine.
Expert:  snapontech replied 5 years ago.
The vehicle is in limp home mode that is why its not responding or shifting properly. This can be a wide range of things anywhere from a bad speed sensor to a bad throttle body. You need to have the engine codes pulled from the computer using a VAG COM scanner to the OBD port this will tell you what caused the error and than you can fix it properly. You can reset the codes which will remove it from limp home mode by disconnecting the battery pos and neg for 5 minutes touch them together before reconnecting the cables to the battery than its reset but if the problem is not fixed there is a good chance it will come right back on but you could try this if you need to get it to the shop and cant make it in limp mode. Thanks

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