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the engine dash light has come on and stays on, what is the cause on 2004 Volkswagen Jetta TDI

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
do not have a diagnostic code, but the engine picture on the dash has came on and has stayed on. Although my gas milage has dropped 4-5 miles per gallon, the car runs - starts fine. What is this light telling me and will the VW SHOP rip me off when the do the diagnostic test
(1) Answer
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A generic scanner will not always pull up the codes on a VW. You need to have the car scanned with VAG COM.