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
the engine dash light has come on and stays on, what is the cause on 2004 Volkswagen Jetta TDI
by Jetta TDI in Wagner, SD on August 26, 2010
ANSWER by goodguysdiesel , February 09, 2011
A generic scanner will not always pull up the codes on a VW. You need to have the car scanned with VAG COM.