Cerious
Member
I lifted the hood and listened to my early 99 Jetta engine running for the first time in a while and was shocked at how much it was vibrating and it also seemed much noisier than usual. Took it to a mechanic and he found the front motor mount was broken and the driver side mount was weak. He replaced them but the vibration and noise problem isn't much better. I'm thinking that the vibration came first and caused an early failure of the motor mounts. Mileage has dropped from 55 miles per Imperial gallon to about 45. Car just passed 200,000 km. Have only used full synthetic oil designed for diesel engines. Power is good. Starts great. Engine light has been coming on but codes have been vague. Used to come on only during highway drives on hot days. Now it comes on in the winter. Engine noise seems regular (not missing). What are the most likely suspects for a car of this mileage.