One problem related to emission control has been reported for the 1998 Volkswagen Jetta. The most recently reported issues are listed below.
Like others, I have had the ignition coil replaced. This happened after the warranty expired, of course. I have also had electrical problems with the windows (regulator and motor) for all of them. Now, my check engine light is flashing and the car is sputtering. I know the secondary air intake valve needs replacing but it did not cause problems. Now I'm wondering if something new is wrong??? also, I was having problems with losing coolant and had to continuously replace antifreeze. After fixing what I thought was a small leak the entire system will not produce cool air! this car has been nothing but problems and vw should look into all of these complaints.