Check Engine Light on, Multiple Possibilities on Volkswagen Jetta

Problem Description and Possible Solution

The Check Engine Light may illuminate due to a faulty oxygen sensor and/or coolant temperature sensor. Proper diagnoses will be required to confirm the fault.

Problem Data
RepairPal Verified
Average mileage: 162,527 (125,000–214,164)
Exhaust & Emissions affected: 2.0L 4 Cylinder
3 model years affected: 1997, 1998, 1999
18 people reported this problem
Viewing 1 - 4 of 4 comments
Mechanic diagnosed the oxygen sensor as malfunctioning, but he cannot fix it. I have to take it to the dealer.
I've had problems with both the oxygen sensor sometimes acts up and the temp always reads between 160 and 230.