Check Engine Light on, Multiple Possibilities on Volkswagen Jetta

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.

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Average mileage: 152,200 (125,000–180,000)
Exhaust & Emissions affected: 2.0L 4 Cylinder
3 model years affected: 1997, 1998, 1999
10 people reported this problem
3 people shared problem details
1997 Volkswagen Jetta180,000
I've had problems with both the oxygen sensor sometimes acts up and the temp always reads between 160 and 230.
1998 Volkswagen Jetta141,000
Mechanic diagnosed the oxygen sensor as malfunctioning, but he cannot fix it. I have to take it to the dealer.
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