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: 162,527 (125,000–214,164)
Exhaust & Emissions affected: 2.0L 4 Cylinder
3 model years affected: 1997, 1998, 1999
11 people reported this problem
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problem details
1998 Volkswagen Jetta 141,000 mi,
Mechanic diagnosed the oxygen sensor as malfunctioning, but he cannot fix it. I have to take it to the dealer.
PO422,PO506 &PI582
1997 Volkswagen Jetta 180,000 mi,
I've had problems with both the oxygen sensor sometimes acts up and the temp always reads between 160 and 230.