Check Engine Light Due to Oxygen and/or Coolant Temperature Sensor Fault on Volkswagen Jetta

The Check Engine Light may illuminate as a result of a oxygen sensor and coolant temperature sensor fail. Replacement if the failed part will be necessary to correct this issue.

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Average mileage: 101,136 (40,000–168,952)
Exhaust & Emissions affected: 2.0L 4 Cylinder
3 model years affected: 1993, 2004, 2005
11 people reported this problem
5 people shared problem details
2005 Volkswagen Jetta101,000
Replaced thermostat
2004 Volkswagen Jetta168,952
All of sudden while driving my check engine icon lit up. Had a dealership run the code and was a bad O2 sensor. Haven't replaced it yet since I am not too concerned due to it being only an emissions issue however I have noticed about a 30% decrease in my fuel economy since the O2 sensor failed. I was quoted that the repair will run me around $200 - $250 including labor.
2004 Volkswagen Jetta130,000
engine light came on and ended up being a coolant issue and was the themostate.
Temp Sensor failed, which made the engine light to go off. VW quoted me at around $600. Got it repaired at a private auto shop for less than $200 (if I remember correctly).
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