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: 94,658 (40,000–168,952)
Exhaust & Emissions affected: 2.0L 4 Cylinder
3 model years affected: 1993, 2004, 2005
10 people reported this problem
5 people shared problem details
2005 Volkswagen Jetta101,000
1 person likes thisFlag inappropiate
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).
Related Items:
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.
Oxygen sensor and coolant temperature sensor failures are common.
...y symptoms—including hard starting—can be caused by coolant temperature sensor and oxygen sensor faults.
i have a po112 code showing need to know what it is and were it is .

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