Question about 2005 Volkswagen Jetta

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Nox sensor. What is it? How much does it cost to repair?

I am looking at buying a 2005 Jetta but the seller has told me that the check engine light is on. He said that the nox sensor is out. What is the purpose of this sensor and on average how much does it cost to repair it?

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Well, it could be either and oxygen sensor or a knock sensor.

Oxygen sensor monitors O2 levels in the exhaust.

The knock sensor listens for engine pinging and adjusts the timing as needed.

Prices vary on repair. I would recommend having the owner of the car either show you something from a repair shop that has the sensor name written, or take the car to a parts store that offers free code scanning and see what comes up.

Posted on May 13, 2009


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Hello ! As I bought my VW Golf Mk4 (model 2003) 1.6 FSI 16v few months ago, I have just realised there are some problems that need to be solved. First of all, the engine light came on and after computer...

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