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The oxygen sensor is more commonly known as a lambda sensor at it monitors the amount of oxygen in the exhaust gasses going through the exhaust, the Mass air flow meter monitors the incoming air coming through the air intake before it enters the engine.

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Q: What is the difference between an Oxygen Sensor and a Mass Air flow Sensor in a 2001 VW Jetta?
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Where is the oxygen sensor on a 1985 VW Jetta?

In the exhaust manifold.


Where is the oxygen sensor on a 1986 Jetta?

I had a 1987 Jetta and the oxygen sensor was connected to the down pipe. It is screwed in and there should be a wire leading from it. From the engine compartment you can look near the firewall and follow the exhaust pipes. It should be sticking out midway between the top and bottom bends.


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How many oxygen sensors are on the 2006 Volkswagen Jetta?

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