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There are four oxygen sensors on your car. Do you know specifically which one you need to change?
The oxygen sensor are located on the exhaust manifold. The front two will be mounted right on the exhaust manifold on the left and right side of the car. The other two you will find from the bottom. Jack up the car and trace the exhaust back to the catalytic converter, the oxygen sensors are right after the catalytic converter.
2003 Jetta left rear window blue plastic part of the