How often does Jetta VA3 oxygen sensor change? Positioning and replacement process of Jetta VA3 oxygen sensor

202 1 Jetta VA3 usually has two oxygen sensors, namely the front oxygen sensor and the rear oxygen sensor. The former oxygen is located in front of the three-way catalytic converter, and the latter oxygen is located behind the three-way catalytic converter. See the figure below for the specific location.

Wipe the kettle

storage battery

Throttle (in the box at the top of the engine)

λ sensor

Fuse box

Coolant tank

The oxygen sensor works in a high temperature environment, so the car should be replaced after driving 654.38+ 10,000 kilometers. By observing the tip of the oxygen sensor, we can know whether the oxygen sensor needs to be replaced. If the tip is black (mainly carbon deposit), it is necessary to clean the oxygen sensor in time. Use 5- 10% ferric chloride solution containing excessive hydrochloric acid. And if the top is white or brown, it means that the oxygen sensor is poisoned. It's no use cleaning up at this time. Need to replace the new oxygen sensor in time.

Replacement process of Jetta VA3 oxygen sensor

1. First find the position of the oxygen sensor;

2. Remove the protective cover of the oxygen sensor plug and disconnect the oxygen sensor connector;

3. Clamp the hexagon nut of the oxygen sensor with a wrench, rotate it counterclockwise and remove it;

4. Restore in turn, and connect after installation and fastening;

5. Connect the trip computer, clear the fault code, and choose to read the engine data stream to check whether the value is normal.