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Volkswagen Polo Service & Repair Manual: 4-Pin Heated Oxygen Sensor (HO2S), Removing and Installing

Volkswagen Polo Service & Repair Manual / Wiring / Heated Oxygen Sensor, Replacing / 4-Pin Heated Oxygen Sensor (HO2S), Removing and Installing

  Note
Do not repair the heated oxygen sensor wires. Repairing may result in malfunctions.
Use the faulty sensor as a guide for installing all of the accompanying attachments, cable ties or marking bands.
If necessary, identify the heated oxygen sensor (HO2S) using the protective tube. Refer to → Chapter „Oxygen Sensor Unit Protective Pipes“.
–  Remove the faulty oxygen sensor.
   
–  Lay both of the oxygen sensor next to each other so the sensor housings are the same level.
 

4-Pin Heated Oxygen Sensor (HO2S), Removing and Installing

–  Tie the excess length of the sensor (approximately 50 to 250 mm) back so it is the same length as the faulty sensor and secure it with cable ties -1-.
–  Check if the oxygen sensor connector housing is compatible with the vehicle electrical system side.
–  If necessary, replace the vehicle electrical system connector with the provided oxygen sensor connector housing. Refer to → Chapter „Contact Housings and Connectors, Repairing“.
  Note
Only replace the connector housing on older vehicles. The connector housing is correct on new vehicles.
Check the pin assignment. The pins in the new connector housing are color coded.
The packaging for the new heated oxygen sensor contains additional information.
–  Install the new oxygen sensor in the vehicle.
 

4-Pin Heated Oxygen Sensor (HO2S), Removing and Installing

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