Volkswagen Polo Service & Repair Manual: 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. |
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| – |
Lay both of the oxygen sensor next to each other so the
sensor housings are the same level. |
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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. |
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 |
Note
Use the faulty sensor as a guide for installing all of the
accompanying attachments, cable ties or marking bands.
Do ...
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