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How to Remove and Refit Oxygen Sensors

Diagnostics, testing, removal and installation of oxygen sensors must always be carried out by suitably qualified person/s.

ALWAYS COMPARE THE DIAGRAM DETAILS WE PROVIDE ON THIS WEBSITE before purchase to ensure the Connector Plug and Cable Length comply with the sensor you are replacing.

Removal instructions

O2sensors.com.au recommends sensor removal should always be carried out by suitably qualified persons. Make sure engine is totally cold and the vehicle is in gear/park, the handbrake is on and the keys are out of the ignition.

Ensure you follow all safety precautions when working on or under the vehicle.

Locate the o2 sensor connector plug and carefully disconnect. You may need to gently lever the plug apart with a small screwdriver if it does not easily disconnect, however, use extra care not to damage the connector, as the connector must be reusable. Check for corroded pins in the connector.

remove plug

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Ensure the sensor connector plug on the original sensor is the same as the new one supplied. Check without opening the plastic bag, as the item cannot be returned once the plastic packaging is tampered with or opened. You can review our return policy here

Using a suitable o2 sensor removal tool (see accessories) unscrew the o2 sensor in an anti-clockwise direction.

remove sensor

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Check that new O2 sensor wire length is an appropriate replacement. If a little longer than the original it should be suitable, however if it is too short then contact us.

Fitting new sensor

Ensure the replacement sensor is the correct replacement. Check without opening plastic bag, as the item cannot be returned once the plastic packaging is tampered with or opened. Review our return policy here

Apply anti seize grease (supplied with many sensors) to the new o2 sensor threads only.
DO NOT get any anti seize grease on the sensor head as this can damage the device.
DO NOT use any other compound, most silicon based compounds will poison new sensors inoperative.

WARNING: Anti seize grease may irritate the skin or eyes. If swallowed do not induce vomiting. In case of contact with skin, wash affected area with soap and water. In case of contact with eye, flush with water for 15 minutes. If irritation persists, consult medical assistance.

apply grease

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Start to screw in the new sensor by hand (clock wise rotation) until hand tight. Make sure the o2 sensor cable is not trapped or twisted. Then using the o2 sensor removal tool (see accessories) and a suitable torque wrench tighten sensor to recommended torque.

For 22 mm socket type tighten to 37 - 47 Nm (or Install finger tight then 1/2 - 3/4 turn with wrench)
For 16 mm socket type tighten to 20 - 25 Nm (or install finger tight then 3/4 - 1 turn with wrench)

tighten sensor

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Route new o2 sensor cable through the same path as the old unit making sure that it does not come in contact with the exhaust system or any moving parts. Connect the new sensor cable connector.

connect plug

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Check your work and if all is suitable then you should be ready to test drive your new sensor.

If the engine waring light is still illuminated in your vehicle you may require an appropriate scanner to clear the fault code from your vehicles computer memory.

If you need a code reader-scanner or any other tools for testing or installation check our accessories page.

clear code

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DO NOT drop or use an oxygen sensor that has been dropped or mishandled as this may have caused shock damage to the ceramic cell, remember these sensors are highly sensitive electrical equipment.

Misuse and mishandling is not covered by warranty.

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