Warning! The sensor is installed in the intake pipe, which heats up to a high temperature when the engine is running. To avoid burns, check the oxygen concentration sensor and remove it after the engine has cooled down to a safe temperature.
To complete the work you will need:
- multimeter (in voltmeter mode);
- inspection pit or overpass.
Examination
1. Prepare the car for work (see "Preparing the car for maintenance and repair").
2. Disconnect the wiring harness connector from the oxygen concentration sensor connector.
3. Connect the negative probe of the voltmeter to the engine ground. Turn on the ignition and check the supply voltage of the heating element at terminal B (the terminal designations are marked on the wiring harness block).
Note: The voltage at the terminal must be at least 12 V. If the voltage does not reach the connector or is less than 12 V, the battery is discharged, the power supply circuit is faulty, or the ECU is faulty.
4. Having connected the "minus" probe of the voltmeter to terminal C, we measure the voltage between terminals A and C.
Note: The voltage at the terminals should be 0.45 V. If the voltage does not reach the connector or it differs by more than 0.02 V, the power supply circuit is faulty or the ECU is faulty.
Removal
1. Cut the plastic clamp securing the oxygen concentration sensor wire harness to the cooling system hose (see photo above).
2. Key by 22 mm we unscrew the sensor from the inlet pipe and remove the sensor.
Tip: You can verify that the sensor is faulty by replacing it with a known good one.
Installation
We install the sensor in the reverse order. Using a new clamp, we fasten the sensor wire harness to the cooling system hose.
[The information is published on the website: VAZbook]
Warning! The sensor wiring harness must not come into contact with the exhaust downpipe.