Oxygen Concentration Sensor — Checking and Replacing (Granta 2190)

Contents: Examination ⇣ Removal ⇣ Installation ⇣

The vehicle is equipped with two oxygen sensors. The work is shown on the upper sensor, the lower sensor is checked in the same way.

The need to perform work can be determined by the fault code read through the diagnostic connector ("Checking the technical condition of the engine management system").

Warning! The sensors are installed near the catalytic converter, which heats up to a high temperature when the engine is running. To avoid burns, check the oxygen concentration sensors and remove them after the engine has cooled to a safe temperature.

To complete the work you will need a multimeter (in voltmeter mode), inspection ditch or overpass (to remove the lower sensor) and a special key for the oxygen sensor.

Examination

1. Prepare the car for work ("Preparing the car for maintenance and repair").

2. Disconnect the wiring harness connector from the oxygen concentration sensor connector.

2. Disconnect the wiring harness connector from the oxygen concentration sensor connector.

3. Connect the negative probe of the voltmeter to the engine ground. After turning on the ignition, we 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, then the power supply circuit is faulty or the ECU is faulty.

Removal

1. Remove the oxygen concentration sensor wire holder from the opening in the protective screen.

2. Using a 22 mm wrench, unscrew the sensor from the catalytic collector and remove the sensor.

2. Using a 22 mm wrench, unscrew the sensor from the catalytic collector and remove the sensor.

Note: A special key is required to unscrew the lower sensor. If there is no such key ("Tools, accessories and operating materials") you can cut off the handle of a regular 22 mm open-end wrench. If necessary, the lower sensor can be unscrewed from the removed catalytic collector.