A malfunction of the oxygen sensor or lambda probe is indicated by the following symptoms during vehicle operation - frequent jerks, uneven engine operation or jerking, increased fuel consumption, exceeding toxicity standards, and premature catalyst failure.
Necessary
A digital voltmeter, a device for enriching the combustible mixture (a can of PROPANE gas), an adapter connector for connecting an oxygen sensor, a special instruction from the car manufacturer
Instructions
Step 1
Check the main parameters of the engine according to the manufacturer's instructions. Check the integrity of electrical circuits, ignition timing, voltage in the on-board network, absence of external mechanical damage and the operation of the injection system.
Step 2
Increase the gasoline content in the mixture. To do this, disconnect the oxygen sensor from the shoe and connect it to a voltmeter. Increase the engine speed to 2500. Artificially increase the proportion of gasoline in the combustible mixture using an enrichment device. Achieve a 200 RPM reduction in engine speed. If the car is with electronic injection, you can pull out and then insert the vacuum tube from the fuel pressure regulator in the line. If the voltmeter almost immediately shows a voltage of 0.9 V, then the oxygen sensor is working correctly. If the voltmeter responds slowly, and also if the signal level shows 0.8 V, then the sensor must be replaced.
Step 3
Do a lean mixture test. To do this, simulate air leaks. For example, through a vacuum tube. The sensor is correctly adjusted if the voltmeter reading is less than 1 sec. will drop below 0.2 V. Replace if the rate of change of the signal is slow enough or the level remains above 0.2 V.
Step 4
Do a dynamic mode test. To do this, you need to connect the oxygen sensor to the connector of the injection system. Connect a voltmeter parallel to the connector. Restore normal operation of the injection system. Set the engine speed within 1500. The voltmeter reading should be within 0.5 V. Otherwise, replace the oxygen sensor.
