Checking the health of the sensor
Switch off the ignition. Disconnect the oxygen sensor connector, connect a voltmeter to the terminals «3» and «4» (pic. 2-132, pos. 1), start the engine at idle and check the voltage with a voltmeter, which should vary between 0-1.1 V.
Checking the sensor heating element
Switch off the ignition. Disconnect the oxygen sensor connector, connect an ohmmeter to the terminals «1» and «2» (pic. 2-132. pos. 2) and check the resistance. which should be no more than 200 ohms.
Checking the supply voltage of the sensor heating element
Switch off the ignition. Disconnect the oxygen sensor connector, connect a voltmeter to the terminals «1»» and «2» cable part of the connector (pic. 2-132. pos. 3). turn on the ignition and check the voltage with a voltmeter, which should be about 4.5 V.
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