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Code 32 - Oxygen Sensor (O2S)

NOTE: Refer to illustration for ECU connector and terminal identification. See Figure -Figure .
  1. Turn ignition off. Disconnect ECU and oxygen sensor connectors. Measure resistance between ECU connector E30, terminal No. 10 and oxygen sensor connector terminal No. 4 (White wire). Zero ohms should be present. Measure resistance between oxygen sensor connector terminal No. 4 (White wire) and ground. Minimum of one megohm should be present. If resistances are not to specification, repair or replace harness connector. If resistances are okay, go to next step.
  2. Reconnect oxygen sensor connector. Start and run engine at idle. Disconnect oxygen sensor connector. Measure voltage between oxygen sensor connector terminal No. 4 (White wire) and ground. If voltage is fluctuating between .1 and 1.0 volt, repair ECU harness connector or replace ECU. If voltage is not fluctuating between .1 and 1.0 volt, replace oxygen sensor.
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