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Code 32 - Oxygen Sensor (O2S)

NOTE: Refer to illustration for connector and terminal identification. See Figure -Figure .
  1. Turn ignition off. Disconnect ECM and oxygen sensor connectors. Measure resistance between ECM 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 ECM harness connector or replace ECM. If voltage is not fluctuating between .1 and 1.0 volt, replace oxygen sensor.
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