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Heated Oxygen Sensor (Ho2S) No. 2

  1. Start engine and allow it to reach normal operating temperature. Pull back seal at HO2S No. 2 connector. Using a voltmeter, backprobe HO2S No. 2 connector between sensor signal and sensor ground terminals. See Figure .
  2. Increase engine speed to 2000 RPM and hold for about one minute while observing voltmeter. Reading should be far less active than HO2S No. 1. If voltage is not as specified, see DTC P0136 and P0420 in TESTS W/CODES article.
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