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Heated Oxygen Sensor No. 2

  1. Start engine and allow it to reach normal operating temperature. Pull back seal at Heated Oxygen Sensor (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. Voltage readings should have slight fluctuations above and below .3 volts. If voltage is not as specified, see DTC P0136 and P0420 in appropriate SELF-DIAGNOSTICS article.
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