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Code P0130 - Heated Oxygen Sensor (Ho2S)

  1. Connect and operate scan tester, following manufacturer's instructions. Clear codes. Start and run engine at 3000 RPM until fan comes on, then run at idle. Increase engine speed to 2000 RPM, and hold at that speed for at least one minute. If Code P0130 appears, go to next step. If Code P0130 does not appear, problem is intermittent. Inspect for poor connections or loose wires associated with HO2S and ECM, then repair as necessary.
  2. Turn ignition off. Unplug HO2S connector. Start and run engine at 3000 RPM until fan comes on, then run at idle. Measure voltage between Blue and White wires at HO2S terminals. If voltage is greater than 0.1 volt, go to next step. If voltage is not greater than 0.1 volt, temporarily substitute known good HO2S, then retest system.
  3. Turn ignition off. Reconnect wiring to HO2S. Start engine. Measure voltage between ECM terminals D18 (White/Red wire) and D22 (Green/Blue wire). If voltage is greater than 0.1 volt, repair open or shorted White/Red or Green/Blue wire between ECM and sensor. If voltage is as specified, temporarily substitute known good ECM, then retest system.
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