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DTC P0137: 1/2 O2 Sensor Shorted To Ground: Testing

NOTE: 1/2 HO2S may also be referred to as an downstream oxygen sensor. 1/2 HO2S is located behind right catalytic converter.
  1. Turn ignition on. Using scan tool, read DTCs. If GLOBAL GOOD TRIP counter is displayed and displayed count is "0", go to next step. If GLOBAL GOOD TRIP counter is not displayed or displayed count is not "0", go to step  6.
  2. Turn ignition on. Using scan tool, read 1/2 HO2S signal voltage. Disconnect 1/2 HO2S connector and note voltage reading. If voltage is more than .16 volt, replace 1/2 HO2S. If voltage is .16 volt or less, go to next step.
  3. Turn ignition off. Disconnect PCM connectors. PCM is located on left side of engine compartment, between Power Distribution Center (PDC) and Transmission Control Module (TCM). See Figure. Visually inspect connectors for corroded, damaged, pushed-out or miswired terminals. Repair connectors as necessary. If connectors are okay, measure resistance between ground and Tan/White wire at 1/2 HO2S harness connector. If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair short to ground in Tan/White wire between 1/2 HO2S and PCM.
  4. Measure resistance between Tan/White wire and Black/Light Blue wire at 1/2 HO2S harness connector. If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, Tan/White wire is shorted to Black/Light Blue wire. Repair wiring as necessary.
  5. At this time, PCM is assumed to be defective. Replace PCM.
  6. Turn ignition off. Visually inspect related connectors and wiring harness for damage. Repair connectors and wiring harness as necessary. If connectors and wiring harness are okay, reconnect all connectors. Start engine. Wiggle 1/2 HO2S connector and wiring harness while monitoring scan tool display. If GOOD TRIP counter display count changes to "0", repair connector or wiring harness where wiggling caused display to change. If GOOD TRIP counter display count does not change to "0", no problem is indicated at this time. Check for any related technical service bulletins that may apply.
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