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Home >> Chrysler >> 2003 >> PT Cruiser Base, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 2 (Engine Controls - Self-Diagnostics) >> Diagnostic Tests >> DTC P0131: 1/1 O2 Sensor Shorted To Ground Or P0137: 1/2 O2 Sensor Shorted To Ground >> Testing
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DTC P0131: 1/1 O2 Sensor Shorted To Ground Or P0137: 1/2 O2 Sensor Shorted To Ground: Testing

WARNING: This page is about a different car, the 2002 Chrysler PT Cruiser. However, it is still accessible from the selected car via links, so may be relevant.
  1. Start the engine. Allow the engine to idle. With the DRBIII®, read the O2 Sensor voltage. Is the voltage below 0.08 volt? If yes, go to next step. If no, go to step  7.
    2. WARNING: When the engine is operating, do not stand in a direct line with the fan. Do not put your hands near the pulleys, belts or fan. Do not wear loose clothing.
  2. Ensure engine is idling. Disconnect the O2 Sensor harness connector related to DTC that is set. With the DRBIII®, monitor the O2 Sensor voltage. Is the O2 Sensor voltage above 0.08 volt? If yes, replace the O2 Sensor. If no, go to next step.
  3. Turn the ignition off. Disconnect the PCM harness connectors. Measure the resistance of the O2 Sensor Signal circuit in the O2 Sensor harness connector to ground. Is the resistance below 100 ohms? If yes, repair the O2 Sensor Signal circuit for a short to ground. If no, go to next step.
  4. Measure the resistance between the O2 Sensor Signal circuit and the Sensor ground circuit in the O2 Sensor harness connector. Is the resistance below 100 ohms? If yes, repair the O2 Sensor Signal circuit for a short to the Sensor ground circuit. If no, go to next step.
  5. Measure the resistance between the O2 Sensor Signal circuit and the Heater ground circuit in the O2 Sensor harness connector. Is the resistance below 100 ohms? If yes, repair the O2 Sensor Signal circuit for a short to the Heater ground circuit. If no, go to next step.
  6. There are no possible causes remaining, replace PCM. Program the new PCM. See PROGRAMMING .
    7. WARNING: When the engine is operating, do not stand in a direct line with the fan. Do not put your hands near the pulleys, belts or fan. Do not wear loose clothing.
  7. The conditions that set the DTC are not present at this time. The following may help in identifying the intermittent condition. With the engine running at normal operating temperature, monitor the DRBIII® parameters related to the DTC while wiggling the wiring harness. Look for parameter values to change and/or a DTC to set. Review the DRBIII® Freeze Frame information. If possible try to duplicate the conditions under which the DTC was set. Refer to any Technical Service Bulletins (TSB) that may apply. Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or partially broken wires. Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, or corroded terminals. Were any of the above conditions present? If yes, repair as necessary. If no, test is complete.
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