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Home >> Dodge and Ram >> 2004 >> SRT-4 >> Repair and Diagnosis >> External Pages >> Different car >> Section 4 (Engine Controls - Self-Diagnostics) >> Diagnostic Tests >> DTC P0135: O2 Sensor 1/1 Heater Performance & DTC P0141: O2 Sensor 1/2 Heater Performance >> Testing

DTC P0135: O2 Sensor 1/1 Heater Performance & DTC P0141: O2 Sensor 1/2 Heater Performance: Testing

WARNING: This page is about a different car, the 2003 Chrysler PT Cruiser. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition on, engine not running. With the DRBIII® scan tool, read DTCs and record the related freeze frame data. Is the Good Trip counter displayed and equal to zero? If yes, go to step  3. If no, go to next step.
  2. Turn the ignition off. Allow the O2 sensor to cool down before continuing the test. The O2 voltage should stabilize at 5.0 volts. Ignition on, engine not running. With the DRBIII® scan tool, actuate the O2 heater test. With the DRBIII® scan tool, monitor O2 sensor voltage for at least 2 minutes. Does the voltage stay above 4.5 volts? If yes, go to next step. If no, see INTERMITTENT CONDITION  under SELF-DIAGNOSTIC SYSTEM.
  3. Turn the ignition off. Allow the O2 sensor to cool down to room temperature. Disconnect the O2 sensor harness connector. Measure the resistance across the O2 sensor heater element component side. The following are the O2 sensor heater resistance specifications, 3.0-4.0 ohms (1/1 and 1/2) or 4.0-5.0 ohms (1/2 and 2/2). Is the resistance within the specifications? If yes, go to next step. If no, replace the O2 sensor.
  4. Turn the ignition off. Disconnect the O2 sensor harness connector. Measure the resistance between an engine ground and the O2 heater ground circuit in the O2 sensor harness connector. Is the resistance below 0.5 ohm? If yes, go to next step. If no, repair the O2 heater ground circuit for an open/high resistance.
    5. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool (8815) to perform diagnosis.
  5. Turn the ignition off. Disconnect the O2 sensor harness connector. Disconnect the PCM harness connectors. Measure the resistance of the O2 heater control circuit in the O2 sensor harness connector to the appropriate terminal of Miller Special Tool (8815). Is the resistance below 0.5 ohm? If yes, go to next step. If no, repair the O2 heater control circuit for a open/high resistance.
  6. Using the wiring diagram as a guide, inspect the wire harness and connectors. Visually inspect the related wire harness. Look for any chafed, pierced, pinched, or partially broken wires. Visually inspect both the component and the PCM connectors. Pay particular attention to all power and ground circuits. If there are no possible causes remaining, replace and program the PCM. See PROGRAMMING .
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