2001 Chrysler PT Cruiser Base, AutomaticFACTORY OEM SERVICE PROCEDURE

DTC P0141: 1/2 O2 Sensor Heater Failure: Testing

  1. Turn ignition on. Using scan tool, read DTCs. If GOOD TRIP is displayed and equal to zero, go to next step. If GOOD TRIP is not displayed and equal to zero, go to step  5 .
  2. Turn ignition off. Disconnect 1/2 HO2S harness connector. Turn ignition on. Using scan tool, actuate O2 HEATER TEST. Measure voltage between ground and ASD relay output circuit (Dark Green/Orange wire) at 1/2 HO2S harness connector. If voltage is more than 11 volts, go to next step. If voltage is 11 volts or less, repair open in ASD relay output circuit.
  3. Turn ignition off. Measure resistance of heater ground circuit (Black wire) between 1/2 HO2S harness connector and ground point located on left front strut tower. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in heater ground circuit.
  4. Measure resistance of HO2S heater element between HO2S terminals No. 1 and 2 (component side). See Figure . If resistance is 4-7 ohms, go to next step. If resistance is not 4-7 ohms, replace 1/2 HO2S.
  5. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition:
    • With engine running at normal operating temperature, wiggle related wiring harness while monitoring related parameters on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set.
    • Review freeze frame information on scan tool. Duplicate conditions present when DTC was set.
    • Refer to any Technical Service Bulletins (TSBs) that may apply.
    • Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires.
    • Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals.

    If a problem is found, repair as necessary. If no problems are found, test is complete.

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.