Heated Oxygen Sensor Monitor

This monitor applies to DTCs P0130, P0136, P0150 and P0156. Following conditions must be met during the test:

• Engine coolant temperature must be 176°F (80°C) or more.
• Atmospheric temperature is 41°F (5°C) or more.
• If automatic transmission, selector lever is in "D" range.
• If applicable, overdrive switch is in ON position.
• If applicable, power/economy changeover switch is in POWER position.

Monitor takes about 5 minutes to complete. To run monitor, use illustration. See Fig 1. Perform steps as follows:

1. Start engine.
2. Accelerate to 35-40 MPH.
3. While keeping accelerator pedal opening degree constant, keep speed at 35-40 MPH for 120 seconds or more (M/T in 4th gear on non-turbo, or 5th gear on turbo).
4. Return vehicle to shop and turn ignition off.
5. Confirm DTC is not output. If DTC is output, go to appropriate DTC test in appropriate SELF-DIAGNOSTICS article.

Fig 1: Running Heated Oxygen Sensor Monitor

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.