Heated Oxygen Sensor Monitor

This monitor applies to DTCs P0130, P0133, P0136, and P0139. Following conditions must be met during the test:

• Engine coolant temperature must be 176°F (80°C) or more.
• Atmospheric temperature is 14°F (-10°C) or more.
• On A/T, selector lever is in "D" range.

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

1. Remove all test equipment from vehicle and install all components and connectors that were removed or disconnected during testing.
2. After engine is completely warmed up, turn ignition off.
3. Start engine and accelerate to 35-40 MPH.
4. While keeping accelerator pedal position constant, keep speed at 35-40 MPH for 120 seconds or more. On M/T, use 4th gear.
5. Return vehicle to shop and turn ignition off.

Fig 1: Running Heated Oxygen Sensor Monitor

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.