Heated Oxygen Sensor Monitor
This monitor applies to DTCs P0133 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.
- Selector lever is in "D" range.
NOTE:
Remove all test equipment from vehicle and install all components and connectors that were removed or disconnected during testing.
Monitor takes about 5 minutes to complete. This cycle must be completed 2 times. Run monitor as shown. See Fig 1 . Perform steps as follows:
- Start engine.
- Accelerate to 35-40 MPH (56-64 km/h).
- While keeping accelerator pedal opening degree constant, keep vehicle speed at 35-40 MPH (56-64 km/h) for 120 seconds or more (during monitor).
- Return the vehicle to the shop and turn the ignition switch to LOCK position.
- Check for DTCs.
- If DTC P0133 or P0139 resets, return to appropriate test. See DIAGNOSTIC TROUBLE CODE DEFINITIONS .