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 (A/T).
Monitor takes about 5 minutes to complete. To run monitor, use illustration. See Fig 1 . Perform steps as follows:
- Remove all test equipment from vehicle and install all components and connectors that were removed or disconnected during testing.
- After engine is completely warmed up, turn ignition off.
- Start engine and quickly accelerate vehicle to 35-40 MPH.
- While keeping accelerator pedal position constant (use 4th gear on M/T), keep speed at 35-40 MPH for 120 seconds or more.
- Return vehicle to shop and turn ignition off. Recheck for DTC(s). If any DTC(s) is set, diagnose affected DTC(s). See DIAGNOSTIC TROUBLE CODE DEFINITIONS .