Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Heated Oxygen Sensor Monitor
This monitor applies to DTCs P0132, P0133, P0134, P0137, P0138, P0139, P0152, P0153, P0154, P0157, P0158 and P0159. Following conditions must be met during test:
- Engine coolant temperature is 176-203°F (80-95°C).
- Ambient temperature is 14°F (-10°C) or more.
- Selector lever is in "D" range.
This one trip monitor, takes about 5 minutes to complete. Remove all test equipment (except scan tool) from vehicle and install all components and connectors that were removed or disconnected during testing. Select throttle opening angle data. Find a flat surface (no hills) to run monitor. To run monitor, use illustration and perform following steps. See Fig 1. Step numbers in procedure will correspond to step numbers in illustration.
- After engine coolant temperature is at 176-203°F (80-95°C), turn off ignition.
- Start engine and quickly accelerate to 35-40 MPH.
- While keeping accelerator pedal opening degree constant, keep vehicle speed at 35-40 MPH for 2 minutes or more. Do not turn steering wheel.
- Stop vehicle and turn ignition off.
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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.