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.
Oxygen Sensor Test Mode
This mode allows monitoring of oxygen sensor fault limits and actual values during test cycle. The test cycle has specific engine operating conditions that must be met for completion. This information is used to determine the efficiency of the catalytic converter.
To access OXYGEN SENSOR TEST mode, turn ignition switch to OFF position. Ensure test equipment is properly connected. Program scan tool using the following steps:
- Select vehicle and engine selection menu (optional).
- Select year, engine, model and any additional information requested by scan tool (optional).
- Follow operating instructions from scan tool menu.
- Select GENERIC OBD-II FUNCTIONS.
- Select OXYGEN SENSOR TESTS.
- Select appropriate oxygen sensor test and follow menu instructions. See OXYGEN SENSOR TESTS table.
| Test I.D. | Description |
|---|---|
| 01 | Rich To Lean Threshold Voltage |
| 02 | Lean To Rich Threshold Voltage |
| 03 | Low Sensor Voltage For Switch Time Calculation |
| 04 | High Sensor Voltage For Switch Time Calculation |
| 05 | Rich To Lean Sensor Switch Time |
| 06 | Lean To Rich Sensor Switch Time |
| 07 | Minimum Sensor Voltage |
| 08 | Maximum Sensor Voltage |
| 09 | Time Between Sensor Transitions |
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
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.
Rather have a pro handle this?
A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.
No obligation. See pricing before you book.