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.
O2S Test Result: Notes
Refer to CHECKING MONITOR STATUS for detailed information on O2S TEST RESULT.
| Test ID | Test Item | Description | Unit Conversion | Unit | Standard Value |
|---|---|---|---|---|---|
| $07 | MIN HO2S V | Minimum HO2S voltage | Multiply by 0.005 | V | Less than malfunction threshold |
| $08 | MAX HO2S V | Maximum HO2S voltage | Multiply by 0.005 | V | More than malfunction threshold |
| $31 | Time $31 | HO2S switch time from Lean to Rich | Multiply by 0.04096 | second | Less than malfunction threshold |
| $32 | Time $32 | HO2S switch time from Rich to Lean | Multiply by 0.04096 | second | Less than malfunction threshold |
| $37 | Time $37 | Time that HO2S voltage drops to 0.2 volts after fuel-cut begins | Multiply by 0.04096 | second | Less than malfunction threshold |
| $81 | Time $81 | Percentage in monitor time when HO2S voltage is lower than 0.05 volts | Multiply by 0.3906 | % | Less than malfunction threshold |
| $84 | Time $84 | Percentage in monitor time when HO2S voltage is 0.7 volts or higher | Multiply by 0.3906 | % | More than malfunction threshold |
| $85 | Time $85 | Maximum time while HO2S voltage exceeded 0.45 volts continuously | Multiply by 0.2621 | seconds | More than malfunction threshold |
| $87 | Time $87 | Percentage in monitor time when HO2S voltage is 0.45 volts or higher | Multiply by 0.3906 | % | More than malfunction threshold |
If the sensor voltage is outside the standard values, the ECM interprets this as a malfunction and sets a DTC.
Use the Manual With the Right Hardware
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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.
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