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
Refer to O2S TEST RESULT for detailed information.
HO2S Output Voltage (Rich or Lean stuck):
| Test ID/Comp ID | Description of TEST DATA | Standard Value of TEST LIMIT | Conversion Factor (Unit) |
|---|---|---|---|
| $07 (1 MZ-FE) | The minimum sensor voltage while the malfunction is being monitored | Within 0.40 V | - |
| $07 (3MZ-FE) | The minimum sensor voltage while the malfunction is being monitored | Within 0.45 V | - |
| $08 | The maximum sensor voltage while the malfunction is being monitored | 0.6 v or more | - |
HO2S Output Voltage (Stuck Low):
| Test ID/Comp ID | Description of TEST DATA | Standard Value of TEST LIMIT | Conversion Factor (Unit) |
|---|---|---|---|
| $81 (1 MZ-FE) | Percentage in monitoring time where oxygen sensor voltage is less than 0.05 V | Within 75 % | Multiply 0.3906 (%) |
| $81 (3MZ-FE) | Percentage in monitoring time where oxygen sensor voltage is less than 0.05 V | Within 60 % | Multiply 0.3906 (%) |
| $84 | Percentage of monitoring time where oxygen sensor voltage is 0.70 V or more | 20% or more | Multiply 0.3906 (%) |
| $85 | Maximum Rich (0.45 V) continuously time | 20 seconds or more | Multiply 0.2621 (seconds) |
If all the values ($81, $84 and $85) are out of the standard values, the ECM interprets this as a malfunction and sets DTC.
HO2S Slow Response:
| Test ID/Comp ID | Description of TEST DATA | Description of Test Limit | Conversion Factor (Unit) |
|---|---|---|---|
| $37 (1MZ-FE) | Time until the rear HO2S voltage drops to 0.2 V after fuel cut starts operating | Within 65 seconds | - |
| $37 (3MZ-FE) | Time until the rear HO2S voltage drops to 0.2 V after fuel cut starts operating | Within 6 seconds | - |
If the time is out of the standard value, the ECM interprets this as a malfunction and sets DTC.
NO RELATED
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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.