| DTC Strategy |
- Comparison of O2 sensor lean/rich period with calculated period.
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- Leak in intake or exhaust system.
- Faulty fuel system
- Front and rear HO2S connections reversed.
- Contact resistance in connectors.
- HO2S contamination
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| Enable Conditions |
- Coolant temp. > 74°C (165°F)
- 400°C (752°F) < Catalyst temp, model < 900°C (1652°F)
- 5km/h (3MPH) < Vehicle speed < 180km/h (112MPH)
- Engine speed < 3400 rpm
- 200 < Engine load (mg/rev.) < 700
- 11V < Battery voltage
- Stable driving condition
- Lambda regulation active
- Canister Purge Valve not in CLOSE state
- No relevant failure
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| Threshold Value |
- Average Ratio between measured and maximum allowed frequency during. 100 Lambda regulation cycles > 1
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| Diagnostic Time |
- 100 lambda controller cycles.
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| Fail Safe |
- Reset lambda adaptation and fuel trim adaptation.
- Front HO2S heater is controlled in open loop control.
- EVAP. Emission control function is controlled in minimum operation mode.
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| Mil On Condition |
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