| DTC Strategy |
- Evaluate O2 sensor Element Temperature via measuring Element Resistance
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- Related fuse blown or missing
- Heater control circuit open or short
- Power supply circuit open or short
- Poor connection or damaged harness
- Faulty HO2S
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| Enable Conditions |
- O2 sensor pre-heating phase finished (dew point passed)
- No relevant failure
- Coolant temperature drop since the last engine stop > 25°C (77°F)
- 10V < Battery voltage < 16V
- 3.5% <O2 sensor heater control duty <96.5%
- O2 sensor operative ready (to ensure no open circuit failure present)
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| Threshold Value |
- Too slow O2 sensor tip-temperature increase after Start causing too low catalyst diagnosis result (O2 Sensor Heater Power <20% of Nominal Heater Power)
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| Diagnostic Time |
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| Mil On Condition |
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