P1166 HYUNDAI - O2 Sensor System Lambda Controller at the Limit Bank 1
- Air leakage or restriction in intake or exhaust system
- Dirty engine oil or oil level too high
- Front HO2S or MAFS contamination
- Fuel system
- EVAP system
- Faulty sensor signals
- Engine Light ON (or Service Engine Soon Warning Light)
P1166 HYUNDAI Description
If the lambda controller reaches the maximum or minimum threshold, then feedback control is no longer possible and emissions will be increased. The ECM sets DTC P1166 if no proportional fuel adaptation occurs for a defined time after the lambda controller has reached its minimum or maximum threshold.
P1166 HYUNDAI Information for specific Hyundai models
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