DTC P1166: O2 Sensor System Lambda Bank Controller At The Limit (Bank 1) & DTC P1167: O2 Sensor System Lambda Bank Controller At The Limit (Bank 2): Description

Lambda closed-loop control system is included in the engine's control system. The control system regulates lambda upstream with HO2S signal. Rich mixtures generate the high concentrations of CO, H2, and HC. Lean mixtures generate the high concentrations of NOX, and free oxygen.