P1166

DTC P1166 O2 Sensor System Lambda Bank Controller at the Limit (Bank 1)

DESCRIPTION

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

Detecting Condition & Limp Home:

DTC DETECTING CONDITION

1. DTC Description
If the lambda controller reaches to the maximum or minimum threshold, then no more feedback control is possible and emission will be increased. The ECM sets DTC P1166 if no proportional fuel adaptation occurs for a defined time after the lambda controller reached to minimum or maximum threshold. If the same error code is set in the next driving cycle, the ECM illuminates the MIL.

2. Conditions for Setting the DTC

Step 1 - 4:

Step 5 - 7:

Inspection Procedure