Excessive Time To Enter Closed Loop Air/Fuel Ratio Control
ECU took longer than allowed to enter closed-loop air/fuel ratio control. Most often O2 sensor heater aging or coolant temperature reading wrong.
Affected components
- Oxygen sensor
- Ect sensor
Common causes
- High likelihood: O2 sensor heater aged
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
- A drive cycle may be required after repair
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.