DTC C12B3 Chevrolet
Fuel System Rich (Bank 1)
Fuel System Rich (Bank 1)
Description
Engine running in closed loop, IAT Sensor signal over 20ºF, altitude less than 8,000 feet, and the PCM detected too large an amount of Fuel Trim correction due to a rich A F condition.
Cause and Solution
Base engine fault (i. e. , cam timing incorrect, oil level too high)EVAP vapor recovery system failure (e. g. , canister full of fuel)Fuel control Sensor is out of calibration (e. g. , ECT, IAT or MAP)Fuel delivery component fault (injector leak, high fuel pressure)O2 element is contaminated, deteriorated or it has failedO2 heater is damaged or it has failed
Video Guide
Diagnostic Info
- DTC Code: C12B3
- Brand: Chevrolet