DTC U1144 Buick
Fuel System Too Lean
Fuel System Too Lean
Description
Key on or engine running, all electrical components off and coolant temperature at least 80 degrees Celsius; and the DME detected the Bank 1 Adaptive Fuel Control System reached its rich correction limit (a lean A F condition). The fuel status is in a clo
Cause and Solution
Air leaks after the MAF sensor, or leaks in the PCV systemExhaust leaks before or near where the HO2S is mountedFuel injector(s) restricted or not supplying enough fuelFuel pump not supplying enough fuel during high fuel demand conditions
Video Guide
Diagnostic Info
- DTC Code: U1144
- Brand: Buick