P1123 Cadillac Long Term Fuel Trim Adjustment Bank 1 System Too Rich
Possible causes
– Faulty HO2S
– Faulty Mass Air Flow Sensor
– High fuel pressure
– Canister purge solenoid stuck open
– HO2S harness is open or shorted
– HO2S circuit poor electrical connection
– Faulty Mass Air Flow Sensor
– High fuel pressure
– Canister purge solenoid stuck open
– HO2S harness is open or shorted
– HO2S circuit poor electrical connection
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
Cadillac Vehicle:Cadillac CTS Coupe, Cadillac CTS-V Coupe , Cadillac Eldorado , Cadillac Escalade EXT , Cadillac ATS , Cadillac CTS , Cadillac CTS Sedan , Cadillac CTS Sport Sedan , Cadillac CTS-V , Cadillac CTS-V Sedan , Cadillac Catera , Cadillac DTS , Cadillac DeVille , Cadillac STS-V , Cadillac STS , Cadillac Seville , Cadillac XTS , Cadillac XLR , Cadillac XLR Platinum , Cadillac Escalade , Cadillac SRX