Faulty Mass Air Flow Sensor
High fuel pressure
Canister purge solenoid stuck open
HO2S harness is open or shorted
HO2S circuit poor electrical connection
Engine Light ON (or Service Engine Soon Warning Light)
Long Term Fuel Trim Adjustment Bank 1 System Too Rich is the generic description for the P1123 Audi code, but the manufacturer may have a different description for your model and year vehicle. Currently, we have no further information
about the P1123 Audi OBDII code.