Faulty Manifold Switch
Manifold Switch harness is open or shorted
Manifold Switch circuit poor electrical connection
Engine Light ON (or Service Engine Soon Warning Light)
Manifold Switch Over Malfunction is the generic description for the P1154 Audi code, but the manufacturer may have a different description for your model and year vehicle. Currently, we have no further information
about the P1154 Audi OBDII code.