This actuator fits the Borg-Warner (or KKK) turbo on the AHU engine code A3 TDIs. This turbo was OE on the AHU engines, but may also be on 1Z engines if the turbo has been replaced. Although they fail less often than the actuator on the ALH engines, they do fail with age and corrosion, causing the turbo to not bleed off boost, sometimes sending the engine into limp mode. This actuator will not fit the GT15 turbos that were OE on 1Z engines.