On Audi vehicles manufactured within a specific period, the refrigerant pressure sensor for the air conditioner may fail after a period of time. As a result, the air conditioner compressor is switched off. This Update is in effect until removed. Procedure is valid only for vehicles that show the 87D9 code in the Elsa Campaign/Action Information screen on the day of repair. Vehicle must be within the New Vehicle Limited Warranty. Procedure must be performed within the allotted time frame stated in this Technical Service Bulletin. Procedure must be performed on applicable vehicles in dealer inventory prior to sale. On Audi vehicles manufactured within a specific period, the refrigerant pressure sensor for the air conditioner may fail after a period of time. As a result, the air conditioner compressor is switched off.