There are three generations of VW Passat TDI in the United States… B4 Chassis – Passat TDI Models: 1996-1997 B4 Passat TDI Sedan and Wagon w/ Engine code 1Z Most B4 Passats have engine code 1Z though some later models were equipped with the nearly identical AHU motor instead.  These were the first TDIs sold … Continue reading What TDI Do I Have – Passat