Application This socket set is designed for the removal inspection or replacement of heated and nonheated oxygen sensors fitted to the following vehicle Audi, BMW, Citroen, Mercedes, Peugeot, Renault, Skoda. These sockets feature cutaway sections allow some sockets to fit over wiring harnesses, complete with the black phosphate finish for a durable design. 38 Drive 78 12 Oxygen Sensor SocketVacuum Switch Socket removes and installs vacuum switch with a 78 hex and some oxygen sensors; 38 Drive 78 318 oxygen sensor socket removes and installs oxygen sensors in domestic and many import vehicles. Slot in socket for wire clearance. 12 Drive 1316 312 vacuum switch socket removes oil pressure sending units on late 80s to mid 90s GM models; 12 Drive 1116 314 thermal sensor switch socket removes and installs thermal sensor switch on 19731977 CM vehicles; 38 Drive 1 and 1116 3 remove oil pressure sending units. Deep design fits switches up to 258. 12 drive 78 2 heated oxygen sensor sockets slot in socket accommodates connectors on heated oxygen sensors; 38 Drive 78 114 low profile design for use in tight spaces. This set includes 1116 and 1 in. oil Pressure sending unit socket, 38 in. drive, 1316 in. Oil pressure sending unit socket, 12 in. drive, 1116 in. thermal sensor switch socket, 12 in. drive. 78 in. heated oxygen sensor socket, 12 in. drive, 78 in. low profile offset oxygen sensor socket, 38 in. drive, 78 in. oxygen sensor socket, 38 in. drive, 78 in. universal vacuum PVS, TVS Valve and oxygen sensor socket, 38 in. drive.