if your car was built in 8-19-95 it was probably the 1996 models that came out onto the dealer lots in Sept. 1995 which would make it a 96. also from 1996 on the trouble codes were reported via the OBD II system which is three number codes.. the 1995 and older years had the two number trouble codes like 11, not P402.. so i looked up in my ford Service CD for 1996 and found out that P402 is the following:
P0420³
Catalyst system efficiency below threshold Bank 1)

i dont know what this means.. if you take your car to auto zone they will give you a free check of the Check Engine Light and then print out a paper what it cold be that is wrong with your car....