Service engine soon light is on

If your connector is trapezoid shaped, then you have OBD 1.5. Most GM's in 1995 were this setup. It is an OBD 2 style connector, but the computer speaks OBD1. This means that you need a rather expensive scanner to get the codes from it. Find an older mechanic's shop. They will probably have a twenty year old SnapOn scanner that will do the job nicely. If you want to buy your own scanner, it will easily run you $200.00 for it.

Thanks, first use full information have yet received. will give this a try. thanks again, Vern

The older OTC Genisys, Tech 1, snap-on MT2500 brick (with the correct cartridge) and a few others will talk to the OBD 1.5 vehicles. They are a pain because they can set both the OBDI 2 digit codes AND the PXXXX codes used with OBDII You can still pull the two digit light flash codes if you have pins in 3 and 4 but many do not.