Check the fuel pump fuse & relay.
1996
I would suspect a faulty VSS. Try replacing the vehicle speed sensor in the transmission.
Look on the transmission by where the axles come out
Do you mean the CO2 sensor? It is in the exhaust manifold where the pipes come together. The sensor looks like a spark plug with one wire coming out of it.
NO. Not until 1996
Yes
Replacing the water pump will not cause the check engine light to come on. Either it is a coincidence or you have accidentally disconnected a wire or damaged a sensor somehow.
usually a bad wheel sensor.
check the coolant temp sensor
Something else is causing the light to come on. Have the codes read.
I believe the engine has to come out and the block has to be opened up because the head gasket is in the center
bad speed sensor