12 Battery or computer recently disconnected
22 Coolant sensor signal out of range - May have been disconnected to set timing
34 Speed control Solenoid circuits
21 Oxygen sensor signal doesn't change (stays at 4.3-4.5V). Probably bad oxygen sensor
42 Fuel pump relay control ckt, Auto shutdown relay control ckt, No ASD relay output voltage at PCM, Fuel level sending unit volts out of range, Fuel level unit No change over miles