99 ranger 4l
codes p0102 maf circuit low
p0135 o2 heater circuit
p0136 02 circuit
p0141 o2 heater circuit
p1401 diff pressure feedback egr curcuit
p1131/1151 lack heated 02 switches
p1504 idle air control circuit

does this mean the wiring between these and the computer is bad? Or is there a relay that controls all of this?
maf not plugged in because it causes car to die.