Re: O2 sensor wire short macanic say have to replace trany and alternator
Came across this once before on a civic, the heat shield eats through the second O2 sensor, shorting the heater circuit, and blowing the ALT/SP SENSOR fuse, so that the alternator and speedo never work. You'll need to see if it shorted, and if so, what fuse it blew, they are probably related to some degree if they all occurred at the same time.
Retired ASE Master Technician/Advanced Level Specialist
GM Supplier Electrical Engineer (YF)