mb doc you are a genius, the heater wires do not give any voltage at all. i tested my dad's W124 and checked his heater wires, they give off 13.37 DC volts.

i hadnt come online to check this topic yet, but i came to that conclusion myself after some more testing. I drove back from work on the freeway, went about 70mph most of the way, then parked the car in my driveway without turning the engine off. went inside to grab the multimeter, unplugged the O2 sensor and tried to read it. it WAS giving me voltage and WAS fluctuating even when I gave it throttle and let it off, but just was very slow.

i turned my engine off, went back to my dads W124 to do the same test, and his engine had been turned off for a couple hours. i unplugged the O2 sensor and read the voltage from there, was jumping around alot faster than mine was.

went back to test mine again and the O2 sensor didnt give anymore voltage. after that, i decided to test the heater wires and saw that it wasn't giving me any voltage.

so its been found, heater wires to o2 sensor are dead, now any ideas how to tackle this seemingly huge problem?