I added a used pcm check engine light code came on bt it wasn’t the p0505 now it’s reading an 02 sensor I’m replacing here soon will update u guys and let u know what happened at least that p0505 is off 🤦🏽‍♂️

 

so I added a used pcm right off the back the o2 sensor up stream heater 02 says it’s bad I added stand new Bosh and check engine light came on immediately after clearing the code I thinking on going back to the old con and c what’s going on I’m losing hope

 

These trucks really don't like Bosch O2 sensors......

Where did you get the PCM from? Might take it back, and see if they have another....

 

it was a walker o2 sensor I got the pcm from a wrecking yard I called dealership and they said they discontinued making those for the 2nd gen I out old computer back and the iac check engine light came on when I out the junk yard computer in its goes to the 02 sensor saying it’s bad clear the code come back on almost immediately when start up should I swap out the pcm again or?? The junk yard pcm whe replacing the o2 sensor I replaced with new one check engine light came on I drove it let file get hot no solution

 

If you weren't seeing the codes until you installed the junkyard PCM..... I would suspect the PCM.....

 

so the pcm that I had a friend pull for me was from a 2wd dodge so I have t go to pik n pull and pull a pcm from there my neighbor scanned it for me and a 47 number popped up the pcm isn’t sending a signal to the iac I’m guessing so pik n pull is my next stop then I’ll update !