Here it is. I have a 2001 F150 Supercrew 5.4 triton, of course there are 4 o2 sensors on the truck and all of them went out. Instead of replacing them I would like to know how to rewire/ make them so they read a dummy code saying everything is perfect to my computer.

 

You can do that for the rears using MIL eliminators ( search), but not for the fronts.

The fronts are required for air/fuel management -they must be in place & working correctly or your truck will not run properly.

What led you to determine all four went south ??? That's not very common...

 

I have never seen or heard of all 4 O2s going out at once! Sounds more like a PCM problem with the O2 circuit. What are the codes you pulled?

 

Well I cant remeber all the codes off the top off my head but,2 different readers said they were all out, and of course at the same time my valve cover was leaking shorting out 3 coils and making it missfire on 3 cyclinders on the passanger side. I hate these newer cars! 1970 and back were the good days!

 

There is no way in hell that all four O2 sensors would have failed.

You have a fault that is causing the PCM to identify associated DTCs with all four sensors, but once you do your proper diagnosis, you will find that you actually have a failure in a circuit that is common to all four of them.

Code readers cannot say a sensor is "out", they can only report that the PCM has determined that a fault has occurred and what fault code the PCM has stored. It is up to the tech to take the available data and make a proper diagnosis, not just to start throwing parts at it because there is a fault code.

Chances are, the fuse for the common heater supply is blown.

Steve

 

All four did go out, not at once but over a months period first the two rear ones then the two front ones, trust me. Im probably just going to spend the 600 to replace all four sensors and all resinators and cats on the truck.

 

Given the rarity of downstream O2 sensor failures and your reporting that all four sensors are faulty within that short of a period of titime, I'd say that a lottery ticket has a better chance of being a winner.

Good luck, it's your money.