May 8, 2010ok i recently got my rear cats cut off and replaced with pipe but they didnt replace my o2 sensors back in the pipe. with them unplugged my truck keeps throwing check engine lights. my question is what would happen if i was to plug the sensors back up and zip tie them up out of the way. if im right they would tell my computer that the catalys system is working 100%. would that affect my performance in any way or am i just wrong in my thinking?
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May 8, 2010When you say (plug them back up) Do you mean put them back in the new pipe and hook them up?
If you put them in ,you might get lucky and not get a light on.
But if that doesn`t work you will have to have them turned off in the computer in order to keep your light from coming on.
May 8, 2010If you tie them up out of the way you`re still going to have the light on.
Because then the O2 sensors are telling the computer that the truck is 100% lean and will probably try to make the fuel mixture as rich as possible.
They make something you can plug into the O2 harness to trick the
computer into thinking the sensors are there, but I can`t remember what
they`re called. Someone on FTW should know. Sorry I can`t be of more
May 9, 2010ok thanks and yeah i meant just plug them up to JUST the harness. about the 100% lean i thought thats what the FRONT two sensors did. dont the back two tell the computer how wether or not the converters are working or not?
May 9, 2010Yeah,
if you just plug up the harness and tie them up out of the way,you will still get a light on.
You would need to put them (in the pipe).
And yes,the fronts monitor whether your lean or not. Don`t really need the back ones other then getting rid of the light and if they check that in your state inspections.
May 9, 2010preciate the help and theres some parts of GA that have inspections but not where im from
May 9, 2010Fish, the rear O2 sensors are looking for a slightly lower O2 level than what the front O2 sensors are seeing. This is telling the computer that the cats are doing their job. By plugging in the sensors and tieing them up out of the way, they are going to read the ambient O2 levels, leading to the computer thinking that the circuit has failed, popping the light on the dash.
Chris "Thermo" Coleman, Nukie the radioactive 97 Ford X, and K`Re Ann the 03 Jag X