Error Code P0420
#16
sure, switch bank 1 and bank 2 post cat sensors, see if the code follows the cat or the sensor. its not a lot of work, but if you cant use a ford scan tool its about the only thing left. youre gonna have to clear the code and see how it comes back, disconnect the battery or have autozone clear it. not to knock on the autozone or advance or checker guys or anything, but they dont get the same traning a technician does, ask the experts.
#17
My "expert" is out turkey hunting right now That's main reason why I asked here, I knew I would get the help I needed by people here. So take the sensor after the cat on both sides out and switch them, reset the code, and if it switches to bank 2 then it's the sensor. If it stays bank 1 it'll be the cat. Is that correct?
#18
99.9% of the parts people at AZ are idiots. The only training they have is how to sell you a part even if you don't need it. I'm surprised they didn't try to sell you a set of four O2 sensors to fix your cat.
You either need a cat or you have an exhaust leak upstream of it that is sucking air in. O2 sensors don't cause this code.
The only way to test the cat is to compare the reading of the up and downstream O2 sensors with a multi channel lab scope, graphing multimeter, or scanner.
You either need a cat or you have an exhaust leak upstream of it that is sucking air in. O2 sensors don't cause this code.
The only way to test the cat is to compare the reading of the up and downstream O2 sensors with a multi channel lab scope, graphing multimeter, or scanner.
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#28
if your catalyst has low efficiency it could plug up and cause your truck to run like total crap at any moment. if it was sucking in air you would have a lean code, which you dont. its either the cat or the sensor. dont let yourself get side tracked here. The governement says that auto makers have to warranty cats up to 80000 miles. but not the labor, beyond that its your mess. Or you could just keep driving it, the only reason the check engine light is on is beacuase you are potentially polluting with a failing cat, half of the requirements of OBD 2 are emissions related, and like 90% of all Powertrain DTC's are emissions related too. its a long story, but in short get a new cat or get a new sensor. as long as the bolts arent completely rusted you should be able to get them off with air tools, maybe hand tools. if they are super rusty=torch.
#29