Hey Scotty, I’m getting a check engine service light, my scan tool tells me it’s a P0420 error code. I personally do not think it’s the manifold.
I have changed the spark plugs, changed both oxygen sensors, everything under the car from the manifold to the exhaust is brand new. I have reset the codes about 5 times and it comes back up, but it varies, at 50 miles or 30 miles after reset, it did recently pass emissions inspections on my last reset about a week ago and it did not pop up again after 65 plus miles. I used cata clean and this seems to have worked for a bit.
this is a project car for me. My next step is to reset the computer with a 1 ohm 10 watt resistor like I saw you do in one of your videos to make sure it’s not the computer, I don’t have a $5000 scan tool like you do but if you said this alternative works, I figure i will try it, I ordered it and it will be here Tuesday so I can try it out. Scotty, is their anything else you’d recommend I try that I may have not thought off.
Forgot to mention the car has 142k miles on it
Clarification: You say everything under the car from the manifold to the exhaust is brand new. Does that include the catalytic converter? Were the parts replaced with OEM, esp. the sensors?
To clarify, the manifold was not changed, everything from the end of the manifold to the exhaust is brand new including oxygen sensor, New resistor, new catalytic converters, new muffler. I went one step further and also changed the oxygen sensor that’s in the manifold. So both oxygen sensors are brand new. Honestly I’m not sure it they are OEM, I had all this work done at Midas and what I paid I would believe was OEM parts.
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