Cant shake this p0420 code!!

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06-07-2023, 04:33 PM

Eurynomestolas

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Join Date: Oct 2019

Posts: 150

Cant shake this p0420 code!!

This code is driving me insane. I replaced the cat and o2 sensor and this code comes back! any ideas? Can it be the second one? i am thinking of cutting it out an straight piping it!

06-07-2023, 10:44 PM

bronxteck

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Join Date: Apr 2019

Location: BX NY North East

Posts: 2,636

maybe you can "test" with a long reach spark plug non fouler on the last oxygen sensor?

06-08-2023, 06:55 AM

Disel

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Join Date: Jan 2023

Posts: 133

Quote:

Originally Posted by Eurynomestolas

This code is driving me insane. I replaced the cat and o2 sensor and this code comes back! any ideas? Can it be the second one? i am thinking of cutting it out an straight piping it!

Maybe the second oxygen sensor is buggy (behind the catalyst). It's easier to fake it then. That's what I did when I got sick of the error. Then I changed to another collector.

06-08-2023, 08:51 AM

Eurynomestolas

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Join Date: Oct 2019

Posts: 150

Quote:

Originally Posted by bronxteck

maybe you can "test" with a long reach spark plug non fouler on the last oxygen sensor?

how do you do that? Just put a spark plug into where the downstream o2 sensors goes? I am sick of this code if i just have to get a fouler I dont care.