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Old 05-16-2015, 11:15 AM
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CEL- P0420 Need some Advice after Cat replacement....

Hey guys whats going on. So couple weeks ago car threw code P0430,Which is Low Bank 2.. So I reset Computer and then day later the code came back. And this was for a week. SO I went to auto store bought me some NTK o2 Sensors all 4 to replace. I then replace them all, and still had the Code. So I then Called Magnaflow to get me some replacement cats. I ordered Magnaflow 99204HM which are the standard Universal cats for the 3.7L Had them welded on by shop. I reset the Code at the shop and the next day going to work I get Code p0420, Which is Low Bank 1.....

Kind of odd that it jumped from Bank 2 to Bank 1 like that. Im not sure where to begin or where to go with this. But I cannot get my inspection done until I fix this, and My 10 extention is done. So Im at a loss and really going crazy trying to figure this out.

My next step I will check for Leaks at the Cats, But how can I check the o2 sensors to make sure they are working properly with out a scanner??

And has anyone had issues with using NTK o2 sensors VS buying Mopar?

Thanks guys any advice and help would be great.

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Old 05-16-2015, 11:53 AM
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Re: CEL- P0420 Need some Advice after Cat replacement....

http://www.motor.com/magazine/pdfs/102006_09.pdf
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Old 05-17-2015, 05:47 AM
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Re: CEL- P0420 Need some Advice after Cat replacement....

If you have an android phone (i-phone probably as well), you can buy a cheap bluetooth dongle of e-bay and download the free Torque app. You can than monitor the O2 sensors (any many others, besides you can read and clean DTC's). Very handy and cheap tool (if you already have the phone).
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