Easy Fix for Code P0420 or P0430 Catalyst Efficiency Below Threshold Ford F-150. 

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I have the same code that had my check engine light come on, on my 2016 3.5 Eb. I do have a code reader, which has allowed me to delete the code...and so far (one week) it hasn't reappeared! Apparently another trick to find out more information, is to take the truck for a drive, and at a location where you can slide under the truck, take one of the laser devices to check for how hot your exhaust is. The inlet side (turbo side) 'should' be less hot, than the exhaust (outlet) side. It seems whatever action that goes on inside the CAT, it heats even more to burn off the gasses, thus is hotter. Mine was around 100 degrees hotter coming out of the CAT than going in. So, I'm thinking or assuming my sensor made need replacing! Another trick mentioned today by a highly recognized Ford Tech, was to take a rubber mallet (once cooled down I believe) and tap the bottom of the CAT, and listen for something bouncing around inside (the one he was tapping sounded like it had some rocks inside bouncing around). Thanks for the video! On edit- the previous owner took off the shield, and it's never been put back on, and I've had no issues in not having it. Also, another tip, they say to undo the electrical clip of the sensor, before taking it out. As you turn it, the wire turns as well, so you need it disconnected!

Awesome trick and video!!

I did this same thing in both the converters on my old 07 Lincoln MKZ

I’m getting the same kinda code in my 2018 3.5 . Needing me a local mechanic in the Houston area

Thanks for the video. What size bit did you use to open up the hole in the non-fouler? Looking to do this project this weekend to address my P0430 code. Thanks!

That's a nice SouthWest Airlines tool chest in the video at 2:31. Did you soak the O2 sensor in AeroKroil before removing it.

Hey man... Ive been trying to figure out if it's driver or passenger side. 30 is driver per previous answers. Thanks

I have a Ford Expedition and I have had the code P0420 from 7 months ago, friend I changed the catalyst and the oxygen sensor and the engine check is still going on, my car is 2020, what can I do? Do I do what you did in the video? Where can I buy that piece of the video? Do I necessarily have to go to a turner to modify the piece? I don't know what to do anymore, I added some caralizer cleaner and it didn't work either.

To confirm for P0420 and P0430, these are the two cats for passenger and driver side?

Is this addressing the underlying issue, or just keeping your enging light from coming on?

put alcohal in the gas tank and run for several miles to clean the converter and never bye a converter word from the pros

What size thread is the anti-fouler?

Where do you buy them and what are they called

Was the the driver side?

The way I see it. The p0420 is the biggest scam automakers have come up with. Here's why. Even if your cat is below efficiency, it still is working to clean the emission. It's just contaminated with oily residue from bad gas. So get some premium fuel and ride that car the way Italians do to clean their cats. They go to Germany and ride the Autobahn at +90MPH. The deal is that whenever this code comes up, the dealer will upsell an OEM cat that costs hundreds of dollars to install. Even with a new one, that P0420 may still come back if you don't remedy the underlying problem. For me, the shop that changed my oil filter added a little too much oil and this went through the PCV valve and into my intake manifold and fouled up the cat. That's the scam. Now I have to use that oxygen sensor spacer till the cats burns through that oil. I'd rather burn through that cat till the core melts. In my county, we don't do emissions. Rural areas don't have as many hippies messing up our way of life and telling us how to run our cars. Our air is clean because the area is sparsely populated by criminal government types unlike the big cities.

Nice trick at 120k it seems way to soon than normal.

I do believe this man don't know what he talking about now both whether or not you move it 1 in or 2 in she'll still be reading the same amount of carbon CO2