P0420 code
 

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CEL came on today. Went to autozone pulled p0420.

Thoughts on this direct fit cat converter to fix p0420 code? Cost $130

Or should i get a spacer? its 8$ and no drilling required right?

Do you need to pass smog with a visual inspection? The spacer may not work in that case but otherwise do whatever it takes.

For eight bucks -- the cost of a Big Mac Meal -- why not try the spacer? You can always fit a replacement cat. While you're under the car spray all the bolt threads with PB Blaster and let them soak in case you need to pull the cat later.

-- Chuck

Take your cat off the car, see if the media moves around or rattles when you shake it. Typical way they fail. You may even see loose media in there when you remove it if it is going bad. If the Cat is actually getting plugged you really want to address that vs just using the defouler trick.

But for reference, if doing the defouler trick you want 2 of them. Drill the small hole out to the diameter of the inside of the defouler on one, then screw that one into the other defouler, then screw into the test pipe, hollowed out cat, etc :) One may not be enough to fool the system.

You can use the defouler though as a cheap way to see if the sensor is just bad. Most times the 2 defouler trick will work even with a test pipe so if the light comes back on you may have a bad secondary sensor instead of a bad cat.

Sorry to bring this back up. But the inside of the cat moves around and is no longer good; snapped my o2 sensor

I currently have a hks hi power exhaust.

Not sure about a used oem or the ebay cat.
Thinking about a high flow cat.

Any suggestions im seeing a lot people mention berk and am i okay without a tune for the hfc?

you can use a berk HF cat on an hks hi power and not necessitate a tune. Many of us out here doing it.