Hello everyone,
I have the dreaded P0420 and P0430 error code come up in my 2012 TL SH-AWD. I did use cheap gas since I bought it used 3 years ago.
Have anyone tried any Catalytic Converter Cleaner to fix the P0420 and P0430 error code problem? If so, i would appreciate you sharing if it worked on not.

Thanks everyone

 

Currently trying Liqui Moly Catalytic System Cleaner (the fuel tank one) on my daughter's 2013 Hyundai Accent with the P0420 code. Waited until 1/4 tank then poured in product in the tank. Took it for a long spirited drive for 15-20 minutes on highway. Cleared code with scanner and it has been a couple of days with no return P0420 code. Only time will tell. Can't hurt for $30 and I assume will have to use again in the future if code returns. I didn't use the product that you put in a spray bottle and spray in the intake. Cataclean is another decent product. These may be just a version of lacquer thinner.

 

I knew someone that tried the Cat Cleaner solution, several times on a 3.5, trying to clear the codes but eventually fouled / plugged the cats (The internal honeycomb pattern melted together so that exhaust gases would no longer flow thru the cats).

 

Check engine light is still off after using the Liqui Moly Catalytic System Cleaner only once.

 

Can you just use O2 defoulers? Like the ones people use with test pipes or HFC's?

It just fools the secondary O2 into thinking everything is fine.

But it won't pass a visual check from an emissions inspector (if that is a concern)

 

Wow. I used Cataclean and it totally worked! It got rid of the check emission light!!!

 

Usually this joy ends after a few tanks.