P0420 Exhaust Leak Bubbles Between Cats 1 and 2.

Joined
Jan 13, 2011
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1,219
Location
Corrales, NM / Las Vegas, NV
I had the same issues a couple of years ago. I tried sealing between the cats. I didnt have any leaks at the Y. Ended up replacing the rear cat with a new OE cat and that solved it. What surprised me was Toyota had no core charge on the new cat! So I got 125 bucks for my old one at the recycler which brought my price down to around 300 bucks!
 

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