My car is throwing a P0420 Code. Dealer says I need a Catalytic Converter. We are at 189,000 miles - so we are out of the 150,000 warranty in CA. I have called Toyota Corporate to see if they will help. They will get back to me next week. I am being quoted $2800 by the dealer CA has strict rules, and we can only use OEM part, though the dealer said they'd put a junk yard part in it, as it would be OEM, however I can't find a junk yard that will sell one. Aftermarket doesn't seem to be available as well. Someone said that replacing the oxygen sensors might fix the problem as well -- any thoughts on that. We don't have to smog the car till March 2019. The codes have been cleared, check engine light is off, but we are expecting the P0420 code to trigger the check engine light again. Car runs fine.... any advice?