Advise on replacement Catalytic converter, P0420 code

If your not in a CARB state, you can hang anything that passes federal smog regulations; which is pretty much anything in rockauto and amazon inventory. But excessive oil burn can also throw a P0420 code. Once that sensor gets coated with oil, it's going to mess with your fuel mixture. I would start at that upstream sensor, before ripping it apart.

While you got it apart drop the EGR cooler in a bucket of carbon, degreaser and clean out the EGR pathways.

 

Do you have emissions inspections?
If so, you may be in a State that requires CARB compliance. How much, how closely they check will vary.

Note, it takes a good amount of testing and money to get CARB approval. So, many top brands, like Walker, will be as good as factory, but will be ~50%-100% cheaper, because they haven't spend that time or money (that then has to be passed on to the consumer).

For a cat that will last as long as factory, go with Walker:

2010 TOYOTA PRIUS 1.8L L4 ELECTRIC/GAS Catalytic Converter | RockAuto
Check how much for S&H to your location.
Rockauto charges S&H based on actual shipping costs, from the warehouse.


From Amazon:

Code:

https://www.amazon.com/Walker-16649-Converter/dp/B0181H2XC6/

Walker Exhaust Ultra EPA 16649 Direct Fit Catalytic Converter
w/ Heat Recycle System
$648.31
EPA COMPLIANT -- For use on OBDII vehicles, 1996 and newer. Not legal for sale or use in CA & CO. Legal in NY & ME on EPA Federal Emission Equipped Vehicles only. Consult your state's aftermarket converter regulations for details.
DIRECT-FIT DESIGN -- Direct-fit bolt-on replacement solution with OE-style hangers, brackets, routings and heat shields for easy installation that doesn't require specialized fabrication and/or welding

Code:

https://www.amazon.com/Walker-Exhaust-54848-Tailpipes/dp/B01KGCO2VE

Walker Exhaust Ultra EPA 54848 Direct Fit Catalytic Converter
w/o Heat Recycle System
Brand: Walker
$808.07
EPA COMPLIANT -- For use on OBDII vehicles, 1996 and newer. Not legal for sale or use in CA & CO. Legal in NY & ME on EPA Federal Emission Equipped Vehicles only. Consult your state's aftermarket converter regulations for details.
DIRECT-FIT DESIGN -- Direct-fit bolt-on replacement solution with OE-style hangers, brackets, routings and heat shields for easy installation that doesn't require specialized fabrication and/or welding


Note, I'm not sure if your car has the heat recycling system or not.

Good Luck!

 

I was pretty curious why the without the heat recycle one is more money than the with heat recycle one. So I looked at the pictures....

By "direct fit", they seem to only mean the front connection, to the manifold. At the other end, you have to cut the original exhaust and join at the cut.

For the with heat recycle one, you have to make the cut ahead of your original heat recycler and sub muffler. The Walker thing is only the two cats.

For the without heat recycle one, you cut after your sub muffler. The Walker thing is both cats and a sub muffler.

Huh.

 

Right. The one for "with heat recycle" does not come "with" a heat recycler, so you have to reuse your old heat recycler and your old sub muffler.