P0420 O2 Sensor Simulator

My trucks been throwing a P0420 for awhile now. Thinking it’s probably a cat. Not willing to replace it right now, been looking into an O2 simulator. I’ve seen the URD simulator and I’ve seen the diy version. My truck has a cali exhaust so 2 cats and first sensor is AF and second is O2. Just wondering if anyone has any experience with these or any other tricks to make the cel go away.

 

Simulator will work the best. Unfortunately old Toyotas use a two bolt flanged sensor instead of a screw in so you can't do the spark plug nonfouler trick.

 

You can get a cheap OBD II Code Reader to reset the check engine light.
(Harbor Freight $34)
This is what I do.

But I read the following from a simulator website:
"...if the p0420 or p0430 cel is illuminated the engine control unit (ecu) will put the vehicle into "linp mode" (safe mode) resulting in poor performance and gas mileage"
Is this BS or true?

 

It's BS, it's just a tattletale code. A clogged cat will hurt performance if that's the real issue. But just a bad cat and the code don't affect anything

 

Thanks! I will keep deleting

 

There are screw in to 2 bolt flange adapters. I was sent one with an eBay O2 sensor.

 

It is my understanding that when the MIL/CEL is on the PCM will never enter closed loop status.
I have URD simulators in my Tacoma's in Mexico. The V6 version plugs right into the harness under the passenger seat, neat and clean. The 4 cyl one has to be secured under the truck but both do the job they were designed to do and in my opinion well worth the $ they are asking for the convenience of it.

 

They will enter closed loop as long as the code isn't for an essential fuel management or ignition system. The downstream sensors are not essential at all, simply a tattletale so you won't ignore emissions regulations.

 

I'm in exactly that same situation- I could build a simulator from scratch but it would require cutting wires to hook in. I would much rather have the mating connectors on an end to end extensio = (plug and play) and have all that under the passenger carpet like downtown style, not under the truck in the muck! Sounds like we need the URD simulators but they don't make them anymore? I have a Factory service manual and the wiring diagram, but none of that has the part numbers for the actual connectors we need. Maybe we can use the Wayback machine and see what is there for URD simulator? ewew921@gmail.com