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P0420 and P0430 possible fixes

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P0420 and P0430 possible fixes. They worked on my 2005 Toyota Solara 2nd Gen 3.3L MFI DOHC 6cyl.
First get yourself an OBD2 Scanner Code Reader. I paid $ 20. Next, clear codes, run your car to a little less than a quarter tank of gas, put cat cleaner and follow directions on the bottle. Refuel to about half a tank of gas, drive till less than a quarter of tank and repeat the cat cleaner process. Next, let's get your car monitors ready. You must have all of your monitors ready to pass smog. Any time you disconnect the battery or clear codes your car monitors become inactive till a proper drive cycle is performed which is a pain in the but and sometimes doesn't even work. There is an easier way to get your monitors ready: Refuel to less than three quarters of the tank, let your car sit overnight, start the car in the morning, make sure you are in a well ventilated area and all of your accessories are off. Let it idle for fifteen minutes then step on the gas in park till you reach 3k rpms and hold it there for 3 minutes, you may after repeat this two to three times to work, it tuck three times to get my Toyota monitors ready. Make sure all of the fluids are at a normal level and space the procedure over three different days, you don't want to stress or overheat your engine by doing this consecutively. Hope this will help people with the dreaded P0420 and P0439 codes. It worked for me and has been over a thousand miles since I have performed this procedure on my Toyota Solara and the CEL has not come back on.

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Discussion Starter · #3 · (Edited)
Did it ever come back? Dealing with this code on my 08 Solara.
I reset it a while back, and went almost 300 miles before it came back.
No, my CEL is still off. Try this first: get yourself a Catalytic Converter Test Kit ( I will include photos ). Take out the Bank 2 Sensor 1 oxygen sensor and insert the Catalytic Converter Test Kit. Now start the engine and check if the pressure gauge is moving. If it is, your Catalytic Converter is clogged and needs to be replaced, if it's not moving, the Catalytic Converter is not totally clogged and I would repeat the cat cleaner process . If you're trying to pass the emission test, this will work to pass the emissions and give you some time to replace the Catalytic Converter.
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Interesting- I don't think mine is totally clogged. I had a clogged one on my 04, I could feel it struggle to accelerate and it used to overheat on the highway until I replaced it.
This one doesn't feel like that AT ALL, in fact, if not for the light I wouldn't think there's anything wrong, the car performance and mpg is excellent.
Passing inspection isn't an issue, I reset it with my ODBii computer and it stayed off for over 200+ miles! So I think it's a minor issue maybe... I haven't tried Cataclean yet, I'm afraid to try anything because last time mine had a real problem and all the additives made it worse!
(the front cat burnt out and pieces clogged the down stream one, causing major exhaust back up! I had tried some fuel additives to "burn it out" but the mechanic told me it probably broke it faster, it definitely got worse after that)
This seems minor, I just wanted to hear some Cataclean success on what appears to be a more minor p0430!
 

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To be clear, passing inspection isn't the issue, I just want to keep the light off so the Traction control / ABS system stays on. Toyota apparently punishes you for not fixing most CEL problems by disabling that on cars that have it!
 
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