CAT Cleaning and O2 sensor without removing

[mik36]

Hi All

I am looking for a method that enable to clean cat and o2 sensor
without removing it.

I dont have any codes.

Its just preventive maintenance.

I have seen vaccum hose connected with injector cleaner on some cars then start car with 1500rpm

but i amnot sure where and is it ok for 1NRFE engine

Can some one pls share this experince

Any advise would be highly appreciated.

[komichal]

Hello there,
I have used OxiCat additive that declares the capability of cleaning up O2 sensors as well as the cat.
It did help to a friend of mine who could not pass the annual emission test here (not sure if you have something like that) but after he treated the car with one can of OxiCat the emissions went back to normal. So it may actually do something.