I have a 2005 Buick Century with a 3.1L V6. I recently retrieved a code P0420 which indicates the catalytic converter is operating below its efficiency threshold. I’m considering using a gasoline additive called Cataclean. As the name implies, it’s supposed to clean deposits that build inside the cat. Has anyone in the community had any experience using this stuff, either good or bad? My main concern is, could it damage other parts such as the fuel pump or injectors? Any response will be appreciated.
It might work and it’s the least expensive alternative. You might as well try it. Before using Cataclean, try to establish why the converter is clogged and address the specific problem with the proper cleaner. Does your engine use oil? If so, that might be what clogged to catalytic converter and you should look for a cleaner that addresses that issue. Cataclean might be the right product, and you need to make sure.
Absolutely no exhaust leaks, lazy 02 sensors, etc.?
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My advice is that this product, which you add to the fuel, and is therefore burned in the engine, is not going to “clean” your cat at all. It’s a bunch of Baloney. There’s really only one way to clean a cat–unbolt and remove it, and clean it with brake cleaner or carburetor cleaner. Wait for all of the solvent to evaporate, then reinstall it.
Many people here will tell you that it’s impossible to clean a cat, and that if you are getting a catalyst efficiency code (P0420) you’ll need to buy a new one. However, that is not true. Assuming that the ceramic honeycomb isn’t damaged, cleaning will work, especially if the problem is oil consumption or unburned fuel due to poor compression on one or more cylinders. I have pulled and cleaned the cat to get vehicles through emissions, and it works. If the engine has been repaired, the problem will stay away for a while, maybe even a long while. If not, the trouble code will probably come back soon, but as long as you already took the car through emissions and renewed your license plate, whatever.
And of course, don’t forget that catalyst efficiency codes can sometimes result from worn-out O2 sensors, especially the rear sensor. If you’re going to pull and clean the cat, you might as well replace both O2 sensors with a quality brand, such as Bosch or Denso. NEVER use a cheap, generic brand, such as Duralast or O’Reilly’s house brand.
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