986 Forum - The Community for Porsche Boxster & Cayman Owners - View Single Post - Additives? Searching for some info for my Audi

urban_legend · 11-29-2010, 04:41 PM

and I came across an additive (Cataclean) that is supposed to clean your catalytic converters to get rid of the dreaded bad cat code 0421.

And I wondered if anyone used any additives that they worked or were worth the price. I have seen good reviews for Techron and Tufoil but have never used them.

11-29-2010, 04:41 PM	#1
urban_legend Registered User Join Date: Feb 2009 Location: Ann Arbor, MI Posts: 287	Additives? Searching for some info for my Audi and I came across an additive (Cataclean) that is supposed to clean your catalytic converters to get rid of the dreaded bad cat code 0421. And I wondered if anyone used any additives that they worked or were worth the price. I have seen good reviews for Techron and Tufoil but have never used them.