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As an ASE Certified tech myself, I never had any faith in anything that is dumped in the gas tank that claims it repairs catalytic converters (or anything else, for that matter). Understanding the fuel injection system as I do, as well as the ultra high combustion chamber temps and the incinerating heat of the converter itself, I knew nothing could survive such ungodly heat and molecular transformation to "clean out" the fuel system or the exhaust system, much less the catalytic converter itself! But faced with a PO420 code myself and determining the problem was indeed my cat, I reasoned that a $25.00 investment was worth a shot. I bought a bottle and dumped it in my tank at 1/4 full as the instructions say. I drove the 15 miles and then refueled. I reset my CEL and drove for over 100 miles with the light staying off. However, when I scanned it again, it still had a "pending" PO420 code even though light was off. 20 miles later, the light came on again so I was about to chalk Cataclean up as a big hoax. But upon reading more reviews, I found that some success stories stated that they acheived success only after buying a 2nd bottle and trying again. So I decided to give it a 2nd try. This time I let the fuel tank go slightly below the suggested 1/4 tank and I poured the 2nd bottle in the tank. Instead of just a slow, normal 15-20 mile drive I went out on the Interstate and punched the throttle wide open to over 5k RPM for about a half mile. Then I slowed down and did it again, and yet again. All 3 times black exhaust streamed out the tail pipe. Then I just ran it steady at about 70 mph til the tank was almost empty. I refueled with Sunoco 93 Octane because I thoiught it could only help the cause. I then reset the light, drove another 100 miles, and then did another scan. This time the "pending PO420" code was gone and the "codes" list was empty, stating "NO CODES". I have driven over 1,000 miles since and still no light and no codes! So I can personally attest that Cataclean is an authentic winner! My advice to anyone is to drive it longer than 15-20 miles and don't be afraid to punch the throttle to "blow out" the carbon while the Cataclean is doing it's thing. It really did work for me doing it that way. Good luck to all!