Cataclean (120007-2PK) Fuel and Exhaust System Cleaner - 16 fl. oz., (Pack of 2)

I haven't yet had any problems with the CEL or smog-test results with my 1995 orphaned Isuzu Trooper LS. But I have kept spreadsheets with dates, mileage, expenses and smog-test results for the vehicle since I bought it used in 2002. CA requires me to smog-test the car every two years for annual registration, and CA has some tough standards. Worse -- they made the emissions standards tougher across the board in 2008. I understand, though: There was a time during the late 1960s when the smog here was so bad, I couldn't see the time on the university bell-tower from the edge of campus, and I could taste the air. It had a flavor like sour milk.Reviewing the smog-test results over the lasts 20 years, I see that the HC and NOx results are edging up. Further, the HC result for December, 2021 was 59, and the maximum allowable was 60. Well, folks, I aim to stave off disaster. What would that disaster be, anyway?I budget $1,000 annually for repair and replacement on my Trooper. Sometimes I exceed budget; sometimes I'm under budget. But I invested more than the budgeted amount over the last 5 years with various restorations and parts replacements. If added to the average expense of my ownership for the last 20 years together with the monthly insurance premium, the vehicle has cost me about $180 per month over 20 years with the original purchase price also included in the average. Not bad for a luxury SUV, when the car-mortgage and insurance over the same time for three successive new-car replacements less trade-in or resale value might be two or three times as much.Replacing the catalytic converter, the heated-oxygen sensor and ancillary exhaust parts would cost at least $1,000, assuming I can find the part. If it can be avoided, I'll be better off. This Trooper, in the sunset of the petroleum age, will likely outlast me in my own sunset years.I followed the directions, realizing that a person would like to get the full value out of a $30 bottle of Cata-Clean. So I found a 15-mile stretch of highway, with gas-stations at either end, and drove two miles to the nearest station with a quarter-tank of gas and the Cata-Clean in the tank. I ran the vehicle down the highway, then added exactly 1 gallon of gas for safety, returned to the first gas station, added another gallon, repeated the trip a few times until finally filling the entire tank.The vehicle runs noticeably better. I will repeat this operation in three months and then again, until my smog-test in December 2023. I hope to see some good results. Platinum doesn't deteriorate. So if the product does as promised, the cat-converter should be totally renewed. If I spend $150 on the product and save the $1,000 expense, my year-long project will be totally successful.How does it work? The product creates carboxylic acid for the exhaust, which cleans the cat-converter. There is no damage to the metal parts, and of course the manufacturer recommends using it every three months or so. Cata-Clean is recommended by smog-test technicians, and my retired-mechanic cousin, who has read up on the product, also seems to think it will be effective.

About a week ago, my Check Engine light came on. I have a 2017 Honda Accord Sport I bought brand new. I baby the maintenance out of it as the vehicle is paid-off & I LOVE 2 years of no car payments. This is the first time my Check Engine light stayed solid after powering on the car. I ordered one of those OBD2 scanners on Amazon. I reasoned its probably time to invest in one as the Accord is approaching 100K miles. P0420 was my only code. I called around to a few Honda dealerships trying to get an idea of the financial comet about to hit my wallet. I also reached out to a few local mechanics. A $2/3K repair cost was not going to be in my future. I sat down it front of YouTube and researched the HELL out of P0420. I purchased a new PCV valve for $10 and 2 bottles of Calaclean for $45. After replacing the PCV valve & following the instructions to use Cataclean, @ almost 500 miles later, I have not seen that annoying Check Engine light since.Bonus: Acceleration has improved & my Honda is running smoother. My plan is to use Cataclean after every oil change to keep my fuel & exhaust systems clean & optimized.

Great product for the job.

it work little bit and expensive

'03 Subaru Baja with over 200,000 miles on it. My check engine light came on, checked the codes, and it came up as both Catalytic converters were bad. Looking up the difficulty of finding the right part for my hard to get parts for vehicle, and the cost of repairs, I thought I was going to have to stop driving it. Did some asking around, and at the advice of other Subaru enthusiasts I bought this stuff. I followed the directions on the bottle, which was super easy. Took it for an hour long drive, and the codes turned off. It has been almost two months since running it through the system, and the code has not returned. Very relieved and happy to continue driving a vehicle I love. I don't know how it will work with a car that the codes have been on for a longer period of time, I was able to get this in the tank within a week of the check engine code appearing. With it being an older vehicle, I plan to use this stuff annually as a preventative to keep it running as long as possible.Quick update, now almost 5 months later, codes have not returned and it just passed its annual emissions test and inspection! This stuff is awesome.

This may work but in our case we needed a new cat. I gave the rest to my friend who had Carburetor problems on his motorcycle and it seemed to clean up a clogged carburetor that would not Idle. It worth a try because its much less expensive than a Catalytic converter replacement.

Don’t waste $2500 on a replacement Catalytic converter. Run your fuel tank down to 1/4 full. Add a bottle of cataclean, drive 20 miles at highway speed, and bingo… code gone. Refill yor tank and add cataclean 2 times a year to maintain your Cat.

So far hasn't worked for my vehicle, and it's expensive.