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Mr. Gasket Cataclean 120007 Fuel and Exhaust System Cleaner-16 oz.

380 customer reviews
| 16 answered questions

List Price: $24.99
Price: $19.98 & FREE Shipping on orders over $35. Details
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16.0 Ounce
  • Using Cataclean can lower your total hydrocarbon emissions by up to 50 percent
  • Reduces carbon build-up in catalytic converter, oxygen sensors, fuel injectors and cylinder heads which results in improved fuel efficiency
  • Improves overall vehicle performance-including driveability issues such as power reduction, hesitation, rough idle, hard starts and lost fuel economy
  • Safe for gasoline, diesel, hybrid and flex-fuel vehicles; does not alter fuel
  • Not for use in 2-stroke or oil / gas mix engines
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Special Shipping Information: This product may not be available for 1 or 2 day shipping due to federal regulations that require it to ship via ground ship methods only. This product can only be shipped within the 48 contiguous states.

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Frequently Bought Together

  • Mr. Gasket Cataclean 120007 Fuel and Exhaust System Cleaner-16 oz.
  • +
  • CRC 05063 Guaranteed To Pass Emissions Test Formula - 12 Fl Oz.
  • +
  • Autel MaxiScan MS300 CAN Diagnostic Scan Tool for OBDII Vehicles
Total price: $47.91
Buy the selected items together

Product Information

Size: 16.0 Ounce
Technical Details
BrandMr. Gasket
Product Dimensions9.2 x 2.7 x 1.6 inches
Item model number120007
Manufacturer Part Number120007
OEM Part Number 120007
Vehicle Service Type all-terrain-vehicles, utility-vehicles, street-sport-motorcycles, off-road-motorcycles, street-cruiser-motorcycles, street-touring-motorcycles, street-motor-scooters, snowmobiles, marine-personal-craft
Additional Information
Best Sellers Rank #1,132 in Automotive (See top 100)
Shipping Weight1 pounds (View shipping rates and policies)
Domestic Shipping Currently, item can be shipped only within the U.S. and to APO/FPO addresses. For APO/FPO shipments, please check with the manufacturer regarding warranty and support issues.
International Shipping This item is not eligible for international shipping. Learn More
Date First AvailableJuly 7, 2004
Warranty & Support
Warranty, Parts: Parts

Warranty, Labor: Full Manufacturer's Warranty - Sold by Authorized Reseller

Manufacturer’s warranty can be requested from customer service. Click here to make a request to customer service.

Product Description

Size: 16.0 Ounce

Mr. Gasket Cataclean is a fuel and exhaust system cleaner that reduces carbon build-up and cleans your vehicle's catalytic converter, oxygen sensors, fuel injectors, and cylinder heads. Cataclean does not alter fuel composition and is safe for gasoline, diesel and hybrid engines. Testing at an independent emissions testing facility showed using Cataclean can lower your total hydrocarbon emissions by up to 50 percent (performance results are dependent on driver habits and vehicle condition). Use Cataclean to fix drivability issues such as power reduction, hesitation and hard starts, as a pre-treatment before an emissions test or to extend the life of your vehicle engine. Using Cataclean may help to avoid the replacement of costly oxygen sensors or your vehicle's catalytic converter. If you have to replace your catalytic converter, use Cataclean with the installation to extend its life. Cataclean is easy to use-simply pour in your fuel tank. Cataclean is 50 state legal and complies with VOC (including California) and OTC regulations, as well as Federal low sulphur content requirements for use in diesel motor vehicles and non-road engines. For optimum performance and protection, use Cataclean four times a year. Made in the USA.

Customer Reviews

Most Helpful Customer Reviews

111 of 122 people found the following review helpful By Richard A. Roeser on February 26, 2011
Size: 16.0 Ounce Verified Purchase
I have an 02 Chevy Tahoe with 127K on it. I've been throwing P0420 & P0430 codes for about 8000 miles, and lately they come back within a day of being cleared. Following the advice of another reviewer, here's what worked for me:

I used CRC 05110 Mass Air Flow Sensor Cleaner - 11 Wt Oz. first to clean the MAF, let the car warm up for about 20 minutes, poured a bottle of Cataclean in the tank and drove for about 25 minutes (less than 1/4 tank of gas in the car). Then I cleared the error codes. Let the car sit while I was at work, drove it home, put a bottle of Lucas 10020 Upper Cylinder Lubrication & Injector Cleaner 5.25 oz. in the tank and filled up with Premium gas. I've driven for 70 miles and the code hasn't come back. I just passed inspection this morning.

I don't fool myself that this stuff will cover up a bad catalytic converter. But I can say that for me, whatever it did was good enough to allow the car's ECM to run the emissions test at least a couple of times without registering an error code. I don't care if the code comes back tomorrow. For the $35 that I spent for the three bottles, I have delayed a $2000 plus repair.
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106 of 117 people found the following review helpful By N. Allen on May 17, 2014
Size: 16.0 Ounce
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.
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45 of 48 people found the following review helpful By silence dogood on July 25, 2014
Size: 16.0 Ounce
07/25/2014 - About two weeks ago my 2005 Honda Civic's computer threw a code and the engine light came on. I plugged in my ODBII reader to get the code(s) and got a P0420 Catalyst System Efficiency Below Threshold. Generally a mechanic will tell you that you need to replace the catalytic converter... about a $1,000+ job in a civic. I reset the computer and the engine light went out.

Given what the catalytic converter's job is, it stands to reason that it can get dirty and the screens clogged with carbon deposits. The same with the O2 sensors. Did some research on the web at found this product. The reviews were mostly good. In the meantime the engine light stayed off for a week. Once it came back on, I put a good fuel injector cleaner in it as I just had an oil change and I usually put fuel injector cleaner in at the same time. I reset the computer with my OBDII reader, and ordered Mr. Gasket Cataclean. Four days later the engine light came back on.

The cataclean product came and I waited and drove until I was below a 1/4 tank of gas so I'd run the max strength of the product through the fuel system. Put it in an drove mostly highway miles at 60 mph or better for 75-80 miles over two days. Last night on the way home from work the low gas light came on, so I pulled in to fill up and turned the car off. When I started the car after fill up the engine light went off on its own. So it looks like the product did the job.

Immediate results: Big difference in acceleration a whole lot more pep. Engine is quieter. Idle RPM's have dropped. The engine and fuel system have that little growl again like the car is breathing much better. I now assume that gas mileage will improve.

My car is not due for inspection for another year.
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77 of 88 people found the following review helpful By P. Sikes on October 16, 2011
Size: 16.0 Ounce Verified Purchase
Another reviewer said this is not a miracle product, but for me it was. It truly has saved me $975. My 2000 Chevy Prizm check engine light has been off and mostly on, for like 10 months. It was time for inspection and I didn't pass because the light was on so I took it to a dealer (yes, I know, I know but the last time I didn't go to the dealer when the check engine light was on it went in the shop 5 times and was never fixed correctly until I took it to a dealer). On top of a whole host of other completely inflated and bogus repairs they suggested, they told me I had to REPLACE the catalytic converter to the tune of $1,000+. There was no other option. This was it. For an old, high mileage car it wasn't worth it and I came very close to just selling the car to a junkyard.

I have my own code reader Autel MaxiScan MS300 CAN OBD-II Scan Tool which I bought for $20. The dealer charged $60 to tell me the same code as this reader gave. The code was P0420 which is catalytic converter insufficiency.

I used the Cataclean exactly according to the directions on the bottle and right after pouring it in the gas tank, I reset my code reader. The check engine light came on 9 miles later. I thought maybe the Cataclean had not had time to work so I reset it again. It came on in 25 miles. I thought, it's getting better. I reset the code reader one last time, drove 50 miles with no problem, got my car reinspected and PASSED! I have now driven more than 100 miles and still no check engine light. I will recommend this product to everybody, all the time - and I mean all the time. Like you'll say, hmm, I wonder what I should have for lunch today, and I'll be like, hey did I tell you how great this Cataclean product is that I bought from Amazon? And you'll be like, yeah, about a 100 times.
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Mr. Gasket Cataclean 120007 Fuel and Exhaust System Cleaner-16 oz.
This item: Mr. Gasket Cataclean 120007 Fuel and Exhaust System Cleaner-16 oz.
Price: $19.98
Ships from and sold by