Liqui Moly Catalytic System Clean 300 ml 7110. Cleans The Injection System and The Combustion Chamber.

Was able to past my inspection, had an error on CAT, one bottle worked. Been driving 55mph trying to hold for 3 mins for about a week and it still did not work, put this in to my tank tried again and passed. Comes in a durable can and the attachment is a huge plus since my car had a capless fuel opening, this was able to bypass the clamps to open out my fuel intake. Very simple to use, but be careful this stuff is not safe to smell very strong fumes. Good value for the money.

This is great stuff! Worked perfectly. Realize that if you get an error code (420 or 430? I forget) for the catalytic converter, the code is simply stating that the efficiency of the converter/sensors is below 95%. So only a 5% reduction yields an error code. The Liqui Moly obviously cleans the converter/sensors to enable a 95% or better efficiency...did it clean only 1% or more? who knows, but my code is gone and I am very pleased with the product.

Works! Amazing! I had problem with bad smell an shifting hard when i accelerate harshly. Now after just one filling i can't find the issue yet and it did something actually!!

Chrysler town and country 2005. Engine light on for months. After add this product to tank. Engine light gone and drive smoother. It is helpful

When used this, you will see that the mpg mileage increase. I used 2 to clean up the engine check light for catalytic converter problem. It works.

Was disappointed in this under-engineered top. Of course the product I guess works great but the trick is to get the cap off without spilling 1/4 of the can on your shirt/sweater/jacket. I’m am extremely mechanically inclined and went to to the screwdriver twice to pop the top. Don’t do that… the whole orafice uncorks like a shaken champagne bottle. Good luck!

My 2011 Ford fiesta threw a check engine light, got the p420 code, and I let it go for about 6 months. Once I started losing power and had some rough starts, I decided to give this product a try. I figured because I let it go for awhile, it might need more than one treatment. I used 3 cans in three fill ups and the check engine light went away. Thussofar it's still off, I used one more can just to play it safe. I will edit my review if it turns on again, and will note the amount of time that it took to turn back on. As of now, it's been off for a week

I amnot sure if it was the cause of my maintenence required light going off but my light did go off about 120 miles ao. I also changed my mass air sensor alsopassed inspection (Mass.) Willadd another bottle just to make sure.