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

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

Used it on 2004 Lexus RX330 with 275,000 miles. PO4 light went out and has been off for over a month.

I got great idle from it ,but still testing for how it cleans the catalytic converter ,I am going to order more,I like it!

This stuff works fastPut it in half tank of gas drove on highway for 30 minutesCheck engine light is off and I am happy

Increased fuel economy by 4+mpgP0420 never returnedSome cars will be too far gone for this product to work, which is why theres still some.bad reviews. This product is tried and true to keep your vehicle at peak performance. Use it BEFORE you need it. You will be thankful later when $20 will save you from spending $200-2000. Oil is cheap engines are not

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!

Made my Mercedes run and idle smooth as glass

This Motul Cleaner fixed my rough running engine and smelly exhaust in one tankful of gas. I am very impressed with the results on my Volvo XC60. Use it with about 4 gallons of gas in your tank and drive 20-30 miles and then fill up and add another can of this cleaner. I have been using other fuel injection system cleaners in the past, but none have produced these good results.