Liqui MolyCatalytic 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

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

It didn’t clear my check engine light but I do feel a difference in engine acceleration and mileage improvement. So it definitely cleaned the fuel system, just didn’t solve my specific issue. Would buy again.

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

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

I notice less smoke after using this. The build quality of these things are great. The value for the money was very well spent. It was very easy to use and put into your gas tank. This gave me a brighter idea of how my catalytic converter will last even longer. PO420 code has disappeared by itself, haven’t seen it for months. I plan to buy and add another one of these bad boys near the end of the year.

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!

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.