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

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

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

Got a catalytic converter low efficiency code? (P0420 or P0430 - most often) For the price, this is worth a shot. Something not mentioned in the directions that will help this work better: Use it over longer trips so that your catalytic converter has a chance to get up to, and run at operating temperature with this coming through the fuel system. If you add this and then only take short trips, it's not going to be very effective.Also note that the P0420/0430 code often can't be cleared manually, and usually requires one or more successful catalytic self-tests to execute before the code clears. The vehicle usually needs to be ran for at least 20-30 minutes before the test begins.In my case it worked, but the code was just on the edge of cycling on and off over the course of several trips, meaning that the self-test was passing half of the time before treatment.

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.

The catalytic system cleaner showed some improvement, but the results weren’t as dramatic as I hoped. It’s easy to use and might help with minor issues, but it didn’t completely resolve the performance problems in my car. Worth a try, but manage your expectations.

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

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