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

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.

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.

Excellent way to clean catalytic converter after check engine light comes on, to pass inspection! Made in GERMANY, rather than China, which is BIG deal for us.

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.

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.

2015 GMC Sierra 170k P0430It turned off the engine check light just for 5 days and 600 miles…Anyway it worked to turn it off, just for a while though.

Worked great in my 2015 F150 with over 250,000+ miles on it.Running strong

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.