MotorPower Care Catalytic Converter Cleaner — Pass Emissions Test & Fix P0420 | Cleans O2 Sensor, EGR Valve & Exhaust System | Fuel Additive for Gas & Hybrid Engines, 8.45 fl oz

I followed the easy instructions and after about half a tank of gas later my check engine light went off. I've seen quite a few that are way too expensive but this has a very decent price. So it worked wonderfully. It didn't leak while shipping. Overall a great product that might save you the cost of a catalytic converter

Bad coil on a 1999 V6 Toyota Solara coupe with 235,000 miles caused check engine light to come on (occasionally flashing) and engine to run rough for months. P0300 "multiple misfire" OBD code. Got progressively worse. Finally replaced the coil cuz a smog check was required for upcoming registration. Replacing the coil fixed the issue. Engine runs great. Check engine light was reset and did not come back, but smog check failed. Used this with 1/4 tank and drove til nearly empty to get rid of as much additive as possible, then added half a tank of top tier premium and drove for 1 hour. Passed smog by a wide margin. I can't confirm this product actually did anything, maybe the car just needed to be driven hard to clear out the carbon but you can't argue with the result! Oh yeah, recommended to a friend with a Kia mini van that wouldn't pass smog and also had a check engine light. Same procedure worked for him too.

I have 2008 Subaru with 180k miles. It was running ruff and loosing power randomly. Check engine light, emission codes. Took care of it. I did do a 2nd treatment. And used with 1/4 tank. My wife’s car 80k miles would miss occasionally. Changed plugs and wires. No luck 1 bottle took care of it.

Had a P0420 code on my 2009 Chevy HHR. Added cleaner to about 8 gallons of fuel, got on the freeway and drove as fast as I could for about 12 miles, stopped and added a few more gallons of GOOD fuel, started the car and the check engine light was OFF. I think the problem was aggravated by using cheap fuel. I recommend using top tier fuel only!

I put this in a half a tank of gas ran it and had no light come on. Turned the car off and came back out 30 min later. Started the car and the light was back on.

No positive results as expected.

Worked

Seems to be doing the job.

Works! 2014 Subaru Impreza with 280,000 kms on it was throwing a P0420 (Catalytic converter efficiency) - poured this into the tank that had about 15 litres. The error was gone after driving about 20 kms.

it really works! Pour it in and go for a hour drive and "Pass"

Did absolutely nothing. Code still present. So disappointed what a waste of money

It works pretty well, I can see some difference on my engine running.

I can't say for certain whether the product works or not. I used two doses of it each time to the correct amount of fuel. Sadly there was no change to my catalytic code. I can say that whoever prepares the cans for shipping does a very poor job at sticker placement. It was very frustrating trying to peel off the label SKU code that they apply on the can with a very sticky adhesive... right over top of the instructions!