MotorPower Care 触媒コンバータークリーナー — 排出テスト&フィックスP0420に合格| O2センサー、EGRバルブ、排気システムを洗浄 | ガス&ハイブリッドエンジン用燃料添加剤 8.5液量オンス

Got exactly one full year codes free out of this product. Used to get them every month or so. Ordered two more!

Works well as described. Easy directions to follow. Just pour in the gas tank. I would recommend this product. Second time purchasing to keep system clean.

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.

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.

It is hard to know how to review this product, except to say that it did not resolve my problems. My check engine light is still on with a P0420, and my catalytic converter is still not working. Did this product clean my converter? Maybe. My converter is not plugged up, but it really wasn't plugged up before. My converter apparently just doesn't have any precious metals any more. If you are looking at this product to fix a problem, chances are there is an issue further upstream that is causing the converter to underperform - dirty injectors, bad plugs, plugged EGR, or something else causing too much glop to go down the exhaust. Fix all that first, and then clean up the residue with this.