P0420 Kit

Great product, It really works when you follow the instructions on YouTube and great price super fast shipping.

The hardest part of all this was getting access to the upstream air/fuel ratio sensor. I loosened it before I ran the engine to heat up the catalytic converter since removing the sensor requires you reach over the hot exhaust manifold. After running the engine and removing the sensor, it was fairly straight forward. Insert the tube into port until it hits the converter element. Then start injecting the foam while moving the tube around to ensure good coverage. Since everything is hot when doing this, where gloves and anything other protection needed to avoid burning yourself. After injecting the entire can, I installed a new upstream sensor and ran the engine. It blew gray smoke from the exhaust for about the first thirty minutes of engine operation, clearing all the carbon that was removed from the converter element. I continued to get the P0420 code over and over and decided to replace the downstream oxygen sensor, thinking that it probably got fouled when I flushed the converter. After replacing it, I have not gotten the code since, with many miles driven. The engine seems much happier now and have seen an increase in fuel mileage. I would say overall, it did what it was advertised to do. So far, very happy with the results.

This product did not work on my 2008 Accord. Waste of money.

MotorPower worked for my 2014 Pathfinder. I flushed the engine, poured the O2 sensor cleaner in the tank. Pulled the upstream sensor out to clean the catalytic converter with the foam. I also used the foam on the sensor and wiped clean. The P0420 code went away for 3 months. This should probably be used every 10,000 miles.

Simply amazing a little extra step but it really makes the difference compared to other more simpler products definitely worth the effort simple enough for anyone to do them selves after watching a YouTube how to do video