8931 Catalytic-System Cleaner, uncoloured

This item works! Check engine light is off in both my 2012 Jeep liberty and my 2005 Nissan...and have stayed out for 6 months and havent come back on every few weeks like they were both doing. Both passed smog with no problem after driving around for only 35 miles...... . check engine light went out. Mechanic wanted 1600 bucks to change cat in my Jeep. Finally I feel we got something for our mony!

It works

This worked great to keep the catalytic converter warning light off for several months. Be aware that it has to be sprayed into the air intake with a spray bottle, not just poured into your gas tank. It has to be sprayed into the intake downstream from the oxygen sensor, while the engine is warmed up, and with a helper keeping the rpms revved up while the first person sprays it in.

I'm generally very skeptical of automotive additives and research everything to death. The general consensus on catalytic cleaners was that they don't work. My 2017 Expedition threw a code for P0430, which indicates the Bank 2 catalytic converter is not functioning properly. Swapping in a new O2 sensor did not work. My next option was to replace the catalytic converter. On a lark, I decided to try this product. I figured if it didn't work, I was only out $16. I have software that reads information from the vehicle, so I can see what numbers the catalytic converters were generating on each side. Surprisingly, after one application, the numbers improved enough for me to pass my emissions test. I was prepared to be told it failed because I was unsure what the threshold for passing was. But instead it passed and the check engine light has stayed off for the past several hundred miles. I deducted one star because Liquid Moly has another very similar product that is added to the gas tank, while product this must be sprayed into the air intake. I accidentally purchased that other product first because the product packaging is too similar and use instructions can be confusing.

It doesn't work by itself, it requires at least two person and a special pump spray bottle that costs $68+, and that information is not written on the description of the product. Worst: it isn't eligible for return, so you get a decorative can.

Excelente calidad como siempre los identifica

I was hoping this would help clear a partially clogged catalytic converter that kept setting off codes in my Chevy Malibu. After reading the application instructions and viewing an application video, I realized this is intended for race cars - or at least that’s what they showed, and requires as specialized mixing bottle to atomize the material before getting sucked in through a vacuum port. One source on the Mfg’s web site said you could put it in a spray bottle and apply a fine atomized mist through the throttle body intake of a vehicle. I attempted that with limited success (having to disconnect my Mass Air Flow sensor - before starting the car - and spraying it into the air intake housing). I tried to rev the engine while spraying the contents into the air intake, but I think most of the content just puddled somewhere. I was hoping for some sign of it working while spraying but didn’t see any. Then I buttoned everything back up and took the car for a ride and produced a HUGE black cloud of exhaust in the first 50 feet of travel. I then heavily accelerated hoping to push all the cleaner through the system but think it was a quick one-shot deal at the beginning only. It may have done some good because my trouble code hasn’t returned yet, but it usually takes several weeks of driving to see it return after clearing. I doubt I properly applied the product, but also don’t think it is reasonable for the average Joe to be able to properly apply this product, so am not scoring it very highly in this review. Maybe someone else could get much better results.

Used in a 2012 Prius with almost 300,000 miles, the cat below threshold DTC light was coming on. I put this through the hose from the valve cover before the throttle body with a small pump up sprayer I got at the hardware store, while it did look like it was cleaning gunk out of the cat it did not solve the problem, the light continued to come back on with the same error code. I took the car to Toyota and they are in the process of installing the 2 new cats they said it needed, about $2,500 here in California. I also used it in a 2003 Chevrolet Tracker 2.0L with about 85,000 miles and no CEL. I was able to use some clear tubing to hook it up to a plugged vacuum fitting after the throttle body, I did not see anything coming out of the exhaust but the car seems to have better acceleration. I bought 3 bottles and poured all 3 in the sprayer. Still have some left for next time. Seems like a good product though not always a cure all.

Lo compré porque se prendió el código 0420 lo apliqué en el cuerpo de aceleración borré el código ye tiene 3 semanas y no ha vuelto a parecer el código si vuelve a marcar el código modifico mi reseña

Marque connu, et produit efficace pour un prix raisonnable.

Good and working

Producto preventivo, usar con pulverizador directo al ducto de admisión! No se usa vertiendo en el tanque de combustible.

I used this on our L650S Mira Gino because the fuel mileage was bad. I bought a cheap sprayer to spray the liquid into the throttle body while the car ran. It created a lot of smoke. Following the treatment, I replaced the oxygen sensor after the catalytic converter. The car seems to have more power and is getting better fuel mileage!