Guaranteed to Pass Emissions Test Formula, 12 Fluid Ounce

Used it as directed. Down to an eighth of a tank. Poured it in and added enough gas to get back to one half a tank. Wanted to get it mixed in really well. Immediately jumped on the interstate and ran 75 MPH for 40 miles. Stopped and filled the tank and when I restarted the engine, the light was off. Coincidence? Not a chance. Light had been on continuously for weeks. AutoZone said I needed a catalytic converter. Nope. One thing I found out the hard way. If your gas filler has a flap at the top, make sure it is easy to push aside. Mine had a little release button near the top that the filler hose would depress before the flap would release. Dumped the first bottle right on the ground. Twelve bucks wasted. No one to blame but me, I guess. Still a bargain, even at twice the price.

My 2005 Jetta failed the inspection and my mechanic said (after clearing the engine light) that I should drive the car for 20 min highway and 20 local. We've tried that the whole day but out of three lights on his device only 1 went away. Next day the light engine came back. After not being happy with the explanation offered by him (a family friend) that I should keep driving it until we get lucky I went online and found CRC 05063. Followed the instruction (one bottle on full tank of gas). Before my tank was under 3/4, engine light went off!! At half tank I went and did the inspection - IT PASSED! I am really impressed! Update August 2015! I have been using this product for 2-3 years now and if it is not working for you please read. In July I have used the first bottle and took my 2005 Jetta for inspection. It failed. Ordered a second bottle and it failed again. My mechanic said keep driving. Did 200 miles in one day and nothing. Decided to take matters in my own hands and ordered Autel MaxiScan MS300 ($18, it allows you to read and delete codes). There were two faults - EVAP and 2nd something about Oxygen. Went online and this is the first time I heard about driving cycles. These are steps that you have to follow so that your car's computer can start measuring all the parameters needed for the test. Driving cycles are not exact science but I tried to follow the instructions as much as I could and after just 20 minutes (10min city and 10min highway) ALL the parameters were set and I passed the emission test with flying colors! So, just before you give a comment about CRC like "tried and didn't work" be aware that there are other things you have to take into account.

I read the specs on this product and it was guaranteed to cleanse as well as turn engine light off in vehicle. I received it March 14.2026 and used it on March 15.2026 I took a picture on Sunday before I entered it into the gas tank engine light was on at that time. Today is March 17.2026 and engine light is still on. The truck was driven for one hour on the 15th 45 minutes on the 16th and 50 minutes on 17 March. Still the engine light is on. Got home parked the vehicle took a picture again to show engine light is still on product guaranteed it was shut it off, but unfortunately product does not work.

Sadly, Didn't work for me

I’ve had this product work before, and it’s been good. This time it did not, and I actually used the warranty/guarantee process and they stood by their assurance and refunded me! I would absolutely buy the product again, my car is a 1995 BMW with <75k miles and it failed CA smog, but using this made it pass before. After the failure this time I had the car checked and it needed an O2 sensor, which fixed it for good, hopefully. But I would absolutely recommend this product to others - if the car isn’t suffering from something major, it DOES work! And the company stands behind it.

I did not pass and followed instructions to the T.

Was highly skeptical about the "guarantee" aspect of this, but figured I would try. Used on a 911 turbo with aftermarket Fabspeed exhaust and ~30k miles. I drive ~3,000/year. Every 12-18 months my check engine light would come on, necessitating a trip to service and what would always be a $400-$500 bill. In my state you can't get an inspection sticker with the light on and I was past due. Specialized mechanic never mentioned this as an option. Put it in and nothing for first half tank and I am getting more skeptical. Next day, start up the car and check engine is gone and hasn't been on since. Don't know what it is but the O2 sensor cleared and I now plan on using every six months.

It worked, 2004 Camry 2.4L 210K miles. CAT not ready by ANCEL AD410 ODBII reading, but no code, no CEL light. The ODBII shows Bank1 Sensor2 #85 is FAILED, reading was 24, below min 76. Used this product as instructed, 1/2 tank, full bottle, drove on highway at 65 mph, with O/D off light on to make engine ran high revolution at around 3000. Now, CAT is ready, but #85 reading is 30, still lower than min required, AI Gemini said it takes a while for #85 reading back to normal .

The engine check light disappeared for two days and came back. Before every time I reset the error code the engine check light would not come back before few days, but after using this product the it would come back next drive.

Simply, absolutely works. Your car will run great again with increased gas milelage too.

works as advertised. I drive mostly around town and the system was carbonized. Vehicles need some highway driving to help clean out the system..

Used product as instructed but after two full tanks of gas used, nothing changed as engine light still on

I tried this to keep my CEL off. I can clear my P0430 code with a code reader and the CEL stays off for a day. This made my code stay off for 2 days before returning. Not was I was hoping, but would work for someone just trying to pass an emissions test. My cat must be no good.