CRC Guaranteed to Pass Emissions Test Formula, 12 Fluid Ounce

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.

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 drive a 2010 Honda Pilot and the Check Emissions light came on. I tried every additive I could find to try to clean out the catalytic converters, but alas there was no escaping the costly replacement. I drove the vehicle with the warning for over a year, and while I didn't feel like I was noting any drag or performance issues, once I had the converters replaced, I noticed the improved engine response. I know the sensor was working correctly because in the extreme cold, the error would clear, but as soon as the temps warmed up the check engine light would reappear. It was better to bite the bullet and have the issue corrected, I found. Despite all of the videos on YouTube assuring me I could simply blow my issues out, I was never able to do so.

Sadly, Didn't work for me

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.

Didn’t work for me but maybe it will work for u

This really works if your vehicle does not pass the first smog test. Follow instructions and you vehicle will pass!!!!

My 1997 Chevrolet Venture minivan failed the California smog test for the first time due to high NOx emissions. Doing a search on the internet I found the likely causes to be a clogged or sticky EGR valve, upstream O2 sensor and carboned combustion chambers. The EGR valve and upstream O2 sensor are both the original parts so I cleaned the EGR valve which was a little sticky and replaced the upstream O2 sensor. Lastly, I added a bottle of CRC Emissions Test Formula to the gas tank when it was half full and followed the rest of the instructions on the box. Passed the retest with NOx reduced by 50% from the original readings and HC also reduced. Not sure what the main contributor was in getting a pass for the 2nd smog test but I think a bottle of the CRC Formula was worth it as an added measure especially considering CRC's double your money back guarantee.

It seemed to work. My error code is gone.

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.

I added this to my fuel and it shut off the engine icon on the dashboard for a few days. The light has since came back on so I may need another treatment. Time will tell.

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

Worked as described for a while