My auto start wouldn't work because the check engine light ...
598468
My auto start wouldn't work because the check engine light was on. Ordered your product, installed it.(which was very simple) It told me because I had a lose gas cap at one time, reset my check engine light off. And Bam.. my auto start works. Thank you so much!!
2849481
My check engine light came on. I took the truck in for a tune-up, changed the oil, sparkplugs and even bought a new gas cap (suggested by electronic printout at the mechanics) nothin turned off the light. The mechanic suggested treating with Lucas. After two tanks of gas treated with Lucas, the light went off.
2405811
It's a  well I should have gone a GM Goodwrench part not compatible lights coming back on
3658039
Failed emission test by P0420. No check-engine-light, used scanner there was pending/freeze frame P0420.
Changed air filter, spark plugs, cleaned mass air sensor. Reset OBD, before EV ready, P0420 showed up again without the CEL light. My tech recommended $380 CONVERTER CHANGE.
Used G2P, and after quarter tanks (4 gallon?) everything was ready without a code, and passed the test.\
After the full tank, the car runs now much more smooth than before.

Thumb up!
572845
Caused my 2010 Toyota Tundra to throw a check engine light.  Put the Fram back in and everything back to normal.
4219198
A blue light turns on for a few seconds while driving then turns back off. I tried different outlets in my car to make sure it wasn't the outlet. I am pretty sure it isn't doing anything.
2422845
I ordered the gas cap because my engine light kept coming on, with the new Toyota gas cap, it pressurized the car properly and the engine light is now off
2771631
A checked engine code came on, on our 2003 Honda CRV-LX. I borrowed a code reader from a friend, who is a professional Honda mechanic. The code pointed to this sensor as being faulty. I bought one from Amazon last month and replaced it. It fits perfectly and after erasing the code, the check engine light is out!

The dealer near our home wanted around $420 for this repair! I bought this sensor myself and replaced it is 15 minutes in my garage!
2484944
I bought this for my 1999 Civic 2-door automatic because it was randomly shutting off on my while driving. The part I received was technically the part number for the 4 door civic, but it seemed to be identical to the part on my car, and so far it works just fine. Here are the symptoms I was having in hopes that it helps you to know if this part will solve your problems:

Civic was randomly shutting off on me, and would immediately turn back on after shifting to Neutral or Park.
Sometimes when I turned the key to the "On" position, the dash lights didn't come on and power windows would not work.
If I jiggled the key while your car was running, I could get it to shut off.
I replaced the lock cylinder, and this did not solve the issue.
51646
My check engine light came on in my 2000 Toyota Camry after driving through mountainous terrain one afternoon. When I brought the car in to get the check engine light test done, it read P0420 which is the code that relates to issues with the catalytic converter and oxygen sensor. So I decided to give Mr Gasket Cataclean a try after reading the reviews here. I followed the directions (drove about 15 miles until the tank was at 1/4 tank, filled it with the Cataclean, and then drove about 14 more miles). I then proceeded straight to the gas station and filled up to a little over half a tank. The light was still on so I disconnected the negative battery terminal to reset it and the light didn't come back on when I started up the car. After that, I drove the car about 200 miles and the light stayed off. I had a second check engine light test done (even though the check engine light was off) and no code showed up. I have driven well over 200 miles and the check engine light has stayed off. I plan to use Mr Gasket Cataclean a couple times a year just for routine maintenance.
1468910
Plugged it in and it worked. Downloaded  Carista app and connected to it. The app told me the check engine code. Just what I was wanting.
1935836
Part didn't work. Put in on vehicle and still got check engine code; when to Advance auto and got the same part and check engine code went off.
2421301
When the check engine light comes on, just plug this in and get the codes for your car and know what you are in for.  Great to not get hoodwinked by some unscrupulous mechanic.  Or maybe, you can just fix it yourself.
818421
so the key chain or the remote don't control the light or work period. is there any explaination for that? the light only comes  on when i start the car.
2612614
Fixed my abs problem, changed the relay out on my 1995 bmw e36 325i and my abs light came off.
278795
The Check Engine light has been on my 2005 Suburban and a code reader indicated two problems, with the gas cap possibly being responsible for one of the faults.  I installed this cap, disconnected the battery, re-connected the battery, and the Check Engine light was still on.  Whether it cleared one of the codes, I don't know yet, but I'm still satisfied that I have a little extra insurance that my fuel will remain in the tank and without any unwanted "additives".
448866
My wife's car had a check engine light showing. I took a shot in the dark and replaced this and it worked like a charm. One of the easiest fixes I've done.