OBD2 Scanner & WIFI Car Code Reader

First of all, in whatever of my 3 cars I use this in, it mounts backwards - so the lights are facing away from me. That means I can't see when it's connected unless I use a mirror. Second, you usually need to buy add ons for the app to really use it successfully with your particular vehicle. Third, it often disconnects itself. All that being said, it did what I needed it to do. I was using it to clear the MIL (check engine light) and then monitor the results of the computer tests as you drive a specific # of miles. Then you know when you can drive it in for a sticker, before the light comes on again. First of all, I would never do this if the code was somethiing that really needed to be fixed. But in my case it's a code that doesn't really mean much and would require dropping the fuel tank and removing / replacing the fuel pump or fuel pump sensors to fix. That's probably a $1,200 repair. Result, my gas gauge doesn't always work and I use the odometer to know when I need gas. I can live with that. Anyway, I've used this two years in a row to get a sticker. Sometimes it takes driving the car on a few occaisions for 50 or 60 miles. So it eats time, as it is not always successful on your first attempt. This is not a function of the tool, but more of a function of your car's computer. As you're driving you can see the tests happening and you get a green check mark in the app when each one is completed. Please note that in certain states you can have 1 failed emission code and still get your sticker. It's usually the catalyst that takes the longest to turn green. Once it does the app shows that the vehicle is ready for emissions testing. This usually takes 50 or 60 miles, at least. There are many forums that tell you how to specifically drive your vehicle for the quickest and best results. So I won't cover that here. The kicker is to get it to the station after all the codes clear, but before the computer finds the fault again. In my case this means NOT shutting the car off. If I do, and then restart it again, the light usually returns and I've wasted a couple hours of my time. So if you are going to use it for this task, just know that it isn't necessarily quick and easy. It takes time and you need to tell your mechanic not to shut the car off before testing. As I mentioned, all this being said, it has worked for me two years in a row and saved me from an unneccessary $1,200 repair bill. Hope this helps someone.