I don't know if other customers have complained about these products not working properly. With the price of gas, this has become standard equipment on all four of my cars. They may not stop the thief, but they will deter or make it difficult for me to steal my gas. With caps like this it was easy to install and the "Check Engine" light didn't come on. My other car had it, but it was an easy fix to get the cover installed properly; I live in Oregon and fuel is not a self-serve car option. Read the instructions, go to YouTube and watch them, but they are not buggy. It's like getting angry at a computer when it doesn't seem to be working properly - the computer does exactly what you tell it to do, so it must be operator error!
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