I was referred through a client, told me they are honest, and won't try and sell me something I don't need. She was absolutely right. My check engine light has been on for about a month, so I took it in, they said it was the purge valve. He said I wasn't in a real hurry to fix it, unless it was to get the smog test. I guess all it does is reroutes the gas fumes, so it doesn't affect our ozone. When it's time, I will go back to have them fix it.