I recently needed to smog my car. It was running poorly and I knew it needed some work. So I took it to Smog Check Unlimited. They will diagnose the problem, fix it, and smog it. They called me with bad news. It seems the main computer in my car was bad. It would cost $1500 for the computer & $70 to install it. I told the I could not afford that. I decided to locate a used computer. I found one for $150.00. I gave it to them to install. Then came more bad news. The used computer didn't fix the problem. This seemed strange to me. I told them to put the original computer back in and I would pick up my car. I paid them $161 for diagnosis and installing my computer back into my car. Before I paid out $1570 for a new computer, I decided to get a second opinion. I took my car to another shop. They diagnosed the car as a bad intake gasket. They charged me $240 for repairs and smog. It runs great. They told me the computer is fine. Smog Check won't reimburse me!