I was a loyal customer of Goodyear near me, but then they ran a diagnostic and said I would need a catalytic converter and it would cost me $1200. This sounded outrageous. I got a second opinion from a second shop who ran the diagnostic, came up with the same code but a different solution which cost me $200. The catylitic converter was fine, there was a hole in my exhaust near the converter. Goodyear obviously just ran the diagnostic & never looked at the car. They are a chain, they really aren't concerned about you or your car... just your WALLET.