I had my local garage do their electronic check when my check engine light came on. They said the code they got indicated a failed catalytic converter and quoted me $720.00 for a California compliant replacement, including labor. I live in Connecticut. I’d like to take a few days to get a second opinion and second quote, but the garage manager said that driving it in this condition would risk fouling the oxygen sensor, which I recently replaced for a couple hundred bucks.
Should I be concerned about fouling the oxygen sensor by continuing to drive the car?
Also - I found a non-California compliant catalytic converter online for about $220. Locally a California compliant converter is about $530. Should I try to find a garage that will put in the less expensive part?
I looked under the car and the rear attachment bolts to the converter are rusted beyond recognition. I’m tempted to try replacing it myself but it may be a bit beyond my skills.
Any and all advice is appreciated.