So I took my car to a new mechanic today to have an O2 sensor and a leak looked at (Long story short, the leak is new, the problem with the O2 has been going on and off for a few months now. Fixed a brake line earlier and it took care of the original problem and now it’s back). He hooked up my car and then proceeded to tell me that I needed a new cat. converter and it would cost me $800 for the part alone because the part I need is a high end converter.The guy also told me that I could run my car without a problem even with the cat. converter not working properly. A few things don’t really add up for me. First, he didn’t put my car on a lift, he just hooked it up to the computer and barely looked at it. Is it possible to tell if it’s an O2 sensor problem or a converter problem just by a quick look? Second, I don’t believe that it’s entirely true that I can run my car without issue LONG TERM. What is the general consensus on that ruling?
I don’t care to have “parts thrown at problems”, so in your opinion should I get a second opinion or should I just grin and bear the big repair?