The Diagnosis says to get a catalytic converter but I've been doing some reading in hears and it can be a number of things Oxygen Sensor - Mass Airflow,
1. Question is there a test besides the regular Diagnosis test from Auto Zone or Adv Auto or NAPA. Is there a test to check out the exhaust system to see if it is other things beside the catalytic converter.
2. My Check engine light just came on (and Now its off but I still think the problem persists) about the beginning of January so not even a month ago. I know this is important but how long can I get by with it and not cause any serious damage to my car.