I am not a mechanic just a tinker.
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Today, my check engine light came on. (The car is a 2000 Toyota Corolla.) After bringing it to my mechanic, I was told that it was the code for the catalytic converter. He said that it could possibly be the oxygen sensor, so since he would replace both anyway, I should try replacing the sensor first, and see if that alone would clear the engine light.
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That is the problem OBII codes. They don't always tell you what to replace. But what the system "thinks" the problem is. If a sensor is reading incorrectly it may indicate a different problem an O2 sensor indicating a cat problem. This is were a good & trusted mechanic comes in. He must make decisions, do I replace the part or or spend the time trouble shooting, which is more cost effective.
The advice he gave is quite reasonable in my opinion, based on just doing a code check. You didn't state how many mile are on the car if your car is routinely maintained. My self I usually just reset the code and see what happens, the proceed.