Answers: With a vehicle that age and with the miles I would not be surprised that the cat have deteriorated but the sensors could also be bad. Especially when the 02 sensor is within the cat and on those vehicles I reflect on they are. There really isnt a way of determining which one is doomed to failure unless it is looked at by a mechanic. The 02 sensor can be tested and the cat can be checked for deterioration or carbon build up.
There are many components that work together contained by the engine to maintain optimal engine performing and economy.
A service engine soon, or check engine reading light indicates that there is a sensor explicitly reading a condition that is "out of range".
Simply resetting the table lamp does not solve the initial cause of the problem.
Replacing various parts trying to troubleshoot the problem in the hopes of getting the wispy to stay off is a tremendous spend in dribs and drabs of time and money.
The simplest, and most economical way to alleviate your issue, is to enjoy an engine diagnostic done by a reputable shop to determine what caused the computer to signal you to open with. Just reading the computer codes may not find the "cause".
The O2 sensor is in general changed with the grease change rota as this affects the engine performance, as almost adjectives engines are computer monitored in fuel mixture. The cat converter is in general not changed unless you plan to keep the saloon longer than a decade or if you have be using a really cheap gasoline. Exhaust gases can not flow freely if the cat/con is clogged next to the build up of the unclean fuel, approaching the fuel ports or intakes. I changed my cat/con on my 93 Escort and it did improve engine conduct, but since I changed the cat/con, it made sense to change the muffler also.
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