[Davescort97]

You can test the converter by checking the engine vacuum. If it is above 16 inches your exhaust system is all right. If it's not above 16 inches either the converter or your muffler is plugged up. You can test for which by disconnecting the exhaust system just behind the converter. If the vacuum is 16 inches or more the muffler is plugged up. There really isn't any reason to replace the converter if it isn't plugged up.

I don't have an emissions manual so couldn't tell you how to check the oxygen sensor. It is reccomended that it be changed every 60 thousand miles. If your fuel mileage is at least 28-31mpg and your scanner doesn't show a code for the O2 sensor it is probably all right. If you have any doubts about it, go ahead and replace it.