Camry check engine light flashing?

A flashing CEL indicates a more serious fault has been detected by the OBD than a steady on light. You 1996 has OBDII, get a scan soon, very soon

I did one 3 days ago when the light came on. Autozone said 1 of 3 things: Air leak somewhere in the exhaust, O2 sensor or Cathartic converter. Today the light started flashing

P0420 I am guessing. It might just be shop time, unless you are experienced at these things. They have to be eliminated one at a time until culprit is found See http://engine-codes.com/p0420_toyota.html if that is what the code is, or if I am wrong, plug in the code at the same site instead of 0420 and it will help point you on what to do

Your catalytic convertor may be plugged up, or getting hot..they get very hot normally but hot to the point of glowing red, it's running very lean, if the cat is 10-15 years old or 100,000 miles at least, that may be it

Yeah the car is 1996 and 205000 miles.

Those old Camrys and Corollas of that generation are better than the new ones IMO. Take care of her and you will get another 200k

Blinking check engine

Mine was doing same thing acting like it was smothering out with check engine light flashing with over 200,000 mileage it ended up being the charcoal filter which had to be order from Toyota about a 300$ part plus 75$ mechanic fee