I held down the Auto and Recirculate keys and started the engine. I got code 21 on the display. Anyone know what that means?

Hey....

I had the a/c lite blink on our '02 camry. It was a relay located in the fuse/relay box in the engine compartment. It was the smaller of the relays, grey in color. I found more info on the forums at edmunds.com. The relay was available at the parts store, $55 or so.....good luck. I don't have any info, however, about the code you refer to, if it has anything to do with the relay being bad.........see ya...
kerdog