2003 Honda accord TCS light coming on?

The code is reading (P2196 - O2 sensor signal biased/stuck rich, bank 1, sensor 1) any idea of cost?2003 Honda accord TCS light coming on

http://engine-codes.com/p2195_honda.html

$500.00 for a catalytic converter, if it's just an 02 sensor, $75.00 for the part and it just screws in, and the cost of the TCS makes it cost prohibitive ( like a grand per wheel )

The CAT is bolt up and you can get one cheap through bkhondaparts.com

The TCS, well for $4,000.00 I'll bet you can learn to ignore the light.