I got that bank 1 sensor 2 error on my GF's Honda and rented a OBD scanner from Autozone. $200 deposit but you get a full refund when you return it. anywho, it was the O2 sensor in the Cat. Checked around every autopart store in the area and that sensor was $175 - $200. Did some research on the net and found one for $60.
Sensor 1 i would think would be in the headers.