P0136 is for bank 1 sensor 2 (O2S12), not sensor 1(O2S11).
O2S12 is downstream of the precat for the rear (firewall side) bank and is easily accessible from under the car.
Yours is being read by the computer as being dead. I would recommend performing an inspection to ensure that the wires and connectors are not damaged or otherwise open.
About $66 for the correct sensor from AutoZone. Cheaper elsewhere.
Steve
