2005 Buick Century Oxygen Sensor Location. The pcm controls the heater element circuit by allowing current flow to ground. Its located on the exhaust manifold, it does require a oxygen sensor socket.
The oxygen sensor on a buick rendezvous is located immediately before the converter on the driver's side. Oxygen sensor heater circuit bank 2 sensor 1 located 05 endeavor. If the engine has been running for about 15 minutes, and if the 02 sensor is ok, you should see the voltages moving between 0.200 volts and 0.900 volts.