Where is the O2 sensor Bank 1 on a 2005 chevy impala?

There are 2 oxygen sensors on the 2005 Impala, located under the car near the CAT converter.
Jack up the passenger side or onto ramps to make easier access.

Bank1 O2 sensor it is located between the firwall and the middle of the engine, straight down past the spark plugs. Maybe 12 inches from the top of the engine.
The plug for the sensor is clipped to a bracket at about spark plug level.
I recommend using the crow foot style wrench to remove and install.

The Chevrolet Impala comes equipped with two oxygen sensors, one on either side of the catalytic converter. Locating the sensors is as simple as crawling under the vehicle.

1. Location

   • The bank 1, sensor 2 oxygen sensor is located downstream of the catalytic converter. To get to the sensor, crawl underneath the vehicle and trace the exhaust pipe until you reach the catalytic converter. Continue to follow the exhaust pipe until you reach the bank 1, sensor 2 oxygen sensor.The oxygen sensor is mounted to the exhaust pipe and should slightly protrude from the pipe.