Facing the car it is on the passenger side under the car after the cataylic converter
Try to picture this Bank 1 Sensor 1 Bank 2 Sensor 1 Catalytic Conv. Catalytic Conv. Bank 1 Sensor 2 Bank 2 Sensor 2
Just in front of the Cat converter, drivers side.
On exhaust, in front of each cat. convertor
bank 2 sensor 2 location
o2 sensor is on driver side 2nd one back
Trouble code P0140means:O2 sensor ciruit-no activity detected (bank 1 sensor 2)
Bank 1 refers to the side of the car with the number 1 cylinder, on your vehicle it is the rear side of the engine. Sensor 2 is the second sensor, the one after the catalytic convertor, in the exhaust pipe coming from the engine.
Bank 1 sensor 1 is upstream bank 1 sensor 2 is downstream
On a 2003 Cadillac CTS, the high bank 2 sensor 2 (also known as the downstream oxygen sensor for bank 2) is located on the exhaust system. Specifically, it is positioned after the catalytic converter on the passenger side of the vehicle. To access it, you may need to lift the car and look under the exhaust piping. It's advisable to consult a repair manual or seek professional help if you're unfamiliar with working on vehicles.
on the cat by the downpip
bank 2 sensor 2 front bank after the cat
Bank 1 is the bank that sits closest to the front of the vehicle. Bank one is the bank with cylinder # 1. You have 4 oxygen sensors, (bank 1 sensor 1, bank 1 sensor 2, bank 2 sensor 1 and bank 2 sensor2). Follow the exhaust from the head of bank 1. The first sensor you come to is sensor 1, the second is sensor 2.