Drivers side
Bank 2 sensor is on passenger side of car . Sensor 2 is located to the rear of the exhaust pipe . The last one
Bank 1 on that Town car would be the passenger side of the engine. Bank 1 Sensor 1 would be the first O2 sensor in the passenger side exhaust after the engine but before the catalytic converter.
Left side of car, first sensor towards the front.
Bank 2 sensor 2 is located on the mid-pipe, below the car. That's the only one with a grommet that goes inside the car, below the passenger side carpet.
Bank 1 (cyl. 1-3-5 passenger side) Sensor 1 (first sensor from engine) is accessible from under car. It is located just before the catalytic converter.
the bank 1 sensor 1 is located in the header right before the cat ans is easy to access from the front of the car. bank 2 sensor 2 is located after the cat and the heat shield can make it difficult to turn
The driver side is bank two on that vehicle
Bank 1 (one) is the side in front of car (Bank 2 is rear, firewall side) 02 sensor 1 is upstream, on exhaust manifold (02 sensor 2 is downstream, by cat. conv.)
The HO2S Bank 1 Sensor 1 is located on the exhaust manifold nearest to the front of the car. The Bank 1 Sensor 2 is located on the exhaust pipe before the catalytic converter and after the pipe from the bank 1 and bank 2 exhaust manifolds meet.
I had the same readout on my 1999 E320 using an OBD2 code reader. The Mercedes dealer use a scan tool that is somewhat different; as it indicates right and left side of car; rather than bank 1 or bank 2. The way I figured it all out was to disconnect one of the O2 sensors that were easily accessible under the hood by unplugging the connector and then driving the car for a few minutes. I took a new scan reading and it indicated that the circuit for the O2 sensor that I had disconnected, was not functioning.... since I knew where that sensor was located; it was easy to determine the location of O2 sensor at bank 1 position2. The sensor you need to replace is located on the passenger side of the car , near the catalytic converter. it is underneath the vehicle and can be easily removed using a 22 mm wrench.
On a 1996 Lincoln Town Car : Bank 2 is the drivers side of the engine
I found out today that it is on the driver's side of the car. This matters when you need to know which bank 1 O2 sensor is talking to you.