Where is the Bank 1 sensor 2 O2 sensor located?

ALASKA907

MEMBER
2008 MERCURY MARINER
V6
2WD
AUTOMATIC
210,000 MILES

The car is throwing a p2270 code which is the 02 sensor, however I can't seem to locate where the sensor is or even a diagram to show where it's located. It is sensor 2 in bank 1 and should be located just below the catalytic converter but it is not.

1 Reply

JACOBANDNICKOLAS

MECHANIC
109,724 POSTS

Hi,

Bank 1 is the side that has cylinder 1. If you stand at the front of the vehicle, it will be on your left. (See pic 1)

Sensor 2 is at the end of the converter. On this vehicle, the catalytic converters are integral to the exhaust manifold. If you look at pic 2 below, I highlighted both sensor 2 sensors. If I am orienting myself correctly with the pictures, the manifold on the left side of the pic should be bank 1.

Let me know if this helps or if you have other questions.

Take care,

Joe

See pics below.

Images (Click to make bigger)