2002 honda crv sensor fail

my 2002 honda crv shows check engine light and i checked it with a reader and it shows code p1166 h o2 s b2 s1 heater fail.how can i locate and replace it

Bank 2 is closest to the front bumper. Sensor 1 is before(on top) of the catalytic converter.
To replace it, simply unplug it from the harness, and take it out. very simple

can u explain more please

You have 2 exhaust manifolds. One is close to the firewall and the other is close it the front end where the radiator is. You want the one closest to the radiator. You'll see a metal sensor sticking out of it close to the top plugged into a harness. Unplug the sensor and remove it. Reverse the removal procedure to install the new one

Just bought the vehicle with 91,000+ miles. [As Is with no wqarranty] Shortly after I noticed some transmission shudder. There is also a bit of a whine in OD.
I changed the fluid twice using Honda's own brand. The old fluid did look brown and it obviously needed a change.Please help.