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The A/F Sensor at Bank1 Sensor1 is located on the exhaust manifold, closest to the firewall (rear) of the engine compartment. Usually the best access is goign to be from under the vehicle, looking upwards to the exhaust manifold. There is a tool you can usually rent - Oxygen Sensor Socket) that will make this job much easier. The best bet is a long handle on this special socket for added leverage. Unplug the electrical connect, insert the special tool with a long handle attached, and remove the sensor.
A close-up view of the sensor in the exhaust manifold with the special tool in place:
is the A/F sensor same as Oxygen sensor?
It's a little tight, but you can access the electrical connector from the top.
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