You can reach this oxygen sensor by removing the throttle body inlet from the air filter, and the various hoses witch attach to it. The connector for the O2 sensor is very visible on top of the bell housing. The sensor wire is about 9" long. You can feel the sensor ( I couldnt see it} and use a sensor removal tool to remove and replace it. It helps to have long arms and it is very hard to loosen. Took me about 15 min to change and I did check for heater continuity before I changed it {no continuity on the heater circuit.-two white wires. Code would pop up imediatly after clearing on start up when it was bad-assume that shows bad heater circuit which is caught on start.

 

Thanks for the info.