HouseCallAuto 8/26/2010The sensor is threaded into the exhaust manifold. Remove the heat shield covering the manifold, a few bolts hold it on and then replace the sensor under it. You will need an O2 sensor socket / tool. You will need this sensor >> http://www.autopartswarehouse.com/.../BS13455.html Drive-train
and this tool >> http://www.autopartswarehouse.com/.../L1712100.html
Not hard to change usually.