changing the sensor is easy. The hardest part is removing the top of the intake from the lower half. Three bolts and you can pull it off and flop it to the side so you can get at the connector.
While you are there, spend the $15 and get a new gasket set from the dealer for the manifold joint. Might also want to check the vacuume lines while you are down there. The lines that run from the injectors to the intake will run you about $50 |