[Ted Stringer]

You are refering to the 2 sensors that are right next to each other at the flywheel, right? That is what was wrong with my car when I bought it. I would replace the sensors, I think that mine ran around $275 for the parts and havn't had any trouble yet.

Now that I read the whole post, There is a way to test them, but I don't know how. It envolves a multimeter but that is all I know. Yes they can be replaced with out removing the engine. It should take you about 3-4 hours to do the job. The connections for the sensors are on that bracket that had 3 sensor plugs on it hiding behind the heater booster blower.