1. A 60's Corvette had a panel in the wheel-well to use to get to the spark plugs.

2. The 90 Lumina sedan required one to unbolt half the engine mounts and rotate the engine up 30 degrees to get to the back three plugs- or even get the wires on. This one also had 2 computers and 3 coils for high voltage ( spark)- all of which get replaced when there is a problem.

3. My old 72 Charger had a 400 cu in. engine- which required the removal of the exhaust manifold on the driver's side to get to the rear two sparkplugs.

Has anyone else heard about the problem with the Prius? It seems a main battery cable runs inside the frame over the door- and presents an electrocution hazard to rescue workers who try to cut through to get the driver out.