they are somewhat pricyer then i remember 12 14 1 702 163, Knock Sensor $75 each list X 4 you may find them a little cheeper but you are still looking at $250-300 a set, money fairly well spent if you plan to keep the car a good while as a dead one would make you pull the intake again, once you are in there one 13mm bolt and it's out, it's been a while since i did one and can't remember if you can get the left side ones out past the pipe from the water pump, it's close but i can't remember how close

Quote Originally Posted by Eric Clark
I may look into the knock sensors if they do not cost too much. Anyone have cost info/supplier and how hard they are to do when in there?