Junk yard is a great place to find parts, but I wouldn't reccomend replacement parts that deal with the engine componants that are questionable unless you know what to look for.
If you do get one from a Junk yard make sure to test it prior to installing it. Chiltons manual says that if you run a Ohm reader set at 1k, and test the positive to ground on the sensor should get a reading of 100k to 600k for a good one.
I recently picked up a knock sensor for a Nissan Frontier at Pep boys for $117.00, so they are a good place to go to get parts. Now if you want them to replace it be prepared to shell out $400.00 and wait for about 4 hours. They have to remove the intake manifold to get to the sensor.
Hope this helps ya.
(I'm looking at tackling this job myself at an auto hobby shop.)
Saturday, October 17th, 2009 AT 2:12 PM