Is it green? My car came with a knock sensor. You don't need it.
Looks like you're right about it being the knock sensor. The 2.5L sensor won't fit in the 3L block due to the bolt being too large. The 3L sensor won't accept the 2.5L plug.
If
You do want to use it, you'll have to splice the 3L plug into the 2.5L harness
^^Told ya :laugh:...Isn't that the connector for the Cam position sensor?
^^Told ya :laugh:...
Check that you have connected the mega fuse that goes from the alternator to the battery. Maybe its blown.