Ran into the same problem. The new cam position sensor rides on top of the end of the cam and will not seal. After checking the a couple of part stores in town I ended up at AutoZone. The sensor again looked the same, but the box had a note in it explaining that the new design requires that you tap the cam in to be flush with the engine. This worked for me, the new sensor fits and seals and solved the 54 error I had. My learning.. RTFM