After 12 weeks, the knock sensor was replaced by Woodfield Nissan, under warranty so I get the initial $107 back I paid. The truck works fine now. Covered under the 5 year, 60,000 mile emissions warranty (which is different from the extended warranty. ) This has been the biggest PITA ever. Nissan Corp. sux big time.

I wish I could convince my dealership that it is the knock sensor and not the tires! :rolleyes: