I believe this knock problem can be solved through toyota, if there is a higher enough percentage, then toyota can and will be forced to deal with it. the end results favors the lemmon law, but first, you guys who have the knock, must put maxium pressure on toyota. there is a process that you must follow, to get to arbitration process. first you must inform customer relations of the problem, if you can prove that your truck performs differently than other samples, they have three chances to fix, if not repaired, it goes to arbitration. if you guys had started the process, before venting on the forum, you would be that much further ahead. although this may very well be a quality control problem, the situation can be reversed in your favor, but you must pay the price to get resolution. they are betting that you will sit on your *** and vent on this forum, or trade it off. make up your minds, either you fight or live with it. i went through the full process with dodge, over bad paint, arbitration gave me a new truck. It seems like you guys are puting more pressure on the forum, than toyota. IMHO'