About $185 at the dealer (one sensor). About $100 at a parts store; cheaper on-line if generic. People report that generic sensors fail prematurely; go Nippon denso for quality (factory part).
I just got a quot for a 2003 Sequoia and they said it will be $490 parts and labor. Part $290 Labor $200.
The 2001 Toyota Sequoia's engine produces 315 ft-lbs. @ 3400 rpm.
The 2005 Toyota Sequoia's engine produces 325 ft-lbs. @ 3400 rpm.
The 2014 Toyota Sequoia's engine produces 401 ft-lbs. @ 3600 rpm.
The 2011 Toyota Sequoia's engine produces 327 ft-lbs. @ 3400 rpm.
The 2004 Toyota Sequoia's engine produces 315 ft-lbs. @ 3400 rpm.
The 2007 Toyota Sequoia's engine produces 314 ft-lbs. @ 3400 rpm.
The 2013 Toyota Sequoia's engine produces 401 ft-lbs. @ 3600 rpm.
The 2002 Toyota Sequoia's engine produces 315 ft-lbs. @ 3400 rpm.
The 2006 Toyota Sequoia's engine produces 314 ft-lbs. @ 3400 rpm.
The 2008 Toyota Sequoia's engine produces 314 ft-lbs. @ 3400 rpm.
The 2012 Toyota Sequoia's engine produces 327 ft-lbs. @ 3400 rpm.