K ive had the stock 17s 235 55 17 pirelli scorpions...1 tire had a slow leak coming from an old plug...had it double plugged, still slow leak, decided to get new tires. Went with Pirelli Pzero Nero 235 55 17 right off the bat, these tires are softer (ride is less bumpy) and quieter (granted the tires i replaced had 45k miles and was wearing okay. Now my issue with the tpms is the light has come on obviously from the 1 slow leak, filled up a couple of times and resetted with the button on the center console. Today i changed the tires at work...to my suprise NO sensors in the wheels?! So of course on my way home from work, tpms light comes on, i recheck tire pressures everything is at my set psi...hold the button to reset tmps and light still stays on. My question is where exactly are the sensors??

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2004 BMW X3 3.0i - 2/08
1995 VW Passat VR6 - 1/09
2004 Nissan Maxima SE - 4/07-2/08 68k
2006 Nissan Pathfinder SE - 12/05-4/07 36k
2003 Ford Escape XLT - 10/02-12/05 70k
2000 VW Jetta 1.8T - 7/00-12/05 - 130k
1997 Honda Civic EX - 2/97-7/00 - 95k