Are the sensors on the tires themselves? Is it the stem? I feel like the guy on Lost, who had to punch the button or the island would blow up!!!!

 

Sensor/transmitter is attached to the valve stem inside the tire. Each wheel well
Has a receiver. Looks like this.
http://www.suncoastparts.com/product...997_wheelacces

 

The sensor is part of the valve stem-- it's all one assembly that is "potted" in resin with a few holes for the air pressure and transmitter to leak through. I heavily examined mine when I took them all out and had them replaced with simple metal valve stems because I was trying to figure out how to cut them up and replace the batteries-- but it looks too complicated to even try... I just had an indy mechanic disable the warning and I'm running without them. I'm not gonna pay $400+ for them when I meticulously check my air pressure anyway. Has worked fine for 6 months.

2006 c2s.

 

There seem to be so many variations of tpms sensors.

I have a 2007 manufacturered 997 c4s. vin
WP0ZZZ99Z8S720621Can anybody here let me know the model number so i can try to get parts for it ?I think the model of the tpms is Porsche 99760602120 anybody here tried oem ones in ebay? any good ?

Thanks in advance for your advice.