Just purchased polished 5 star knock-offs from ebay ($600.00 including delivery). Right now, none of my pressure sensors are reading and I'm getting a check sensors on the computer. When I get the wheels put on, should I put new sensors in as well ?? The car is a 97... Do these things go bad or the batteries go dead inside them ?? Can you replace the batteries ??

 

You need to re-train the sensors. There is a procedure for re-training, but I can't remember the link off-hand.
Maybe someone can pull up the link for you.

 

The batteries CAN and DO go bad and I do NOT believe youcan put new batteries in them.

Try the re-learn process before doing anything else though.

1) Turn ignition on
2) Press "Reset" button in order to clear any IPC display warning messages
3) Press and release the "Options" button on the DIC to scroll through the display options until the IPC display is blank
4) Press and hold the DIC "Reset" button for 3 seconds
5) Press the "Options" button again until TIRE TRAINING message appears
6) Press "Reset" button until the IPC "Learn L Front Tire" message appears in order to begin the programming
7) Install the J41760 Tire Pressure Monitor (TPM) System Programming Tool (large magnet will do) over the left front valve stem
8) The horn will sound, indicating the left front TPM sensor is programmed (if this takes more than 15 seconds, pull magnet back and try again, it will give you three tries. Then you must start over)
9) When the horn sounds, proceed to program the next TPM sensor in the following order as directed by the IPC messages:
-Learn R Front Tire
-Learn R Rear Tire
-Learn L Rear Tire

Programming can be canceled by turning ignition off, waiting 2 minutes with no sensors being learned, finishing all 4 wheels or through the DIC. If the programming is canceled with less than 4 sensors learned, it will only accept the codes programmed up to that point.

 

Sensors go bad, they are battery operated.

Try this site:

http://www.nericreations.com/

He does battery replacement - for less that GM charges for new ones!

 

If you have '97 sensors, it could be that the batteries are reaching the end of their lives (normally they are supposed to last about 5 years or so), but if you didn't retrain your sensors to the car, then that is probably the problem.