[klwood2000]

I confer for the locations of the sensors on my '99 Grand Caravan. The part number ending in 9 is located under the battery behind and under the air filter on the Drivers side of the vehicle. The other part ending with an 8 is to the left about 8 inches directly under the transmission hoses. Normally the sensors are white, but mine were all cruddy, so you will need to wipe them down. I paid $27.17 each at the local dealer and used a 1" socket from Sears ($10.62) and a convertor for my 3/8" ratchet. Worked like a charm. Had to remove the upper air box and the lower filter box and cover to get direct access. Once there, I got on to both and pulled them out. Very simple job and it worked! I was sweating a $2000 rebuild.
If anyone needs pictures, please e-mail me at klwood2000(remove this)@gmail.com and I will send them to you.