I needed to buy some new tires for my VW Jetta. I went to my local tire store and Bought 4 tires for a fair price. They have sold me tires for my Sprinter Van and my Chevy Trailblazer. My Friend has been using them for years.
I go to drive my car away and the low tire pressure light is on. I drive it home and look to the internet to find how to reset the light. I try a couple of things and no dice, the light is on. While I am filling up with gas I notice that none of the little dust covers are on any of the valve stems. Hmmmm. When I am home I decide to check the tire pressure. OUCH! The rear tires were 10 to 15 PSI low. One front was about 3PSI over and one front was 5 PSI Low. Filled up the tires and the light went out.
I bought some new dust covers. All is well. My wife called and complained.