I've got a 2004 Liberty (3.7L), and a few days ago I had all the tire pressure sensors changed out. From what I've been told they should just need a little bit of driving before they'll start reporting pressures, but that hasn't happened.

My drive home from the shop wasn't far, so I took it out yesterday for about 60 miles. Nothing. All 4 sensors have blank lines next to them on the display, and the warning light is still on. It came on a couple times while driving around, and that's not something that previously happened with the original sensors.

Any ideas? I can take it back to the shop if I need to, but I'm not sure if I'm just missing something obvious here.

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Edit: I forgot to mention that the shop already went through the retraining procedure. I'll try it again to be sure though.