For the past year and 1/2 our 2003 Rendezvous has had an annoying problem. The warning chime rings once (a few times twice), but no message light comes on. I have checked fluids and tire pressure with no problems evident. Once after it happend twice in a short stretch of RTe 95, I stopped a a Ford garage (only one in the area) and asked them if it was a tire pressure problem. They said it might be a defective sensor somewhere and would be hard to find. Another mechanic I asked had the same opinion. Anyone have a solution to this?