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Only time mine ever says that is when something like my backpack or case of Coke or something is in the passenger seat. Could be a bad sensor in the seat. Really don't know.
I'll at least chime in. I also agree if I put something in my passenger seat of say 5-20 pounds mine will do the same thing. I would think the sensor is suspect.
It's a protection feature for when a child must be seated in the front passenger seat. If the weight sensor in the seat shows it to be below a certain range, it disables the passenger air bag which can be very dangerous to children or very small adults.