What prevents the spare tire from reporting pressure on a 2005 Pathfinder.
good question, don't think i have ever been asked this one.the tire pressure is monitored not by a pressure sensor inside the tire on a pathfinder but by the wheel speed, each wheel hub ( the thing the wheel bolts to ) has a speed sensor and the on-board computer is allwise monitoring the wheel speed, if one tire gets low on air it will be slightly smaller in diameter, so this will cause that one hub sensor to allwise read a slightly higher speed than all the other sensors so if the computer keeps seeing one wheel reading a little faster then all the other wheel sensors wile the car is going strate down the road it will them assume that that tire is low on air and turn on the low tire light. now some of your high doller cars do have sensors inside the tires but those cars do not have spair tires ( have you ever seen a spair on a corvett?) and those setups have specal made tires and wheels for this system.....so as you can see the spair is not bolted to a hub so the car doset care if its flat or not, but you will if you ever need it, so ckeck the air in the spair.
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