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Discussion Starter #1
On A50 travelling east at 11am the tyre pressure ‘Alert’ displayed. This showed all four tyre symbols and did not seem to 'point' to one tyre in particular. Car was heavily loaded in boot and sun was shining on driver’s side of car. Stopped in lay-bye and tyres seemed visually OK. A proper check 15 minutes later showed all pressures to be as they should be considering they were warm so I re-initialised the TPMS. Maybe the sun caused driver’s side tyres to be temporarily higher than the passenger side tyres to an extent that tripped the TPMS but it begs the questions: -
a) Are these monitoring systems reliable?
b) How sensitive are they?
c) Could the sun shining on one side cause a TPMS alert?
 

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A) Yes, for a while, then no as they deteriorate.

I can't speak for yours but I and many others turned ours off on the 407.
 

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I certainly haven't turned ours off but they don't go off very often for us (last time about 6 months ago I think). When we got back home and the tyres had cooled I checked the pressures and reinitialised the system.

The system works using the ABS sensors and detects a difference when one tyre runs flatter than the others and therefore rotates faster. I suppose that if all were marginally low on pressure but equal then one going high might trigger a warning. There are built-in checks that have to be satisfied before any warning will show (turning a corner, for instance, alters the relative roads speeds)and it's not inconceivable that there's a special routine if one goes high.

Even for the occasional cry of wolf I'd rather have it than not.
 

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Discussion Starter #4
In my case I was cruising (cruise control) in a straight line at 60mph (and had been for about 25 minutes) with the sun shining on the driver's side all the time when the alert popped up. Maybe the sun caused both offside tyres to be a higher pressure than the nearside tyres over a 25 minute period? Does this theory sound possible or unlikely to you wise people out there?
 

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Not really Ken. The tyres on both sides will heat up from the resistance against the road as they rotate anyway.

Maybe somebody adjusted the tyres a smidgeon in the past and didn't bother to reinitialise. They were still in tolerance but then wouldn't need much of a change to set off the alarm. I know I've done the tyres when they're cold and fully intended to reinitialise but just driven off without remembering. More than once in fact!
 

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A) Yes, for a while, then no as they deteriorate.

I can't speak for yours but I and many others turned ours off on the 407.
This is not the same system as in 407, so it will not deteriorate. Sensors are not in the tires. ABS sensors are used to measure rotation.
 
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