Renault Megane II - Wheels and Tyres - Megane II - Tyre sensors - Page 2 - Renault Forums :: Independent Renault forum

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post #6 of 16 (permalink) Old 6th March 2006
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Originally Posted by nichthewood
Is it me. The "Bl***Y sensors are so sensitive when its cold they come on. if you drive for a mile or so the go OFF.Whats the point.
My previous Laguna II used to do this on very cold winters mornings when the tyre pressures were borderline. The 'fault' would go away after driving for a few minutes.

In my case, it was simply the fact that the tyre pressures do actually reduce as the temperature gets lower. In my experience, it's enough to make as much as 5 psi of difference between a 'cold' tyre and one that's reached operating temperature after a few miles on the motorway. Similarly, the drop could be enough to trigger the sensor.

Tyre pressures should ideally be checked cold, so I'd be inclined to set the tyre pressures and check them with a digital pressure gauge first thing in the morning, while they're absolutely stone cold and the car has been standing overnight. If you have to drive a couple of miles to the petrol station to use their air line, that could put enough heat into the tyres to give a false reading. When they cool again overnight, you end up with the same problem.
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post #7 of 16 (permalink) Old 30th March 2006 Thread Starter
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post #8 of 16 (permalink) Old 3rd April 2006
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All to do with Boyle's Law which states that at a given temperature the pressure and voulme of a gas remains constant, change any one of these e.g. temperature and the volume or pressure has to be increased or decreased to compensate.
post #9 of 16 (permalink) Old 5th December 2006
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Just posting what happened to me and my tyre sensors.

I've got a Megane II 2003 Expression 1.6 16v with the comfort package (airco and cruisecontrol) my tyres are the originals from the car 195x65 15" with the original steel rims.

Last week my service light went on and my right front tyre lit up saying check your tyrepressure. I went to work anyway and when I wanted to go home it said stop, change your tyre (basicly all in dutch, I live in Holland) I went home but topped off all the tires and the problem was gone

Unfortunatly for only one day. This monday it said again stop and change tyre. but my tyrepressure hadn't changed (about 30 psi) I checked the charts and decided that maybe the sensor was at borderline with 30 psi so I topped my front tyres off at 32. No luck.... it still says stop, change tyre.

Anybody got any ideas ? It is getting really annoying and it is quite a long drive to the garage.

L8tr... Tom
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post #10 of 16 (permalink) Old 5th December 2006
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would suggest maybe a faulty sensor, look at the other posts in the forum there, a lot of info. If it does turn out to be a sensor I have seen a set on sale on eBay .

megane , renault , sensors , tyre , tyres , wheels

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