tyre pressure monitor think (again!)
Discussion
we've recently switched to normal tyres after a recent puncture/worn outness of runflats.
the wife said this morning the light came on. she went to garage checked presures and they were at low end but still 'within operating range' as it were. reset it and drove about 15 miles and it didn;t come on again.
any ideas? low cold pressure? could something be up with a sensor?
the wife said this morning the light came on. she went to garage checked presures and they were at low end but still 'within operating range' as it were. reset it and drove about 15 miles and it didn;t come on again.
any ideas? low cold pressure? could something be up with a sensor?
Hi there!
The tyre pressure monitor isn't actually a pressure monitor as such, there are no pressure sensors.
Instead this system uses the wheel sensors to check wheel rotation speeds (The same sensors used for the ABS etc). If one wheel on average rotates faster than the others then it is suspected to have a flat tyre and the warning lamp illuminates.
After a tyre change, it is normally recommended that the system is reset so it can re-learn.
The tyre pressure monitor isn't actually a pressure monitor as such, there are no pressure sensors.
Instead this system uses the wheel sensors to check wheel rotation speeds (The same sensors used for the ABS etc). If one wheel on average rotates faster than the others then it is suspected to have a flat tyre and the warning lamp illuminates.
After a tyre change, it is normally recommended that the system is reset so it can re-learn.
I would suggest you just press the reset button and leave it at that, you now have the advantage of the sensor warning you at a tyre pressure of approximately 24 PSI. This is because the walls of a none runflat tyre are softer, I believe the sensor sees the flex in the tyre wall, a runflat has thicker tyre walls and flexes less therefor the sensor reacts at about 6 PSI, you could be driving on an almost flat runflat for weeks and the inside of the tyre will be totally knackered, this is the reason they cannot be repaired, the inside of the tyre is destroyed.
I have just changed my granddaughters 17inch runflats to standard 17inch Falkens, the indicator came on as said at about 6psi on runflats, it now comes on at 24psi, the only difference between the tyres is the thickness of the walls.
I have just changed my granddaughters 17inch runflats to standard 17inch Falkens, the indicator came on as said at about 6psi on runflats, it now comes on at 24psi, the only difference between the tyres is the thickness of the walls.
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