>>It monitors whatever pressure you set the tyres to.
Most TPMS don't measure/monitor the pressure in the tyre. As already said, they are referred to as indirect TPMS and monitor wheel rotational speeds. The principe is that an under inflated tyre will have a smaller diameter. So pressing the reset button tells the car that the tyres are okay and it will report loss of pressure if the wheel rotational speed changes.
On my last car I went for the full tyre pressure monitoring system which would tell you the actual pressures in the small computer display between rev counter and speedometer. There was an option to say if you were using winter tyres. I went for this because the original tyres were self sealing and I thought one day I might miss a slow puncture. The option was only £120 I seem to recall so cost little in the scheme of things.
However, on the Passat it couldn't tell you the pressure in the spare wheel/tyre (no sensor near it) but the Phaeton tells you the pressure in all 5 wheels/tyres.
Last edited by: rtj70 on Sat 23 Apr 16 at 13:29
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Vauxhall - Tyre Pressure systems 
Vauxhall - Tyre Pressure systems 
