Originally Posted by
olcoop
If it's using rotations to determine tyre pressure, how is it monitoring the pressure in the spare wheel?
It is probably not monitoring the spare. The only way to do that would be to have a transmitter in the spare and a receiver in the car. IIRC that was how the original TPMS on the early GTIs worked, then some bright engineer realized they could use the ABS sensors to measure wheel rotations, thus saving costs.
So it is up to owners to check the tyre pressure of the spare manually (and going by some of the posts on this forum I'll bet an awful lot of people can't be bothered to do so).
2017 MY18 Golf R 7.5 Wolfsburg wagon (boring white) delivered 21 Sep 2017, 2008 Octavia vRS wagon 2.0 TFSI 6M (bright yellow), 2006 T5 Transporter van 2.5 TDI 6M (gone but not forgotten).
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