Join Date: Jul 2006
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I'm pretty sure that the tyre pressure sensors have metal valve stems (with coloured rings around their bases).
Believe me, a lot of members get allsorts of doom & gloom warnings if the pressure changes by even a couple of psi - the fact your tyre was at 12 (without a warning) would strongly suggest they aren't fitted.
Also, there should be a sticker on the leading edge of the driver's door indicating the position on the car, that the respective wheels must be fitted, again, if you don't have that, it would confirm the above.
Hope that helps.
This job should never be complete - the day I think I've done it all, is the day I resign.
Currently in VelSatisfied's garage:
2005 FIAT Ducato 2.8JTD LWB Gran Volume, 2000 Kawasaki ZZR 1100 D7 'fullpower' in black + full GIVI & KAPPA luggage, 2007 MB R-Class 320 CDi Sport LWB uprated by Brabus to 300Bhp don't know if there's a 155mph limiter - will be fun finding out! 2004 Mercedes Vaneo 1.7 CDi Ambiente 7-seater