Quote:
Originally Posted by Zebster
How did you re-calibrate when that option was greyed out?
None of my tyres had lost pressure.
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The light can come on even if all the tyres are at the same pressure. For instance, if you change from light load settings (say 36psi) to economy (39psi) and don't re-calibrate then the light can come on.
To complicate matters it doesn't necessarily come on straight away, e.g. I have changed from winter to summer wheels/tyres, driven around the village for a few days with no problem and then hit the motorway and twenty minutes later the light has come on. Quick pressure test and all 4 tyres are the same, recalibrated, and next time I saw the warning light was after changing back from summer wheels/tyres to the winter ones.
There is no special sensor in the tyres (like there used to be). The TPMS now works off rolling circumference and compares across all four corners and from data history.
If your calibrate button was greyed out, and I'm guessing, maybe you have to leave the car cool down or switch engine off? Check your owners manual is the best advice.