Tyre Pressure Drop
Back rear tyre always seemed to want an extra pound or two of pressure compared to the rest, but recently, the warning light came on and pressure had dropped to 17 lbs. Reinflated and 2 weeks later. Warning light came on again.
I couldn't see any sign of object penetration but I knew I had an old valve tool somewhere in the garage that I hadn't used in 15 years. A search located it and I gave the valve a slight tighten about a week ago. Pressure has remained up ever since, so it's worth checking the tightness of the valve insert if a tyre is going down before taking it to the tyre dealer.
Sometimes you get leakage around the beading or the valve seat, but not in this case.
B Max Titanium X 1.0 125 bhp in Magnetic with built in SatNav and rear sensors.