Most cars built in the last decade or so have a pressure sensor inside each wheel, strapped to the valve or clamped to the rim, and it does not come with the new tyre. It has to be released before the old tyre is broken off, kept out of the way while the wheel is worked, and refitted with a new seal and grommet before the new tyre goes on. Skip the new seal and it weeps air around the valve, which is a particularly annoying way to have a brand new tyre going down within a fortnight.
That is one of the reasons a replacement takes as long as it does even in a hurry. The sensor is looked after, the seal is renewed, and the system is checked to make sure the car is reading the wheel again rather than sitting with a permanent warning on the dash. Then the tyre goes on the rim beside the car, is balanced on the van's machine, torqued to the manufacturer's figure and set to the pressure on the door plate, and the failed casing leaves in the van.
The gap between "needs replacing" and "needs replacing now" is usually a journey you cannot move. A run on the M25 near junction 18 on a tyre that is already down to the markers is not a risk worth taking. Underground parking in Mill End or Moor Park is worth flagging. A Maple Cross cul-de-sac or a West Hyde main road, tell us which.
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An urgent tyre still has to leave the car working properly afterwards, and on a modern wheel that includes the sensor and its seal. Getting that part right is the difference between a new tyre and a new tyre plus a warning light nobody can explain. It all happens where the car has stopped, whether that is a drive in Croxley Green or a verge off the A412.
A tyre replaced on a car near Moor Park had a sensor with a tired grommet. Fitting a fresh seal is what stopped a new tyre going soft a fortnight later.
A car in Maple Cross had had a light on the dash since its last fitting elsewhere. The sensor had been disturbed and never properly reseated.
A failure close to the motorway with the car pulled off. Correct size fitted at the roadside, sensor transferred properly, balanced and torqued before it moved.
Usually not the sensor itself, but its seal and grommet should be renewed every time the tyre comes off. That is where new tyres tend to leak from.
Commonly because the sensor was disturbed and not reseated or reset properly. It is worth sorting rather than living with, since it is your only warning of a slow leak.
They do. The batteries inside them are sealed and last several years, so on an older car a dead sensor is a normal finding rather than a fault caused by the fitting.
Yes, provided there is room to work safely alongside the car. If the spot will not do, you will be told rather than have somebody attempt it.
Typically 30 to 60 minutes across Rickmansworth, Croxley Green and out towards Watford.
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