Buying tyres for a car with pressure sensors means buying something else at the same time, and it rarely gets mentioned at the point of sale. The sensor is a small module clamped to the inside of the rim at the valve position, and it does not come off with the old tyre. It stays with the wheel. What does have to be dealt with is the sealing hardware around it, which is disturbed the moment the tyre is broken off the rim and is designed to be renewed rather than reused.
That is the service kit, and on a full set it is four of them. The sensible time to have them is before anybody starts, not halfway through a job with the car in pieces. The other thing worth settling in advance is the age of the sensors themselves. They are sealed units with a battery inside that lasts years rather than forever, so on a car old enough to be on its third set of tyres at least one is usually approaching the end. Having all four wheels apart anyway is by a distance the cheapest moment to find that out and decide what to do about it.
Two things have to be true for a tyre change to be painless. The first is that you chose the tyre rather than took what was in stock. The second is that you did not have to give up half a day. Both are ours to sort out. You pick premium, mid-range or budget on the phone; we bring it to the car in NW10 at an hour you agreed to and fit it where it stands. Car parks, driveways in Roundwood and kerbsides are all the same job to us. Balance included, valve checked, pressures set, old tyres taken away.
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Plenty of cars around the Walm Lane area are on their second or third set of tyres with the original sensors still sitting in the wheels, which puts those batteries well into the back half of their working life. That is worth knowing before the day rather than during it, because the difference between a planned decision and an awkward one is usually just the order the information arrives in. Tell us the car and its year when you book the tyres and the right kits come out with the set, so the whole thing is finished in one go at the kerb.
A set booked for a driveway up on Dollis Hill went out with the sealing kits already loaded on the van. Nothing had to be found halfway through, and the car was finished in a single visit rather than two.
One sensor on an older car had corroded where the nut meets the stem. Taking that apart slowly rather than quickly is the difference between a fresh seal and a snapped stem with a new sensor to pay for.
With every wheel apart for new tyres, one of the four sensors was reporting only intermittently. Dealing with it there and then saved a separate appointment a few months later, and the dashboard stayed quiet afterwards.
Not usually. The sensor lives in the wheel rather than in the tyre, so it stays put while the tyre is changed around it. What does get replaced is the sealing hardware holding it in, and that should happen every time a tyre comes off, on every wheel.
The small sealing parts around the sensor: the washer or grommet between it and the rim, the retaining nut, a fresh valve core and a cap. They are consumables. Once they have been clamped up and then disturbed they do not seal as reliably a second time, so they get renewed.
They can, but the car has to be told, because most systems learn which sensor sits at which corner. We keep each sensor with its own wheel unless there is a reason not to, and where a system needs telling, that happens before we pack up rather than being left with you.
You get told and you get the choice. A sensor is a sealed unit with a battery, so a failing one is replaced rather than repaired. Doing that while the tyre is already off the rim is the only version of the job that is not a second appointment on another day.
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