Most drivers assume the tyre pressure light means a sensor has died. More often it means the valve the sensor is bolted to has stopped sealing. On a lot of cars that sensor sits on an aluminium stem with a rubber grommet squeezed under the nut, and the grommet is a wearing part. It hardens, it takes a set, and after five or six years it weeps air slowly enough that nobody thinks to blame it. You put air in, the light clears for a fortnight, and back it comes.
That matters in the small hours because a proper repair means the tyre has to come off the rim anyway. With the wheel bare, the grommet, the seal washer, the valve core and the cap can all be renewed without paying twice for the same strip, so a service kit goes on as part of the job. The puncture is reamed out and sealed from the inside, the wheel goes back on the balancer, and the sensor is relearned so the dash reports what the tyre is doing now rather than what it did last month.
Away from home and a flat overnight is the worst combination, because you have no idea who to ring. A hotel car park, a relative's street, a road you have never driven before, Shephall or anywhere else round Stevenage. School run in Bedwell or 1am in Pin Green, we answer the same. Christmas Day in Shephall, any day in Symonds Green: the line is open.

24-hour tyre repair in Stevenage is part of our wider puncture repair across London and the home counties cover. For 24-hour tyre repair in Stevenage, call 07717 389637 or ask us for a quote.
A lot of Stevenage cars do steady motorway miles, and warm tyres running at a constant speed are exactly where a slow valve leak announces itself: the light appears somewhere past junction 7 and clears by the time you are home. If a warning keeps coming back on the same corner, it is not the dash being fussy. It is a tyre or a valve telling you something, and it is cheaper to catch it parked.
A driver had the same tyre reinflated twice at a forecourt and the warning returned both times. There was a nail in the tread, but the valve was weeping as well, so both got dealt with in one strip.
A night shift finished at one and the car was down to single figures on the drive. We stripped the tyre, sealed the tread and put a fresh grommet and core under the sensor, and the car went out again at seven.
A steel valve cap corrodes itself onto an aluminium stem, then the stem snaps when someone twists hard enough. That is a new sensor rather than a repair, and it is better found on a drive than at speed on the A1(M).
It should, once the wheel is back on and the pressures are set. Some cars relearn themselves after a few miles, others need the sensor waking up with a tool, which we do before we leave. If the light stays on there is something else going on and we want to know.
A new rubber grommet or seal washer for the base of the sensor, a fresh valve core, the nut and a cap. Small parts, pennies each, and they are the difference between a tyre that holds pressure for years and one that annoys you every month.
Usually, yes. It is a sealed unit with a battery in it that runs for years, so unless the stem is broken or the battery has gone flat it goes back on with new seals. We will tell you if it is not talking to the car any more.
That is when it is most worth ringing. We answer 24 hours a day, every day of the year, and a tyre that is repairable at three will often not be repairable by nine if the car gets driven on it flat first.
Not always, but it makes life harder. The gunge coats the inside of the casing and has to be washed out before a patch will stick to anything, and it can clog the sensor as well. Tell us on the phone so the right kit comes with the fitter.
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