While TPMS may indicate that tyres are at their correct pressure - always best to check manually on a regular basis.
Rather than using pressure sensors on individual tyres, the Scala uses a system which measures the differing speeds of each wheel.

A loss of pressure in one tyre will reduce the rolling diameter, hence speed up that wheel's relation to the others.
Temperature changes and general leakage can allow the pressure in all four tyres to reduce by the same amount.
I found recently in cooler weather all four were nearly 2psi down even though my Connect app was showing all was well.

Also do not use alloy valve caps as they chemically bond with the steel valves and require complete replacement.
Can be done by deflating the tyre completely to enable valve replacement - but best not to cause the problem in the first case.

& the TPMS can be triggered not only by a reduced circumference of a tyre, it can be increased because of a binding brake or bearing on it's way out.

And by the time you get a warning as the paramters are wide it could be too late and be ble*din' obvious to a switched on or even dozy driver.

Don't leave the driving or car maintenance to the car's computers as they can't fully be trusted and the responsibilities are fully on the driver of the vehicle no matter how many computer "aids" and "assists" are on the vehicle.

I hasten to add that my car had been stationary for a couple of weeks.
Checked the app before getting to my car and, seeing suspiciously low
pressure, checked them.

The problem is - many don't and rely on "systems".

Off-topic but related

If it's been stationary for a couple of weeks you might need to check the state of charge in the 12v battery, even if the headlights seem bright enough and tghe engine easily starts (the battery has to be very low indeed for the battery not to start the engine on modern cars).

Best way to test is using a multimeter with the probes directly on the battery posts or if you have a battery charger maintainer that gives voltage reading you can us that as it would be a good idea to to fully (to 100%) recharge the battery using an appropriate charger maintainer reading and following the instructions for the caharger and for the car using the car's 'Owner's Manual'. - https://www.skoda-auto.com/apps/manuals/Models

Car 12v batteries like weather at sbout say 20c and IIRC self-discharge (on top of what the car drains from them with its computer systems) twice as much at 30c and twice as much again at 40c, sometghing to bear in mind if the car is statiobnary for weeks during the hottest parts of summer.

It's not just in winter that car batteries arte drained with use either, things like air-con are big electric users.

So even in summer the occassional preventative (low, slow) recharging of the battery, to 100%, can save time, hassle and money.

Or for a stationary car fully recharge it and leave it on a trickle maintenance charge as it's stationary and car unused (but battery still being drained).

Even if the car has proper TPMS sensors, it may not be totally accurate. The BMW is insisting one tyre is 0.1 bar lower than the other, when I’m reasonably sure it isn’t. Still, 600 miles is a long way so maybe it’s gone down - I’ll give it some air tomorrow and see how it goes.

I just messed up. At the Car Wash / Tyre inflators. Increasing pressures of CrossClimate 3,s because going far later and the heat expected. l£1 in and as i inflate i broke the end of the valve / sensor off. I got the valve cap on. 3 Tyre & Exhaust centres within 300 yards and too early for opening and Bank Holiday and not sure which will be open. So got home 1/2 a mile. Neighbour will take the wheel off and get a valve fitted later. So just a suitable new sensor to source & PAY for. I could kick myself if it was not so hot / sweaty already.

2 hours ago, Evolution13 said:

i broke the end of the valve / sensor off.

Most new TPMS sensors have replaceable valve stems.

So no need for a new sensor, so long as the garage has one.

There are over 40 different types! 😯

Thanks. AG Falco

On 22/05/2026 at 10:40, grahamebath said:

I hasten to add that my car had been stationary for a couple of weeks.
Checked the app before getting to my car and, seeing suspiciously low
pressure, checked them.

The problem is - many don't and rely on "systems".

and of course, if the car has been standing for a while the car system will only have the last "driven" record to go by, if like the Scala the car recognises the ABS ring to work out the tyre "size/ inflation"

On 22/05/2026 at 10:27, nta16 said:

And by the time you get a warning as the paramters are wide it could be too late and be ble*din' obvious to a switched on or even dozy driver.

I find on my Superb it's pretty sensitive, I recently got a warning saying one of the tyres had low pressure, upon checking it was only 2psi down from the other three, I would consider that reasonably accurate, pretty close parameter wise (based on wheel rotation - I don't have the active TPMS).

Having said that I would consider having the direct system option on my next car if it's not standard (depending on the option price), currently £155 on the new Superb.

Regarding Tyre Pressure Sensors, it should be known that these sensors are battery powered, and eventually, these batteries are kaput. To replace 2 in my last car, an E class MB, cost €180 for 2 sensors....therewas the usual yellow warning icon on the dash, but when examined by the tyre fitter, a 2nd sensor ready faulty also...

Valve Stem kits for the Sensors are from £6 to £12 or so. Replacement sensors for my MG showing from about £25-£100. Just not got to my one yet to see what is what. When my Electric MINI was in at the BMW Dealers for it's service and Recall Actions i had on the winter wheels and tyres with no Sensors (i could have ordered with sensors @ just £155 extra) and the warning showing on the dash when at BMW. On the report it itemised TPMS,s required and quoted £2,500. EDIT. Fixed just valve stem kit needed, done for free by a mate.

Edited 28 May28 May by Evolution13

1 hour ago, cnc said:

I would consider that reasonably accurate, pretty close parameter wise (based on wheel rotation - I don't have the active TPMS).

Good to know, perhaps someone improved the system from 2015 to 2022, or more accurate on bigger wheels, or the Supeeb got a better computer program than the Fabi, but I doubt it, and/or any combination or permutation, or perhaps the system on the 2015 Fabia is slower reacting to a faster deflating tyre - good to know it's was my reliable for you.

The tyre pressute monitoring system I always recommend is a small amount of time and common sense about when to check, no it doesn't work in real time driving but that's where training (learning to drive rather than just to pass a one-time test), experience and common sense have to be used, fine if that's also backed up by a reliable computer system but the computer system needs to be checked and if required questioned (like all systems, especially computer ones now).