A tyre pressure warning light came on this morning as I set off. The screen told me which tyre - front passenger side - it looked ok and when I checked it the pressure was fine - if anything a bit high.
Is it possible that it’s giving me a false reading because of the cold weather - just above freezing first thing. Still showing the message late morning and the temperature has improved somewhat - now 8 degrees.
It could well be a problem with the sender. It’s worth checking the other tyres. I once had my tyre pressures adjusted by a garage when the car was being serviced and the front tyres we’re overinflated by a fair bit. They could have lost a lot of air but still been above the expected pressure.
They all look fine - but fair point, I’ll check the others after lunch.
How old is car? What type of TPMS is used?
If car is 5 - 10 yrs old and uses self powered sensors, it could be battery.
I’ve had my Duster’s tyre pressure warning light come on at start up on cold days where one wheel is in the sun and the rest aren’t.
My trusted tyre pressure pencil agreed with the Duster as the sunny tyre was 5 PSI above the rest.
Five minutes driving and all showed the same pressure.
On my car there’s a way to set the tyre pressure warning when the tyre pressure is ok, so that it knows what is normal and then warns when it’s not normal. I’ve never actually worked out how to set it. Maybe that’s your problem?
I’ll investigate further.
Unfortunately the warning light is still on.
2 year old Kadjar.
There are, as far as i know two systems - either the ABS wheel rotation sensors are used to sense if one wheel is consistently rotating a different speed to its twin or individual sensors in each wheel (which are normally battery powered).
The instructions to reset the system on the Kadjar (check the pressures first) seem to be:
New technology 
not like the good old reliable cruise control 
Thanks Billy. I’ll have a look at it tomorrow morning and report back.
Our recent trip your way was marred by warning lights coming on. I forget exactly which but I think oil pressure. To cut a long story short the issue was that the car’s computer system had not been updated as it should so was a big fuss about nothing.
Same thing happened to me on a motorway, I pulled into next service station and checked pumped up tires if needed and the light stayed on, later on in the week I popped into a garage and they just pushed a couple of buttons on the inboard control panel to reset, they showed me how to do it myself but forgot, as I don’t want to be messing with company cars.
It’s probably a reset thing or a sensor.
I had this on one of my tyres last week when the temperature dropped suddenly to -5°C overnight. As the cold nights continued, the alarms on the other tyres came on when starting the car in the morning. In the end, I put a bit of air in all of them, and then changed them this week for winter tyres anyway ! All of this just to say that it could be due to the cold, much as it could be a slow puncture or a faulty sensor.
This is good advice.
Im having one replaced. Price is only €35 plus fitting and setting.
The way most of these gadgets work is not by warning you about what the absolute pressure in a tyre is, but warning you when the pressure varies by a certain amount from when the last ‘reset’ was made. The value of the ‘certain amount’ is pre set within the vehicle computer.
To begin to work out what the problem is, all 4 tyres should be inflated to the correct pressure and then a ‘reset’ made. Only when a warning sign comes on after that will you know there is a problem and on some vehicles, which wheel/s has the problem.
The “joys” of modern car electronics.
OH checked round all the tyres - all seemed ok. Whereupon the driver’s side warning light then came on - so now I’d two tyres seemingly with pressure problems.
I set out for town and within 2 minutes had the car screaming at me that I had a puncture in the driver’s tyre and to stop immediately. So I cautiously drove back home.
We checked the pressure again, left it for about half an hour and decided there might be a slow puncture, so changed to the spare tyre and I drove into the garage. They checked the tyre in a bath. No evidence of a puncture but we agreed the valve would be changed, just in case.
He put the tyre back, reset the computer for me, drove the car round the block and said all was well.
We shall see!
Err, in the Kadjar the tyre pressure monitor is integrated with the valve.
Looks like this
So did “change the valve” mean “new tyre pressure monitor” or "no tyre pressure monitor?
Anyway, if you wound up with a new sensor that might explain why it works now 
He just showed me the tiny little needle thing that sits inside the valve. So no, pressure monitor not changed.
If the pressure was going down slightly and no evidence of a leak in a tyre bath, then he did the right thing. Highly unlikely it is the sensor if the car is only two years old.
9am this morning, -3C taking my Alpine for its CT and the tyre pressure indicator came on. Not really surprised but then a mad dash into Leclerc to buy something to get a coin to be able to use the air machine at the Leclerc fuel station. Tyres inflated a bit more than usual as they were showing low at -3C. Glad to report the car passed 
