General Tyre pressure warning light

[Derbyfella]

Just had this come on in the wifes 16 plate pop. None of the tyres look soft _ and yes i will check, but all i've got currently is a pump with a gauge...

My question is, how likely is this to be an issue with the sensor?

 

[John202020]

The actual tyre pressure is not monitored, unlike the first generation systems, the monitoring is "assessed " by using the abs sensors the theory being a low pressure condition would give a different rolling radius hence it suggest a possibility of low pressure then indicating you need to check?
However a badly worn tyre say and 3 new can also trip the system up, as can a failing abs sensor so check all tyres for pressure condition type etc?
Also two new tyres at the rear and two old at the front could confuse things

 

[Derbyfella]

The actual tyre pressure is not monitored, unlike the first generation systems, the monitoring is "assessed " by using the abs sensors the theory being a low pressure condition would give a different rolling radius hence it suggest a possibility of low pressure then indicating you need to check?
However a badly worn tyre say and 3 new can also trip the system up, as can a failing abs sensor so check all tyres for pressure condition type etc?
Also two new tyres at the rear and two old at the front could confuse things

surely then changing wheel size would also do this?

 

[John202020]

surely then changing wheel size would also do this?

As long as they're all the same then no
It's the constant different rolling rate with respect to the other 3 fully inflated ones that it looks for

 

[lindyhart]

Just had this come on in the wifes 16 plate pop. None of the tyres look soft _ and yes i will check, but all i've got currently is a pump with a gauge...

My question is, how likely is this to be an issue with the sensor?

I have a 2012 Fiat 500 Lounge. Same problem started about five years ago. I had the sensor replaced for $114. It did not solve the problem. I have had new tires put on and it was better, but still shows up for my left front tire. I check the pressure always and I'm OK. I don't worry about it anymore, just a fluke. (a friend who owns a Caddy, said she had the same problem) Guess it happens as the vehicle gets older!

 

[The Panda Nut]

My experience is that the tyre pressure needs to be VERY low before the light comes on in a Panda. Its also that the sensor is right. Tyres at even silly pressures like 5psi may not look flat much at all. I take it you have checked the pressure. If there is still an issue I would be plugging MES in. I did have a sensor fail in a Vectra tyre but that was physical damage done by the garage. My feeling is a faulty ABS sensor would throw and ABS light but its all black electroics magic so who knows.

 

[Derbyfella]

My experience is that the tyre pressure needs to be VERY low before the light comes on in a Panda. Its also that the sensor is right. Tyres at even silly pressures like 5psi may not look flat much at all. I take it you have checked the pressure. If there is still an issue I would be plugging MES in. I did have a sensor fail in a Vectra tyre but that was physical damage done by the garage. My feeling is a faulty ABS sensor would throw and ABS light but its all black electroics magic so who knows.

indeed i did and it was soft. so thats good....but worrying as to when thats gone soft! i probably need an analogue tester too...

 

[The Panda Nut]

indeed i did and it was soft. so thats good....but worrying as to when thats gone soft! i probably need an analogue tester too...

Its worth restating that if the light comes on stop immediately or it may be too late for it to do you any good. AT leastit was genuine and it worked.

My tyre light was when my 4x4 was less than a week old. So I have a repaired tyre which I never really trust even if it was five years ago and I no longer remember which one it was.