Tyre pressure warning

[Basicbob]

Hi

I got a tyre pressure warning, on checking all 4 tyres are 38

I think I need to pump them up to 45.

Once I’ve done it so I need to reset anything

 

[Jeeves]

Check the sticker on the door shut For the right pressure.

No need to reset anything unless you changed sensors.

 

[Peter 224]

The sensors are sensitive! My M3 LR requires TP to be 42psi. At 38 PSI it flashes a warning. As Jeeves said, once at the correct setting the car is happy.

 

[init6]

You'll also find in this weather there can be drops in the pressure due to the low temp. Last week one side of my car was alerting and the other side (in the sun) was ok. IIRC the manual says to inflate when cold.

 

[Peter 224]

You'll also find in this weather there can be drops in the pressure due to the low temp. Last week one side of my car was alerting and the other side (in the sun) was ok. IIRC the manual says to inflate when cold.

You remember correctly, it does!

 

[MrBadger]

Tyre pressures low pressure range need to be kept within 10% of set point. I use to think the same was true of high pressure but I’m pretty sure I once saw ours on a scorching hot sunny day and long run at 49psi but no warning.

 

[Adopado]

Hi

I got a tyre pressure warning, on checking all 4 tyres are 38

I think I need to pump them up to 45.

Once I’ve done it so I need to reset anything

It'll be fine without resetting anything. Standard pressure is 42 ... but the world won't stop turning if you put in 45 ... some people choose to run a bit under or over.

 

[GeorgeSymonds]

Cold temperature is really ambient temperature because in use they warm up and the pressure increases, how hard you drive, how fast, how long etc all increase the temperature by a different amount. There gets a point there they don’t increase any more but that could still be +2 up on a leisurely 4 mile drive to +7psi if you're caning it for an hour across country. This is all normal and factored into the pressure they want you to set.

Over pressure when cold is also bad, tyres will become even more over inflated in use and either get bouncy and/or wear oddly.

There’s nothing magical here really, on a periodic basis check the pressures and adjust, below 40 and I’d def be adding air, don’t wait for the puncture/flat tyre sensor to tell you, tyres are the only thing sticking you to the road