Low pressure tyre warning

[securespark]

After many journeys where His Lordship (the car) has announced issues with the tyre pressures and Mrs Secure has a shouting fit with the car, I persuaded her to go to a filling station and I pumped up the tyres to 2.6 bar all round. Then we went for a drive until all the amber dash warning lights went out.

Hopefully now we won't get any more bleating...

 

[the2ems]

Or reset the TPMS first thing in the morning when the tyres are cold and at their lowest pressures.

How do you reset the TPMS please?

 

[MG Clive]

How do you reset the TPMS please?

Unlike on many other vehicles, you can't manually reset the TPMS on the MG4.

 

[Tight Git]

How do you reset the TPMS please?

Put some air in and drive half a mile or so...

 

[the2ems]

Put some air in and drive half a mile or so...

Bit random innit. You don’t really know if it’s reset

 

[Tight Git]

Bit random innit. You don’t really know if it’s reset

I assume you've just had a low tyre pressure warning for the first time? It happens when the weather cools down and there will be loads of people thinking they've got a fault, when in reality it's just they are very close to the threshold and the temperature drop triggers a very slight drop in pressure and the warning.

 

[the2ems]

A couple of warnings on my daughter’s car over the last couple of weeks. Some were 1 tyre, some were 2 tyres. I checked them all this morning and 2 were at 32psi, with the other 2 at 31.5psi. They are supposed to be 37psi. It’s the first time they have been checked from new a few months ago.

 

[siteguru]

A couple of warnings on my daughter’s car over the last couple of weeks. Some were 1 tyre, some were 2 tyres. I checked them all this morning and 2 were at 32psi, with the other 2 at 31.5psi. They are supposed to be 37psi. It’s the first time they have been checked from new a few months ago.

Therein lies the problem - tyre pressures should really be checked weekly; certainly before a trip of any distance. And it's not exactly hard to do - the pressures are shown on the car screen.

 

[the2ems]

Therein lies the problem - tyre pressures should really be checked weekly; certainly before a trip of any distance. And it's not exactly hard to do - the pressures are shown on the car screen.

I know. But not so easy when it’s a girl who doesn’t understand all that technical stuff. Where abouts on the screen are the pressures shown?

 

[Tight Git]

I know. But not so easy when it’s a girl who doesn’t understand all that technical stuff. Where about son the screen are the pressures shown?

Press the 'page' button on the right of the steering wheel (middle one of the 3 I think) and scroll right or left to get to the tyre pressure page.

 

[salty]

38 psi all round on the X Power (18s)
I always put 40 psi all round. You always lose a tad, when disconnecting the air valve. Works well.

 

[Phil]

262kpa/38psi for me, our -4deg mornings will drop that to 240+ but after a short drive it gets up to 260 pretty soon. I had one rear tyre that seemed to very slowly go down and eventually I had it seen to. Tiny leak from a hole in the tread…fixed, and now perfect.
Road trip north to warmer climate (Brisbane) and tyres got to 280kpa but car was reaping efficiency dividends from that.

 

[ReintjeWA]

I’ll put it up to 2.8 bar on a crisp morning, a long drive will see the temps come up to 3.0 (rarely even 3.1) and 3.0 is what the dealer put in, so pretty happy with that. I’ve always preferred a bit more air in the tyre.

 

[Phil]

I’ll put it up to 2.8 bar on a crisp morning, a long drive will see the temps come up to 3.0 (rarely even 3.1) and 3.0 is what the dealer put in, so pretty happy with that. I’ve always preferred a bit more air in the tyre.

Always liked 40psi in my Hilux and the 38psi in the MG4 is not far off that make given it’s a few hundred Kgs lighter.

 

[Everest]

Therein lies the problem - tyre pressures should really be checked weekly;

A couple of warnings on my daughter’s car over the last couple of weeks.

I know. But not so easy when it’s a girl who doesn’t understand all that technical stuff.

Really?.. and to quote @siteguru... therein lies the problem. My dad taught me to check tyre pressures, oil and water levels and how to top up the screen wash when I got my Morris 1100 to learn in, when I was 17. I don't think "being a girl" is any excuse for not knowing how to check tyre pressures. It's not that 'technical' IMHO. In my day we had to unscrew a cover and press a tyre pressure gauge firmly against the valve. Dirty yes, but not technical.

 

[Alb]

I taught my daughter how to change a wheel at the age of 17! There's a difference between not wanting to do something and not being able to do it.

 

[the2ems]

I taught my daughter how to change a wheel at the age of 17! There's a difference between not wanting to do something and not being able to do it.

Exactly

 

[ReintjeWA]

I’m sure the current generation of new drivers can figure out a tyre pressure from a screen in the car, if they have the attention span to do so

 

[the2ems]

Can someone explain this to me please? So there is lots of threads on the subject of tyre pressure warnings, and there are people saying that’s it’s related to temperature, and other people saying they put an extra couple of ponds in and it doesn’t happen. But then when I ask about resetting the system after re inflation, it appears that the system resets itself after driving a certain distance or time. So if the putting an extra couple of pounds in sorts the under inflation warning issue, why doesn’t the system remember the higher pressure and warn when the pressure drops below that higher pressure?

 

[tsedge]

The warning pressures are not configurable, they are fixed. So when the system resets to learn the new pressures it is still comparing them against the fixed expected pressure.

If you set the tyres to a higher pressure it will never get down to the warning trigger.

However, there are downsides to overinflated tyres including wear rate, ride quality and likelihood of bursting. However, a few psi over makes little difference and is quite safe.