My Galaxy 2.0L (Oct 2010) has an almost continuous TPMS malfunction warning light on. All tyre pressures are good, they all move as the tyres heat up, they all work as normal and I had a slow puncture in one tyre and it let me know the PSI had dropped to 25psi. The local tyre garage has read all the sensors and they are all transmitting data to the car. Every now and again the warning will go off, and everything is fine for a day or so before it returns. Can anyone help me?

5 minutes ago, Bully The goal machine said:

... Can anyone help me?

TPMS sensors have a built in battery with a usual life duration of 7 to 10 years. Yours are well overdue for replacement. They're not expensive (listings on Ebay). I'd consider thinking about replacement.

10 minutes ago, StephenFord said:

TPMS sensors have a built in battery with a usual life duration of 7 to 10 years. Yours are well overdue for replacement. They're not expensive (listings on Ebay). I'd consider thinking about replacement.

Thanks. So even though they are reading Ok and sending the info to the car's ECU and the tyre company can read and confirm that data is being sent from each wheel sensor, you recommend that I change the sensor batteries / sensors themselves which should solve the issue? 

1 hour ago, Bully The goal machine said:

Thanks. So even though they are reading Ok and sending the info to the car's ECU and the tyre company can read and confirm that data is being sent from each wheel sensor, you recommend that I change the sensor batteries / sensors themselves which should solve the issue? 

I never suggest that any solutions I may advocate will definitely solve an issue, but certainly if it was my car, this would be a point I would start on... The fact that they can transfer data is usually tested when the wheel is static, when spinning at 70Mph, it's a different situation.

10 hours ago, Bully The goal machine said:

So even though they are reading Ok and sending the info to the car's ECU and the tyre company can read and confirm that data is being sent from each wheel sensor,

They can only check the sensor when the car is standing still. They don't measure the strength of the transmitted signal, only that the sensor is transmitting. When the wheel is rotating at speed and driving along our super smooth UK roads it wouldn't take much to disrupt a weak signal.

10 hours ago, unofix said:

They can only check the sensor when the car is standing still. They don't measure the strength of the transmitted signal, only that the sensor is transmitting. When the wheel is rotating at speed and driving along our super smooth UK roads it wouldn't take much to disrupt a weak signal.

I like your thinking...

20 hours ago, StephenFord said:

..The fact that they can transfer data is usually tested when the wheel is static, when spinning at 70Mph, it's a different situation.

👍😁

Genuinely had a moment of confusion there, wondering whether wheels spin at 70mph...

The car moves forward at 70mph.  But are the wheels spinning at that speed?  Obviously not at the hub, but I'm not even sure they are on the outer edge of the treads?  But then I think they must be?  This should be a really simple physics question surely!

Of course, we normally measure 'spin' in rotations instead, because the hub will make the same number of rotations as the treads.  Probably around 600rpm at 70mph.

8 minutes ago, TomsFocus said:

Of course, we normally measure 'spin' in rotations instead, because the hub will make the same number of rotations as the treads.  Probably around 600rpm at 70mph.

Mr Google states at 70mph, "The wheel travels at approximately 880 RPM...."

My brain hurts...🤣

17 minutes ago, StephenFord said:

Mr Google states at 70mph, "The wheel travels at approximately 880 RPM...."

My brain hurts...🤣

It will depend on the engine and gearbox for RPM at 70mph.  But that one is actually quite a simple calculation.

Gearboxes are very roughly at a ratio of 4:1 in top gear.

So 2400rpm at the engine will be around 600rpm at the wheels.

 

But I still can't work out whether the outer edge of the tyre moves at 70mph in order to propel the car at 70mph.