Tyre pressure warning.

Sheltie · 01-11-2012, 09:14 AM

Hello guys. Looking for a bit of technical guidance again.

Got the other-half a 330M Sport (272bhp) last month and she (we) love it.

The tyre pressure warning sign is coming on pretty regularly. The tyre pressure hasn't dropped but it comes on when-ever we (she) goes over poor road surfaces - and there are plenty of them around here at present.

My question is: is this common or should I get it seen to?

Thanks again,

Colin.

HighlandPete · 01-11-2012, 02:13 PM

Are you resetting the TPWS, after you check and/or adjust pressures?

Could be as simple as it needs a reset.

HighlandPete

m1bjr · 01-11-2012, 05:22 PM

+1

It works by seeing the diameter of the tyres change slighty, so as one goes flat it turns a bit faster than the one opposite.

The computer registers that over a period of time, in a straight line, one wheel is rotating a bit faster than the other (it uses the ABS wheel sensors to do this)

This is not nromal behaviour, but at Pete says a reset will likely cure it - see the manual.
Ensure all cold tyre pressures are correct, reset it and drive away - as per the handbook.

You can get grief too if you have odd tyres across one axle, or one is very much newer than the opposite tyre.
One heats up a bit faster and 'bong' it registers it as a pressure difference (it really is until the other warms and catches up).
I have had this a couple of times as the lease hire idiots leave me no choice about matching brands.
Eventually I had to drive for an hour to warm then up and THEN reset the bloody thing, or else it would go off every morning after 20min!

01-11-2012, 09:14 AM	#1
Sheltie New Member 0 Rep 14 Posts Drives: 330 m sport Join Date: Jan 2012 Location: NE Scotland iTrader: (0)	Tyre pressure warning. Hello guys. Looking for a bit of technical guidance again. Got the other-half a 330M Sport (272bhp) last month and she (we) love it. The tyre pressure warning sign is coming on pretty regularly. The tyre pressure hasn't dropped but it comes on when-ever we (she) goes over poor road surfaces - and there are plenty of them around here at present. My question is: is this common or should I get it seen to? Thanks again, Colin.
	Appreciate 0 Tweet Quote

01-11-2012, 02:13 PM	#2
HighlandPete Lieutenant General 6659 Rep 15,858 Posts Drives: BMW F11 535i Touring Join Date: Mar 2007 Location: Scotland, Highland Region iTrader: (0)	Are you resetting the TPWS, after you check and/or adjust pressures? Could be as simple as it needs a reset. HighlandPete
	Appreciate 0 Quote

01-11-2012, 05:22 PM	#3
m1bjr LSD - No, you're not seeing things 72 Rep 3,302 Posts Drives: Baby F36 Gran Coupe Join Date: Mar 2010 Location: Plymouth UK iTrader: (4)	+1 It works by seeing the diameter of the tyres change slighty, so as one goes flat it turns a bit faster than the one opposite. The computer registers that over a period of time, in a straight line, one wheel is rotating a bit faster than the other (it uses the ABS wheel sensors to do this) This is not nromal behaviour, but at Pete says a reset will likely cure it - see the manual. Ensure all cold tyre pressures are correct, reset it and drive away - as per the handbook. You can get grief too if you have odd tyres across one axle, or one is very much newer than the opposite tyre. One heats up a bit faster and 'bong' it registers it as a pressure difference (it really is until the other warms and catches up). I have had this a couple of times as the lease hire idiots leave me no choice about matching brands. Eventually I had to drive for an hour to warm then up and THEN reset the bloody thing, or else it would go off every morning after 20min! __________________
	Appreciate 0 Quote