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Johnjonjo

Tyre pressure warning

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Hi all

 

This morning on the way to work (20 minute city drive) the tyre warning light came on.

My car is 2011 so has basic system. 

Not yet had chance to check pressures but quick inspection showed no nails and tyres look properly inflated. 

I reset the system in the morning and all fine on journey home.

My car has runflat tyres.

I'm thinking false alarm, anyone had any similar experiences?

Will get tyre pressures checked tomorrow at local Kwik fit.

 

Thank you

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I can trust them for just tyre pressures lol

I remember the system went off a few months ago and was nothing.

A few years ago on my E60 I had nail in runflat and the system didn't tell me, found out from a shopper at Sainsbury's as I was driving out the car park lol

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Mine has falsely alerted me once before but I put it down to me forgetting to reset the tyre pressure monitor after inflating the tyres. The false warning never came back after doing the reset (2010 model)

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Thank you so much for your experiences guys.

Just been to Kwik fit and all tyres were slightly down but drivers side front tyre was down alot.

The thing is with runflat tyres it's so hard to tell as the sidewalls are so strong and so make the tyre look correctly inflated. 

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1 hour ago, Johnjonjo said:

The thing is with runflat tyres it's so hard to tell as the sidewalls are so strong and so make the tyre look correctly inflated. 

 

Which is why you have tpws. You can't tell by looking at them.

 

The system is pretty reliable and in your case it was genuine as it has been in all the times it alarmed in my E60 but that's because I as a vey tiny leak from the tyre to rim interface.

 

I've never had a false alarm. Tyres will loose air naturally which will trigger the alarm but it doesn't mean you have a nail in the tyre.

 

But please don't take your car to Kwik Fit.

 

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1 hour ago, 535i Andrew said:

 

Which is why you have tpws. You can't tell by looking at them.

 

The system is pretty reliable and in your case it was genuine as it has been in all the times it alarmed in my E60 but that's because I as a vey tiny leak from the tyre to rim interface.

 

I've never had a false alarm. Tyres will loose air naturally which will trigger the alarm but it doesn't mean you have a nail in the tyre.

 

But please don't take your car to Kwik Fit.

 

 

Amen!

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The cheap system relies on relative wheel rotation speeds not tyre pressure

  1. You are not checking your tyres pressure regularly enough like as in bi-weekly
  2. One of the ABS sensors could be on the way out

 

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6 hours ago, sshooie said:

Bi weekly? Me neither, once a month if I remember and before any long journeys. 

Same here re frequency but I don’t trust a petrol station’s equipment nor a vendor like Kwik fit to check my tyre pressures. I bought myself one of these and couldn’t be happier: https://www.pcl-online.com/dtpg8-digital-tyre-pressure-gauge-1358-p.asp

 

My wife’s F45 has full TPMS and is far more sensitive to pressure fluctuations so this pressure gauge is very handy. 

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+1 on PCL pressure gauges. I have one but it's a much simpler pencil gauge. Ashamed to admit but I checked mine for the first time in about two months, no loss of pressure thank goodness. Ideally I check mine about twice a month. You want to look after your tyres and keep an eye on them as they are the only thing that keeps you on the black stuff, between the hedges and out of the ditches.

 

Never trust a forecourts gauge. They get knocked about and will loose their calibration. Plus if it's hooked up to a workshop air line you never know if the oil and water interceptor in the air line upstream of tyre inflator has been cleaned out so you are only getting air in your tyre and not air, oil and water.

 

TPMS is the more expensive tyre pressure monitoring system, this works by sensors inside the tyre attached to the valve and in some systems can give a near constant pressure reading of each tyre and can tell you how flat and what tyre has the problem. My wife's Kuga has this and whilst parked up, we learned of a puncture when the system fired off a warning.  

 

TPWS is the cheaper tyre pressure warning system, this works by simply comparing each wheel rotational speed using the abs wheel sensors.  A flat tyre revolves faster as its rolling radii is less so is detected that way. When the system detects an issue it won't tell you which wheel has a fault and you need to check each one in turn. It will only detect a loss of pressure when you are moving. You then don't have sensors inside the tyre fixed to the rim that can't get damaged by a careless tyre fitter.

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1 hour ago, sshooie said:

 I'm happy with the cheapo one for me.

 

Likewise, it worked fine for me on the E60 and it's been fine on the F10.

 

Cheapo system can be advantageous if you run a set of winters, without the need for four extra pressure sensors. If I buy a set of winters for the wife's Kuga, I need four sensors at £30 each, plus coding them to the car, but I'm not then sure if that wipes out the sensors from the summers. I believe the BMW ones don't need coded to the car.

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That PCL gauge seems a bit steep. Is it really that better than the generic Draper/Sealey ones? I still need to replace my gauge I left in my old F10 when I traded it in. Still kicking myself about that.

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3 hours ago, Scimmer said:

That PCL gauge seems a bit steep. Is it really that better than the generic Draper/Sealey ones? I still need to replace my gauge I left in my old F10 when I traded it in. Still kicking myself about that.

I bought mine for around £30 and it is self calibrating so I have much more confidence than with my much cheaper sealey one and it is much easier to use with the long wand and rubber hose. 

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11 hours ago, Scimmer said:

That PCL gauge seems a bit steep. Is it really that better than the generic Draper/Sealey ones? I still need to replace my gauge I left in my old F10 when I traded it in. Still kicking myself about that.

 

A quick search of the PCL part number yields two on eBay for less than £30.

 

http://www.ebay.co.uk/itm/PCL-Digital-Self-Calibrating-Tyre-Pressure-Gauge-DTPG8-/131853238812?epid=678980411&hash=item1eb310c21c:g:0IsAAOSwU8hY8hJA

 

Draper rrp are always very high but generally can be bought for much less on line.

 

PCL specialise in air line Components rather than Draper who source a wide range of tools from a wide range of suppliers. I'm a big fan of Draper tools, the finish on them is far better than the Sealey tools I have, but for something like this, go to the people who know.

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Can we retrofit the better version of the tpms to the cheapo version?

Bought wonder tyre wheel package used and I'm pretty sure they are fitted with the better version.

How do I get them to work on my car idrive? Do i need to add bits to make them work? 

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Imho most digital gauges or terribly inaccurate and can be very temperature sensitive especially the cheap ones

 

I have on of these and it always scores highly during tests:

 

https://www.amazon.co.uk/RACE-RX0014-Tyre-Pressure-Gauge/dp/B000VZ8S26/ref=as_li_ss_tl?s=automotive&ie=UTF8&qid=1487627457&sr=1-5&keywords=tyre+pressure+gauge&linkCode=sl1&tag=bestreviewer1-21&linkId=74e5214f1b1bd04ee840cbf505796c0a

 

I always did  my non TPMS tyres Bi weekly and I still do weekly for my motorbikes where it is probably a lot more important. 

 

The Proper TPMS sensors are pretty accurate as well 

I have TPMS on my F11 and my Kia Soul but Kia decided just to provide a yellow light on the dash rather than present the pressure and temp data on the centre screen! 

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