Sky InsuranceChris Nott
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  1. #1
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    Tyre Pressure Monitor Accuracy

    I have the tyre pressure monitor on the car. A few weeks ago I blew the tyres up to the higher of the two pressures on the door sticker (42psi in my case), and reset the monitor on the MMI. I've not used the car a huge amount since then for various reasons, nor have I checked the pressures. Finally did them today and was surprised to discover they had all dropped to between 34 and 38psi, with no warning from the monitor. In both cases the pressures were checked with my own compressor which I believe is accurate.

    Now, I admit I am at fault for not checking the tyres more frequently, but that said I would have expected the monitor to have picked up a drop in pressure of this magnitude. Does anyone know any more about the technical aspects of these systems; how accurate are they? I get the impression their only use is to give you a bit more warning of a tyre that's about to blow out; still useful, but not quite what I was hoping for.
    A3 8V 1.8T 6 speed 3 door S line - Daytona Grey. Interior lighting pack, privacy glass, comfort pack, electric folding heated dimming door mirrors, tyre pressure monitor, electric lumbar support, cruise control, acoustic parking system rear, B&O sound system.

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  3. #2
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    I think it measures differential in circumference. If they all fall the same amount, it won't be detected. Only when one is out from the others - at least that is how I understand it....

  4. #3
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    Hi, as far as I understand it uses the ABS and detects the difference in rotational speed of each wheel.
    Now a proud owner of a A3 1.4 tfsi Saloon S-Line, 6-speed, Daytona Grey, Technology Pack, Comfort Pack, Cruise, Advanced Key, Privacy Glass, Audi Parking System Plus, Interior Lighting, Folding Door Mirrors, Light & Rain Sensor. Hold Assist.

  5. #4
    6th Gear

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    Worked fine for me and alerted me when mine had dropped by a few PSI
    Sport 2.0 TDI 150 Sportback in Scuba Blue, alcantara/leather, advanced key, audi sound system, comfort pack w/ ACC and park assist, deselect sports suspension, auto-dimming & folding door mirrors, electric lumbar support, heated seats, hold assist, non-smoking pack, side & lane assist, reversing camera, storage & luggage pack, tech pack with audi connect, tyre pressure warning, towbar, variable headlight range control, xenon light pack

  6. #5
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    Have found it pretty good on 4 Audis we've owned (not an 8V yet). BUT Very annoying when it alerts you that there is an issue at 0500hrs when it is wet and cold and the only problem is a 2psi difference on one wheel.

  7. #6
    dieseldoug's Avatar
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    I trust you had run the car before checking the tyre pressures, if so I would suggest you purchase a digital pressure gauge as this will be your constant monitor.


    A3, 2.0 TDI, S-Line, 6 speed manual, Scuba Blue, S-Line suspension, heated/folding mirrors, privacy glass, fine nappa leather, heated seats, light/rain sensor pack, flat tyre indicator, Purchased and supplied by Aberdeen Audi

 

 

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