[s-cars] tire pressure sensors

[weski at verizon.net]

Did you check the pressure in the spare tire? If it is low, this will 
also set off your warning light.

Paul

On 7/23/2012 2:11 AM, David Giannandrea wrote:
> I just ordered the Bentley for the 2008 A4 which should answer some of the
> following questions about tire pressure sensors. But this group has so much
> more knowledge I need to ask anyway.
>
> I looked into the measurement values and found pressures reported that were
> way off from readings taken at the tires. With about 37psi in each tire I
> got readings between 1.87 to 2.55 bar. This calculated to 36,29,30,27psi for
> the 4 tires, and of course, the tire pressure warning light is on.
>
> Are there batteries in the pressure sensors??
>
> I guess I just replace the ones that are wildly inaccurate. That would be 3
> of the 5.
>
> I thought these things were a bit more reliable than that. What's the
> wisdom?
>
> David G.
>
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