[s-cars] tire pressure sensors

[David Giannandrea]

And that indicates the so-far unfound reset button. I'm waiting on the owner
to provide the manual.

Thanks all.

-----Original Message-----
From: Michael Wakefield [mailto:S4Quattro at comcast.net] 
Sent: Monday, July 23, 2012 2:25 PM
To: Theodore Chen
Cc: weski at verizon.net; David Giannandrea; s-car-list at audifans.com
Subject: Re: [s-cars] tire pressure sensors

Also, TPMS systems are absolute pressure gauges, and assume the atmospheric
pressure is 14.7psi on the outside of the tire. If you live in Colorado,
like I do, they are always off by about 2.7 psi, the difference between sea
level 14.7 and our approx. 12.0psi.
Mike Wakefield
Highlands Ranch CO
On {July23}, at 12:49 PM, Theodore Chen wrote:

> 2008?  Isn't that a B7?  According to this link:
> 
> http://uberlame.com/a6_tsb/TPMS/TPMS%20Overview.pdf
> 
> It says the spare tire has a sensor but it's not learned or monitored.
> 
> It also says the B7 A4 has the low
> line TPMS, which is what my Q7 has.  This system has just one antenna, 
> so it doesn't know where the sensors are.  I didn't know you could 
> read out the values for each sensor.
> 
> My Q7 has a TPMS fault code 01521, code 002 Lower Limit Exceeded.  I don't
know which sensor it is, though, and it doesn't appear to give me a list of
values.
> 
> 
> 
> ________________________________
> From: "weski at verizon.net" <weski at verizon.net>
> To: David Giannandrea <david.giannandrea at sbcglobal.net>
> Cc: s-car-list at audifans.com
> Sent: Monday, July 23, 2012 3:32 AM
> Subject: Re: [s-cars] tire pressure sensors
> 
> 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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