[s-cars] tire pressure sensors

[Theodore Chen]

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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