[Biturbos4] B5 S4 codes

[mike]

the low voltage and the brake switch cleared and haven't returned so I'd assumed they were historic from when say the battery was changed or ran flat before I bought it.
mike

      From: Grant Lenahan <glenahan at vfemail.net>
 To: Cody Forbes <cody at 5000tq.com> 
Cc: mike <mikemk40 at yahoo.com>; "biturbos4 at audifans.com" <biturbos4 at audifans.com>; AudiFans (Qlist) S4 Qlist <quattro at audifans.com> 
 Sent: Sunday, 9 November 2014, 20:41
 Subject: Re: B5 S4 codes
   
I was going to say that, except that, in general the “power supply” is the battery, unless these things run off a lower voltage regulated supply from, say, the ECU.

And you did not suggest a weak battery

But i agree with Cody. I just couldn’t explain it further…
Grant

On Nov 9, 2014, at 2:31 PM, Cody Forbes <cody at 5000tq.com> wrote:

> That really looks like a power supply issue. Too many different things. Best thing to do would be break out the multimeter and check power to various things that hate issues. 
> 
> -Cody Forbes (mobile)
> 
> On Nov 9, 2014, at 12:10 PM, mike <mikemk40 at yahoo.com> wrote:
> 
>> Gents, 
>> 
>> codes I have are, 
>> 
>> |  16514  |  P0130  |  O2 Sensor Circ.,Bank1-Sensor1 Malfunction  |
>> |  18010  |  P1602  |  Power Supply (B+) Terminal 30 Low Voltage  |
>> |  16955  |  P0571  |  Cruise/Brake Switch (A) Circ Malfunction  |
>> |  16486  |  P0102  |  Mass or Volume Air Flow Circ Low Input  |
>> |  18030  |  P1622  |  Engine coolant temperature signal range/performance  |
>> |  16490  |  P0106  |  Manifold Abs.Pressure or Bar.Pressure Range/Performance  |
>> |  16538  |  P0154  |  O2 Sensor Circ.,Bank2-Sensor1 No Activity Detected  |
>> |  17528  |  P1120  |  O2 Sensor Heater Circ.,Bank2-Sensor1 Open  |
>> 
>> 
>> second & third went and haven't returned after clearing, the others have come back.
>> 
>> Does anyone know if there are any upstream fuses or other faults that could be giving false positives or am I safe in assuming that the actual sensors mentioned have failed?
>> Cheers
>> 
>>    From: tom winter <tom at tomwintermedia.com>
>> To: quattro at audifans.com 
>> Cc: mikemk40 at yahoo.com 
>> Sent: Wednesday, 5 November 2014, 20:08
>> Subject: B5 S4 codes
>> 
>> For the B5 platform, the forums at Audizine are pretty good. Do some
>> searches and if you can¹t find anything, then maybe post up some
>> questions: http://www.audizine.com/forum/forumdisplay.php/3-B5-S4-RS4
>> 
>> 
>> Tom 2001.5 S4 Avant
>> 
>> 
>>> From: mike [mailto:mikemk40 at yahoo.com]
>>> Sent: November 03, 2014 2:39 PM
>>> To: 'Quattro List'
>>> Subject: B5 S4 codes
>>> 
>>> Long time no post but my old S4 has been retired at 230k miles and
>>> replaced with a "new" one, same age but *only* 100k miles.
>>> new one is doing 22 mpg (old one did 27) so codes were read.
>>> 
>>> Seems there are lambda sensors not working plus maf isn't working but
>>> strangely, looking at blocks I have 50c inlet air temp which on a cold
>>> idling car in the UK is nonsense.
>>> Does anyone know where this temperature reading comes from? Is it MAF?
>>> Cheers
>>> Mike
>>> 
>>> 
>> 
>> 
>> 
>> 
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