B5 S4 codes

[patrick gillen]

Would it be on left side in front of the radiator and maybe reading high from radiator radiation heat transfer while stationary and not enough from airflow convective heat transfer while moving? 

-----Original Message-----
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