Audi A4 and missing GP fault code


Veteran Member
Jan 15, 2005
Audi A4 1.9TDi Avant Quattro 2001 silver
We have a 2001 audi A4 1.9TDi avant quattro (8D) which was really hard to start when it was -18°C last night. I checked the Glow Plugs with a multimeter and one of them showed 0.609 M ohm, one 24 ohms and the two others was normal (almost shorted). So I changed them, but is it normal that one (or more) bad GP's dont throw any fault code ? I scanned the car with VAG-COM (serial version and 409.1) and no fault code was present. If it should have thrown a fault code, what can be wrong since it didn't ? (where to look and what to look for)

Also, is there anyone who knows the "codes" in group 12 (engine module) under "glow status", I know that all 1's = off, but does anyone knows about the other codes ?