Possible causes

– Engine Control Module (ECM) Program
– Intake manifold runner control mechanical problems
– Intake manifold runner control actuator malfunction
– Intake manifold runner control open or short circuit
– Intake manifold runner control poor electrical condition

Tech notes

There is a factory service bulletin for the P2004 code for the following models:

2005-2007 Audi A3
2005-2007 Audi A4
2007 Audi A4 Cabriolet
2008 Audi TT
Audi Factory Service Bulletin OBDII Code P2004

Symptoms

– Engine Light ON (or Service Engine Soon Warning Light)

P2004 AUDI Description

The Engine Control Module (ECM) detects that the position feedback of the manifold flow valve position sensor is not within range of adapted value learned during inplant initialization or after volatile memory reset

AUDI Technical Service Bulletins for P2004 code