The Quick Answer above is the generic definition. What follows is the model-specific detail for the Audi models that log P2004.
DTC/P2004·Audi
P2004 on Audi: Causes, Symptoms and Fix Cost
Quick Answer
Moderate SeveritySafe to drive (short-term)Audi
P2004 on a Audi means the intake manifold runner flaps are stuck in the open position. These flaps change the length of the intake path to optimise airflow at different RPM ranges. When stuck open, the engine loses low-speed torque and may run roughly at idle because airflow is optimised for high RPM only.
Typical repair cost, all makes€110 - €1000
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Audi A4
2005-2024The A4 B7 and B8 with the 2.0 TFSI engine shares the same intake manifold design as the Golf and is equally prone to P2004. On the A4, the manifold is slightly harder to access due to engine bay packaging. The 3.0 TDI V6 also has runner flaps but they fail less frequently.
What causes P2004 on a Audi?
Beyond the generic causes listed on the main P2004 page, these are the patterns noted for Audi models:
Audi A42.0 TFSI intake manifold flap and linkage failure
Audi A43.0 TDI intake flap carbon buildup
How to diagnose P2004 on a Audi with OBD2
Follow these steps to pinpoint the root cause of P2004:
- Listen for a rattling or clicking noise from the intake manifold at idle and during acceleration. Broken flaps or linkage rods often produce a distinct metallic rattle.
- Remove the intake manifold top cover or use a borescope to visually inspect the runner flaps. Check that all flaps move freely and none are cracked, broken, or jammed with carbon deposits.
- Test the runner control actuator motor by commanding it on and off with a diagnostic scanner in actuator test mode. You should hear the motor activate and see the flaps move.
- Check the actuator motor electrically: verify power supply, ground, and motor resistance. A seized motor will draw excessive current or show very low resistance.
- If the flaps and actuator test good, check for vacuum leaks (on vacuum-actuated systems) or wiring faults between the ECU and the actuator motor.
How much does P2004 cost to fix on a Audi? (EUR)
Estimated repair costs for P2004 in EUR, compiled across makes. Expect Audi parts and labour towards the upper end of each range.
Prices estimated as of March 2026. Costs vary by region, vehicle, and shop.
Codes related to P2004
These codes are often seen alongside P2004 or point to related issues, on any make:
Looking for the full P2004 reference (all makes, full diagnosis flow, complete repair cost matrix)?
See the main P2004 guideSkanyx · Audi
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