P2004 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.
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.
Repair cost on Audi€126 - €1150
What does P2004 mean on a Audi?
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 Audi-specific patterns we see most often:
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 on a Audi (Audi parts and labour typically run 15% above the average for this code).
Prices estimated as of May 2026. Costs vary by region, vehicle, and shop.
Related codes that often appear with P2004 on Audi
These codes commonly cluster with P2004 on Audi vehicles:
FAQ: P2004 on Audi
What does P2004 mean on my car?
P2004 means the intake manifold runner flaps are stuck open. These flaps adjust airflow through the intake to optimise torque at different engine speeds. When stuck open, you lose low-end power and fuel efficiency.
Can I drive with P2004?
Yes, short-term driving is safe. The engine will run but with reduced low-speed torque and potentially rough idle. On VW/Audi models, broken flap pieces can potentially be ingested into the engine, so prompt repair is recommended.
Why is P2004 so common on VW and Audi?
The VAG 2.0 TFSI and 2.0 TDI engines use plastic intake manifold flaps connected by thin metal linkage rods. The plastic flaps become brittle over time and the linkage wears, making this one of the most common faults on these engines.
Can I repair the intake flaps or do I need a new manifold?
Aftermarket repair kits with upgraded flaps and linkage are available for 40-150 EUR. These are a reliable and much cheaper fix than replacing the entire manifold (200-600 EUR for the part alone).
Can broken intake flaps damage my engine?
If a plastic flap breaks apart, fragments can be sucked into the combustion chamber and cause scoring on the cylinder walls or valve damage. This is rare but possible, especially on direct-injection engines where the flaps are close to the intake ports.
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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