2021-2024 Audi MIL On Intake Manifold Valve N316 Fault

Symptoms of a Sticking Intake Manifold Valve

Owners of affected 2021-2024 Audi models, including the A3, A4, A5, A6, Q3, Q5, Q7, and S3 equipped with the 2.0 ltr. TFSI engine, may experience the illumination of the Malfunction Indicator Lamp (MIL) on their dashboard. This warning light indicates a problem with the engine's emission control system.

Associated Fault Codes (DTCs)

When the "Audi MIL on intake manifold valve N316" issue occurs, one or more of the following Diagnostic Trouble Codes (DTCs) may be stored in the Engine Control Module (ECM), specifically J623 (address word 0001). These codes sometimes appear in combination with other entries related to the intake manifold:

Code	Description
P200400	Intake Manifold Runner Control Bank 1, Stuck Open
P200600	Intake Manifold Runner Control Bank 1, Stuck Closed
P201400	Intake Manifold Runner Position Sensor Switch circuit
P201500	Intake Manifold Runner Position Sensor/Switch Circuit Air Flow Control Range/Performance

Technical Background

According to Audi Technical Service Bulletin 01 24 31 2072273/2, the root cause of these symptoms and DTCs is often a sticking electric changeover valve (N316). This valve plays a crucial role in the intake manifold runner control system, affecting airflow and engine performance.

Important Warnings and What Not to Replace

Audi explicitly states that it is not necessary to replace the entire intake manifold to resolve this issue. This is an important point for owners to note, as replacing the full intake manifold would be a significantly more expensive and time-consuming repair than addressing the specific valve.

Diagnosis and Repair Procedure

Before replacing the electric changeover valve N316, technicians are instructed to perform several diagnostic checks:

1. Vacuum System Check: Verify that the vacuum pump is operating correctly. This involves checking the vacuum system and its generation, typically using procedures outlined in the Electronic Service Information System (ELSA).
2. Oil Filler Cap Check: Ensure that the oil filler cap is installed correctly, as an improperly seated cap can affect engine vacuum.

If these preliminary checks are satisfactory, the repair involves replacing the electric changeover valve N316. Technicians should refer to the Audi Electronic Parts Catalog (ETKA) for the correct component (component 6 in relevant diagrams).

Required Tools or Parts

The primary part required for this repair is the electric changeover valve N316. Specific part numbers are not listed in the TSB but would be sourced via ETKA. Labor operations associated with this repair include checking the vacuum pump (labor operation 4776 0199) and removing and installing the N316 valve (labor operation 2466 19 XX).

Warranty Information

This Technical Service Bulletin, identified as 01 24 31 2072273/2, is informational only if the vehicle is outside of its warranty period. For vehicles still under warranty, claims must be submitted in accordance with the Audi Warranty Policies and Procedures Manual. All claims are subject to review and audit by Audi Warranty.

Owner Action

If your 2021-2024 Audi is experiencing the MIL illumination with any of the P200400, P200600, P201400, or P201500 DTCs, and you suspect an issue with the "Audi MIL on intake manifold valve N316", it is recommended to schedule an appointment with an authorized Audi service center. Inform them about the symptoms and mention Technical Service Bulletin 01 24 31 2072273/2, which supersedes previous bulletin Group 01 number 23-02 dated December 1, 2023. This will help ensure the correct diagnostic and repair procedures are followed.

Source: NHTSA ID 11005854