2021 Audi A4/A5 MIL On with P227900, P001600, P001700 DTCs

Symptoms

Owners of affected 2021 Audi A4 and A5 vehicles equipped with the 2.0 TFSI engine may observe the Malfunction Indicator Lamp (MIL) illuminating on the dashboard. This "MIL on" condition is the primary symptom reported by customers.

Fault Codes (DTCs)

The Engine Control Module (ECM), J623 (address word 0001), will store specific Diagnostic Trouble Codes (DTCs) indicating the nature of the fault. This TSB 01 21 04 2062862/1 specifically addresses the following codes:

Code	Description	Symptom Code
P227900	Leakage air in intake system	43055
P001600	bank 1, camshaft pos./crankshaft position sensor incorrect assignment	43056, 43058
P001700	bank 1, camshaft pos./crankshaft position sensor 2 incorrect assignment	43057, 43059

Diagnosis and Trigger Conditions

The presence of these specific DTCs, particularly when P227900 is recorded first, followed shortly by P001600 and/or P001700, points to the condition addressed by this bulletin. Workshop findings confirm that the "MIL on" customer concern can be reproduced under these conditions.

Important Warnings

• DTC Combination Specificity: This Technical Service Bulletin (TSB) 01 21 04 2062862/1 only applies to the exact combination of possible DTCs listed above. No other relevant DTCs must be present; if additional codes are found, they must be diagnosed separately.
• Post-Repair Reset: After replacing the intake manifold pressure sender, it is critically important to reset the air pressure-based camshaft angle adaptation/correction. Failure to perform this step will not resolve the underlying problem. This reset is performed in self-diagnosis mode under "basic setting >> air pressure-based camshaft angle adaptation/camshaft angle correction."

Repair Procedure Summary

The repair for the "Audi A5 MIL on" issue involves replacing the intake manifold pressure sender. This procedure should be performed according to the detailed instructions found in the ELSA repair manual. Following the physical replacement, a crucial software adaptation step is required. Technicians must reset the air pressure-based camshaft angle adaptation/correction using a diagnostic tool.

Required Parts and Tools

To perform this repair, the following parts and specialized tools are necessary:

• Part Number: 06L906051K
  • Part Description: Pressure Sensor (Quantity: 1)
• Fasteners: Fasteners, Bolts, Nuts, and Screws as needed per the Repair Manual (Quantity: See ETKA/ELSA)
• Tool Number: VAS 6160/VAS 6150
  • Tool Description: VAS tester with the current version of ODIS (Windows 10)

Warranty Information

This repair, identified by Service Number 2471 and Damage Code 0040, is generally covered under Audi's warranty.

• Claim Type 110: Applicable for new vehicles up to 48 months or 50,000 miles, whichever occurs first.
• Claim Type G10: Applicable for Audi Certified Pre-Owned (CPO) vehicles, requiring owner verification.
• Out-of-Warranty: If your vehicle is outside of warranty coverage, this Technical Service Bulletin serves as informational guidance.

Labor operations include removing and installing the intake manifold pressure sender (2471 1915), diagnostic time for checking and clearing faults (0150 0000, max 30 TU), and road tests before (0121 0002, 10 TU) and after (0121 0004, 10 TU) the service procedure. All warranty claims must adhere to the Audi Warranty Policies and Procedures Manual.

Owner Action

If your 2021 Audi A4 or A5 is displaying a "MIL on" warning light and you suspect it might be related to the DTCs P227900, P001600, or P001700, it is recommended to contact an authorized Audi dealership. Provide them with the symptoms you are experiencing and mention Technical Service Bulletin 01 21 04 2062862/1. The dealership will perform a diagnosis to confirm the presence of the specific fault codes and carry out the necessary repair, which involves replacing the intake manifold pressure sender and performing the required software adaptation.

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Source: NHTSA ID: 10196892, TSB ID: 01 21 04 2062862/1