Related Products
Alternator - Audi (4N1-903-028)
2019-2026 Audi - 4N1-903-028
- MSRP: $623.08
- Discount: $137.08 (22% off)
- Sale Price: $486.00
Review Fitment & Product Details
Details
- Brand:
- SKU:
4N1-903-028
- Description:
A7 Quattro. 3.0L. S8.
Alternator.You will be required to provide a VIN in order to complete your order.
This item is non-returnable.
- Replaces:
4n0903028n, 4n0903028p, 4n0903028px, 4n1903028x
California Proposition 65
WARNING: Cancer and reproductive harm - www.P65Warnings.ca.gov Pricing is valid online only and may vary in your local store
Vehicle Fitment
Vehicle Fitment
| Year | Make | Model | Body & Trim | Engine & Transmission |
|---|
Key Product Information
Additional Information
| FITMENT | Used across Audi MLB?Evo MHEV platforms with the 48V belt starter?generator: A6/A7 (C8/4K), A8/S8 (D5/4N), Q7/Q8 (4M). Market/engine specifics apply; verify by VIN, engine code, and suffix letter on the part number. Audi A6 (C8/4K) Quattro (2019-2023): 3.0L V6 TFSI MHEV (55 TFSI), 3.0L V6 TDI MHEV (market dependent) Audi A6 allroad (C8/4AH) (2020-2023): 3.0L V6 TFSI MHEV, 3.0L V6 TDI MHEV (market dependent) Audi A7 Sportback (C8/4K) (2019-2023): 3.0L V6 TFSI MHEV Audi A8 (D5/4N) Quattro (2018-2023): 3.0L V6 TFSI MHEV, 4.0L V8 TFSI MHEV Audi S6 (C8/4A) (2020-2023): 2.9L V6 TFSI MHEV Audi S8 (D5/4N) (2020-2023): 4.0L V8 TFSI MHEV Audi Q7 (4M) (2020-2023): 3.0L V6 TFSI MHEV Audi Q8 (4M) (2019-2023): 3.0L V6 TFSI MHEV |
| SYMPTOMS | Common failure indications include yellow 48V/MHEV or battery warning, Start/Stop unavailable, multiple electrical system malfunction messages, reduced charging, or vehicle entering limp/neutral. Frequently logged DTCs associated with the MHEV/ISG system include U046900 (Lost Communication with Starter/Generator Control Module), U002800/U002900 (vehicle network faults), and hybrid/48V battery codes like P0A7D00 (battery state of charge low) and P0B2900 (deep discharge). |
| TROUBLESHOOTING | Verify 48V battery health, DC/DC converter output, ground straps, belt/tensioner condition, and related sensors per Audi TPI guidance—replacing the starter?generator may not fix issues caused by sensor/network faults. If intermittent, check for communication DTCs and wiring harness/connectors at the ISG. A charging system test under load and MHEV scan is recommended before condemning the unit. |
| INSTALLATION | This ISG is liquid?cooled and driven by the FEAD belt. Before service, safely disconnect the 12V and 48V batteries per Audi procedures. Drain/cap coolant lines to the unit; renew coolant and bleed after installation. Remove/inspect the belt and tensioner; replace if worn. After replacement, perform required coding/adaptation/basic settings with ODIS (starter?generator replacement procedure) so the control unit and energy management recognize the new unit. |
| MAINTENANCE | |
| GENERAL NOTES | Audi uses multiple supersessions and suffix letters (E, G, J, N, P, etc.). Always match by VIN and suffix. Some models/markets (e.g., TDI) also use this 48V ISG. Unit is heavy; use proper support during removal/installation. |
| FAULT CODES | |
| REPLACEMENTS | 4N0-903-028-N 4N0-903-028-P 4N1-903-028 4N1903028B 4N1903028BX 4N1903028V 4N1903028X 4N0903028E 4N0903028G 4N0903028J 4N0903028N 4N0903028P 4N0903028PV 4N0903028PX |
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