2003 Audi A4 bearing, hub & seal reference
Look up 28 BCA catalogue entries for 2003 Audi A4. Compare full part references, component roles and recorded restrictions; confirm current vehicle-specific requirements before use.
Filter by vehicle and component
What this lookup establishes—and what it does not
Source: BCA 2021 Wheel Hub Assembly, Bearing and Seal Catalog. The loaded entries cover listed model years from 1995 through 2020. This is a historical catalogue reference, not a live VIN decoder or a guarantee for every trim, market or production date.
BCA is an NTN-owned product line. The numbers below remain BCA part references; they are not silently converted into NTN, SKF or another brand's part numbers. Confirm current OEM/service requirements before use.
Which bearing or hub reference applies?
The catalogue contains 28 reference entries for 2003 Audi A4. Select the year and component, then read the full condition and footnote fields. There is no single universal bearing number for every support in this vehicle.
Reference records
1–25 of 28“Bearing”, “hub assembly”, “seal” and “repair sleeve” describe different components. The source description, rather than the catalogue title, determines the role of each number.
On a phone, each record is shown as a complete card with its restrictions. These records do not supply tightening torques or certify a replacement.
| BCA part reference | Component / position | Source model years | Recorded conditions & restrictions | Source trace |
|---|---|---|---|---|
| NB107BCA catalogue reference | Automatic Transmission | 2002–2005Subject to the conditions in this row | Output Shaft Bearing - Left - Automatic Trans.; 5 Speed Trans
| 2021 catalogue Page 19Entry 632ebaca |
| NB32010XBCA catalogue reference | Automatic Transmission | 2002–2005Subject to the conditions in this row | Output Shaft Bearing - Automatic Trans.; 5 Speed Trans
| 2021 catalogue Page 19Entry 9fc04384 |
| NB32010XBCA catalogue reference | Automatic Transmission | 2002–2005Subject to the conditions in this row | Pinion Bearing - Rear - 01V Trans.; Automatic Trans.; 5 Speed Trans
| 2021 catalogue Page 19Entry 09edf097 |
| NBA5BCA catalogue reference | Automatic Transmission | 1996–2003Subject to the conditions in this row | Idler Gear Bearing - 01V Trans.; Automatic Trans.; 5 Speed Trans
| 2021 catalogue Page 17Entry 0371da8a |
| NBLM300811BCA catalogue reference | Automatic Transmission | 2002–2005Subject to the conditions in this row | Race - Right - Automatic Trans.; 5 Speed Trans
| 2021 catalogue Page 19Entry 75e1eef9 |
| NBLM300849BCA catalogue reference | Automatic Transmission | 1996–2005Subject to the conditions in this row | Bearing - Right - 01V Trans.; Automatic Trans.; 5 Speed TransNo additional numbered footnote is attached to this source row. | 2021 catalogue Page 18Entry b03a9e1b |
| NBLM503310BCA catalogue reference | Automatic Transmission | 2002–2005Subject to the conditions in this row | Pinion Race - Front - Automatic Trans.; 5 Speed Trans
| 2021 catalogue Page 19Entry f77d80a6 |
| NBLM503349ABCA catalogue reference | Automatic Transmission | 2002–2005Subject to the conditions in this row | Pinion Bearing - Front - Automatic Trans.; 5 Speed Trans
| 2021 catalogue Page 19Entry a1c2acf6 |
| NBLM806610BCA catalogue reference | Automatic Transmission | 1996–2005Subject to the conditions in this row | Race - Left - 01V Trans.; Automatic Trans.; 5 Speed TransNo additional numbered footnote is attached to this source row. | 2021 catalogue Page 18Entry 414b2a9c |
| NBLM806610BCA catalogue reference | Automatic Transmission | 2002–2005Subject to the conditions in this row | Race - Left - Automatic Trans.; 5 Speed Trans
| 2021 catalogue Page 19Entry 9432fcf6 |
| NBLM806649BCA catalogue reference | Automatic Transmission | 1996–2005Subject to the conditions in this row | Bearing - Left - 01V Trans.; Automatic Trans.; 5 Speed TransNo additional numbered footnote is attached to this source row. | 2021 catalogue Page 18Entry 99a3b6d0 |
| NBLM806649BCA catalogue reference | Automatic Transmission | 2002–2005Subject to the conditions in this row | Bearing - Left - Automatic Trans.; 5 Speed Trans
| 2021 catalogue Page 19Entry da9c225c |
| NS221207BCA catalogue reference | Automatic Transmission | 1996–2005Subject to the conditions in this row | Manual Shaft Seal - 01V Trans.; Automatic Trans.; 5 Speed TransNo additional numbered footnote is attached to this source row. | 2021 catalogue Page 18Entry 90effdd4 |
| NS223510BCA catalogue reference | Automatic Transmission | 1996–2006Subject to the conditions in this row | Output Shaft Seal - 01V Trans.; Automatic Trans.; 5 Speed TransNo additional numbered footnote is attached to this source row. | 2021 catalogue Page 19Entry 9d8b6d33 |
| NBF85265BCA catalogue reference | Clutch | 1997–2005Subject to the conditions in this row | Pilot Bearing - 1.8L 1781cc L4No additional numbered footnote is attached to this source row. | 2021 catalogue Page 20Entry 4e7916a6 |
| NS224200BCA catalogue reference | Engine | 2002–2005Subject to the conditions in this row | Camshaft Seal - 3.0L 2976cc V6No additional numbered footnote is attached to this source row. | 2021 catalogue Page 22Entry 3ee53509 |
| NS3476BCA catalogue reference | Engine | 2000–2006Subject to the conditions in this row | Camshaft Seal - 1.8L 1781cc L4No additional numbered footnote is attached to this source row. | 2021 catalogue Page 22Entry a5979906 |
| NS710618BCA catalogue reference | Engine | 1997–2006Subject to the conditions in this row | Crankshaft Seal - Front - 1.8L 1781cc L4No additional numbered footnote is attached to this source row. | 2021 catalogue Page 22Entry 42846fce |
| NS710618BCA catalogue reference | Engine | 2002–2005Subject to the conditions in this row | Crankshaft Seal - Front - 3.0L 2976cc V6No additional numbered footnote is attached to this source row. | 2021 catalogue Page 22Entry bbe37d73 |
| NS99166BCA catalogue reference | Engine | 2002–2003Subject to the conditions in this row | Camshaft Repair Sleeve - 3.0L 2976cc V6No additional numbered footnote is attached to this source row. | 2021 catalogue Page 22Entry fd94c887 |
| NBA35BCA catalogue reference | Manual Transmission | 1996–2004Subject to the conditions in this row | Differential Bearing - Left - 012 Trans.; Manual Trans.; 5 Speed TransNo additional numbered footnote is attached to this source row. | 2021 catalogue Page 24Entry 0d615503 |
| NBLM300811BCA catalogue reference | Manual Transmission | 1996–2004Subject to the conditions in this row | Differential Race - Right - 012 Trans.; Manual Trans.; 5 Speed TransNo additional numbered footnote is attached to this source row. | 2021 catalogue Page 24Entry 57b5cd48 |
| NBLM300849BCA catalogue reference | Manual Transmission | 1996–2004Subject to the conditions in this row | Differential Bearing - Right - 012 Trans.; Manual Trans.; 5 Speed TransNo additional numbered footnote is attached to this source row. | 2021 catalogue Page 24Entry 5ee206dd |
| NBLM300849BCA catalogue reference | Manual Transmission | 1996–2005Subject to the conditions in this row | Differential Bearing - Right - Manual Trans.; 5 Speed Trans
| 2021 catalogue Page 25Entry 8466b15e |
| NS222540BCA catalogue reference | Manual Transmission | 1996–2004Subject to the conditions in this row | Input Shaft Seal - 012 Trans.; Manual Trans.; 5 Speed TransNo additional numbered footnote is attached to this source row. | 2021 catalogue Page 24Entry 6dc74f5e |
Checks before treating a reference as a replacement
Identify the complete vehicle
Match model year, engine, transmission, driven axle, body and production/VIN limits. A year and model name alone may leave several valid-looking entries.
Match the component role
Distinguish a loose bearing, complete hub, cup/cone, seal and repair sleeve. Check front/rear and inner/outer or left/right position exactly as recorded.
Preserve vehicle-specific interfaces
Confirm encoder/ABS arrangement, flange and spline interfaces, retention and the current service procedure. Do not transfer torque or installation force from an unrelated part.
How to use these results
Does a listed number guarantee fitment for my VIN?
No. These are source-listed catalogue references. Read every restriction and verify the current OEM and manufacturer information for the exact vehicle configuration. Missing VIN or production details remain unknown.
Can I replace a hub using a bearing with the same dimensions?
Not on dimensions alone. The complete assembly, encoder, retention, loading and installation interfaces must agree. The main bearing catalogue and cross-brand comparisons are separate dimensional references, not vehicle approvals.
Where are the axle-nut torque and installation instructions?
This application catalogue does not establish a universal torque or a complete installation sequence. Use the current vehicle-specific service procedure, including fastener reuse rules and staged tightening. Do not infer torque from the bearing number.
Does wheel noise prove that one of these parts has failed?
No. Bearing damage, tyres, brakes and driveline faults can produce overlapping symptoms. A reference lookup identifies candidates; it does not diagnose the cause or prove which side has failed.
Look up an exact source part number
Keep the BCA prefix and full marking. Similar numbers from other manufacturers are not automatically cross-references.
Continue the technical investigation
Source and interpretation limits
Factual reference basis: BCA 2021 Wheel Hub Assembly, Bearing and Seal Catalog, published by BCA Bearings, an NTN product line, with its linked numbered footnote reference. Each row retains its source page and restrictions. Vehicle names shared by one source entry remain associated with that entry; source counts are not quantities for sale.
BearingScope provides independently organized technical lookup and interpretation. It does not sell these parts, provide a repair service, certify current fitment, or claim that an absent result is unavailable from a manufacturer. Original public catalogue files and source fingerprints are retained in the site's verification records.