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The short version
- The Audi S4 wheel bearing is never cataloged under its own name. Every generation routes through the same-year A4 chart by B-code.
- B5, B6, B7 and B8 S4s all use the same numbers as their A4 siblings. The early 1992-1994 UrS4 rode on the C4 100-series platform instead and goes by old part or VIN.
- The one S-specific row is the 2007 to 2008 RS4 rear, 512305. It matches the A4-family number from that same era.
- Matching by model year alone risks the wrong generation window, always confirm the B-code first.
Audi never gave the S4 its own line in the parts catalogs. Every generation borrows straight from the A4 built the same year. The fastest way to find a number is to know the chassis code before opening a search box.
Routed through the A4, generation by generation
Every generation, B5 through B8, matches the same-year A4 chart rather than carrying a separate S4 row.
The 2007 to 2008 RS4 rear carries 512305. That number lines up with the A4-family number from that same era.
Audi S4 wheel bearing part numbers
| Years | Detail | Number |
|---|---|---|
| 2010 to 2016 (B8) | Front and rear | route through the A4 chart by B-code |
| 2004 to 2008 (B6/B7) | Front and rear | route through the A4 chart by B-code |
| 1997 to 2002 (B5) | Front and rear | route through the A4 chart by B-code |
| 1992 to 1994 (UrS4, C4 platform) | Front and rear, 100-series platform, not A4-based | match old part or VIN |
| 2007 to 2008 (RS4) | Rear | 512305 check price |
Every model year this chart resolves: 2007 and 2008. On this chart a 1992, 1993, 1994, 1997, 1998, 1999, 2000, 2001, 2002, 2004, 2005, 2006, 2010, 2011, 2012, 2013, 2014, 2015 and 2016 Audi S4 is not documented, so those cars go by the old part or the VIN.
Price links lead to Amazon searches for that number. As an Amazon Associate this site earns from qualifying purchases.
Lookups run through the cross reference page.
Audi’s generation years overlap and shift by market. A plain model year can point to the wrong chart entry.
Confirm the B-code on the build plate before pulling a number from the A4 page.
One badge, one platform, one catalog line
Audi built the S4 as a higher output version of the A4, not a separate parts platform. The chassis, hub carriers and bearing seats came off the same line. That is likely why the catalogs never gave the S4 its own row.
The same logic carries through to the RS4, the S4’s hotter sibling. It extends right up to that one 512305 rear number. For the full generation by generation numbers, the A4 chart is the actual reference.
Where the S4 sits in the Audi lineup
Readers cross-shopping other Audi models from the same years have options. The A5 page and the A6 page each carry their own generation-specific chart. Neither substitutes for the A4-linked numbers an S4 actually needs.
Diagnosing an Audi S4 wheel bearing
- Confirm the B-code on the build plate before ordering anything.
- Match the same-year A4 chart rather than assuming the S4 carries its own row.
- Check for the RS4 rear number only on a 2007 to 2008 RS4, not a standard S4.
- Rock each wheel to feel for vertical play at the hub.
- Cross check the retail listing against the VIN before paying.
The full process is on the wheel bearing check page. How the rear differs from the front is explained on the axle versus wheel bearing page.
Common questions
Which Audi S4 wheel bearing number applies?
None of them are S4-specific except the 2007 to 2008 RS4 rear, 512305. Every other year matches the same-year A4 chart by B-code.
Does the S4 use a different bearing than the A4?
No. The catalogs never split the S4 out from the A4 of the same generation. The same numbers apply once the B-code is confirmed.
What fits the RS4 rear?
512305, documented for the 2007 to 2008 RS4, and it matches the A4-family number from that same era.
How do I find the right B-code?
Check the build plate or the door jamb sticker. Matching by calendar year alone can point to the wrong generation, since Audi’s model years overlap across markets.
Is there a separate front and rear split on the S4?
The catalogs do not document one separately. Both ends route through the same A4 chart entry for the matching B-code.