2002-2011 Audi Coolant Reservoir / Tank / Bottle Cap 8E0121321

OEM Part #: 8E0-121-321 (8E0121321)

$6.68
Used
Donor2005 Audi A8 · 4.2L
SKU: 616917 · 30-Day Returns
✓ Free Same Day Shipping on orders by noon CT
Only 1 in stock — no guaranteed restock
Coolant Reservoir / Tank / Bottle Cap 8E0121321 — Used (SKU 616917)
Genuine OEM Used SKU: 616917 Donor Vehicle: 2005 Audi A8 · 4.2L 2 photos
$6.68
30-Day Returns
  • Genuine OEM — real photos
  • 30-day returns on eligible parts
  • eBay Top Rated · 100,000+ positive ratings
  • Ships from our own indoor warehouse

A used OEM Audi coolant reservoir cap, part number 8E0121321, also known as a Coolant Tank or Bottle Cap. This genuine cap seals the expansion tank, preventing coolant loss and maintaining system pressure. It is a direct replacement for a range of Audi models including the A4, A6, S4, and S8, covering multiple engine displacements from 1.8L to 5.2L. A common failure symptom is a loose or leaking seal, which can lead to low coolant levels and potential overheating.

Specifications

Specifications for Coolant Reservoir / Tank / Bottle Cap 8E0121321
Fits Vehicle ModelA4, A6, A8, S4, S6, S8
Fits Vehicle MakeAudi
OEM Part No8E0-121-321 (8E0121321)
CategoryRadiator / Coolant

Compatible Vehicles

Fits 105 vehicle configurations across 1 make, 2002-2011.

Check your specific vehicle before ordering. This list shows year, make, and model. Some years have multiple trims or engines that use different parts, and individual listings may have additional fitment notes (e.g. “with sunroof only”). Review the full variant list below, or message us with your VIN and we’ll confirm the match.

Audi

  • A4 2002-2006 · 34 variants 10 with notes
  • A6 2002-2011 · 38 variants
  • A8 2004-2010 · 18 variants 7 with notes
  • S4 2004-2006 · 7 variants
  • S6 2007-2011 · 5 variants
  • S8 2007-2009 · 3 variants
View all 105 vehicle configurations — 17 with fitment notes
Full vehicle fitment list for Coolant Reservoir / Tank / Bottle Cap 8E0121321
Year Make Model Trim Engine Note
2011 Audi A6 Sedan 3.2L V6
2010 Audi A6 Sedan 3.2L V6
2005 Audi A4 Quattro Sedan 1.8L l4 Turbo
2006 Audi A4 Convertible 1.8L l4 Turbo For Vehicles with Engine Code(s) AMB
2009 Audi A6 Sedan 3.2L V6
2004 Audi A4 Sedan 3.0L V6
2003 Audi A4 Sedan 3.0L V6
2005 Audi A4 Quattro Wagon 1.8L l4 Turbo
2003 Audi A4 Convertible 1.8L l4 Turbo For Vehicles with Engine Code(s) AMB
2005 Audi A4 Sedan 1.8L l4 Turbo
2004 Audi A4 Convertible 1.8L l4 Turbo For Vehicles with Engine Code(s) AMB
2005 Audi A4 Convertible 1.8L l4 Turbo For Vehicles with Engine Code(s) AMB
2003 Audi A4 Convertible 3.0L V6 For Vehicles with Engine Code(s) AVK, BGN
2008 Audi A8 Quattro Sedan 4.2L V8
2008 Audi A8 Quattro L Sedan 4.2L V8
2009 Audi S6 Sedan 5.2L V10
2008 Audi A6 Quattro Wagon 3.2L V6
2008 Audi A6 Quattro Sedan 3.2L V6
2008 Audi S8 Sedan 5.2L V10
2006 Audi A8 Quattro Sedan 4.2L V8 For Vehicles with Engine Code(s) BFM, BGK
2006 Audi A8 Quattro L Sedan 4.2L V8 For Vehicles with Engine Code(s) BFM, BGK
2006 Audi A6 Sedan 3.2L V6
2007 Audi A6 Quattro Sedan 4.2L V8
2007 Audi A8 Quattro Sedan 4.2L V8 For Vehicles with Engine Code(s) BFM, BGK
2009 Audi S8 Sedan 5.2L V10
2005 Audi S4 Wagon 4.2L V8
2004 Audi S4 Sedan 4.2L V8
2005 Audi A8 Quattro L Sedan 4.2L V8 For Vehicles with Engine Code(s) BFM, BGK
2009 Audi A8 Quattro Sedan 4.2L V8
2006 Audi A6 Quattro Sedan 3.2L V6
2009 Audi A8 Quattro L Sedan 6.0L W12
2008 Audi A6 Sedan 3.2L V6
2008 Audi S6 Sedan 5.2L V10
2007 Audi A6 Sedan 3.2L V6
2008 Audi A6 Quattro Sedan 4.2L V8
2006 Audi A6 Quattro Sedan 4.2L V8
2005 Audi S4 Convertible 4.2L V8
2005 Audi A4 Quattro Wagon 3.0L V6
2005 Audi S4 Sedan 4.2L V8
2006 Audi A8 Quattro L Sedan 6.0L W12
2007 Audi A6 Quattro Sedan 3.2L V6
2007 Audi A8 Quattro L Sedan 6.0L W12
2003 Audi A6 Quattro Sedan 2.7L V6 Turbo
2004 Audi A8 Quattro L Sedan 4.2L V8 For Vehicles with Engine Code(s) BFM, BGK
2002 Audi A6 Quattro Sedan 2.7L V6 Turbo
2004 Audi A6 Quattro Sedan 2.7L V6 Turbo
2007 Audi S6 Sedan 5.2L V10
2005 Audi A4 Quattro Sedan 3.0L V6
2006 Audi A4 Quattro Convertible 3.0L V6 For Vehicles with Engine Code(s) AVK, BGN
2007 Audi S8 Sedan 5.2L V10
2004 Audi S4 Convertible 4.2L V8
2007 Audi A8 Quattro L Sedan 4.2L V8 For Vehicles with Engine Code(s) BFM, BGK
2006 Audi S4 Convertible 4.2L V8
2007 Audi A6 Quattro Wagon 3.2L V6
2005 Audi A4 Convertible 3.0L V6 For Vehicles with Engine Code(s) AVK, BGN
2005 Audi A6 Quattro Sedan 4.2L V8
2005 Audi A8 Quattro L Sedan 6.0L W12
2005 Audi A4 Sedan 3.0L V6
2004 Audi S4 Wagon 4.2L V8
2005 Audi A4 Quattro Convertible 3.0L V6 For Vehicles with Engine Code(s) AVK, BGN
2002 Audi A6 Quattro Wagon 3.0L V6
2002 Audi A6 Quattro Sedan 3.0L V6
2004 Audi A4 Quattro Wagon 3.0L V6
2004 Audi A6 Quattro Sedan 3.0L V6
2003 Audi A6 Quattro Sedan 3.0L V6
2003 Audi A6 Quattro Wagon 3.0L V6
2002 Audi A6 Sedan 3.0L V6
2003 Audi A4 Quattro Sedan 3.0L V6
2003 Audi A4 Quattro Wagon 3.0L V6
2011 Audi A6 Quattro Sedan 4.2L V8
2008 Audi A8 Quattro L Sedan 6.0L W12
2004 Audi A6 Quattro Wagon 3.0L V6
2004 Audi A4 Quattro Sedan 3.0L V6
2003 Audi A6 Sedan 3.0L V6
2004 Audi A4 Quattro Convertible 3.0L V6 For Vehicles with Engine Code(s) AVK, BGN
2009 Audi A6 Quattro Sedan 4.2L V8
2002 Audi A4 Quattro Sedan 3.0L V6
2002 Audi A4 Sedan 3.0L V6
2002 Audi A4 Quattro Wagon 3.0L V6
2004 Audi A4 Convertible 3.0L V6 For Vehicles with Engine Code(s) AVK, BGN
2004 Audi A6 Sedan 3.0L V6
2005 Audi A6 Quattro Sedan 3.2L V6
2011 Audi S6 Sedan 5.2L V10
2011 Audi A6 Quattro Sedan 3.0L V6 Supercharged
2009 Audi A8 Quattro L Sedan 4.2L V8
2005 Audi A8 Quattro Sedan 4.2L V8 For Vehicles with Engine Code(s) BFM, BGK
2006 Audi A6 Quattro Wagon 3.2L V6
2010 Audi A8 Quattro L Sedan 4.2L V8
2009 Audi A6 Quattro Wagon 3.0L V6 Supercharged
2010 Audi A8 Quattro Sedan 4.2L V8
2010 Audi A6 Quattro Sedan 3.0L V6 Supercharged
2009 Audi A6 Quattro Sedan 3.0L V6 Supercharged
2010 Audi S6 Sedan 5.2L V10
2011 Audi A6 Quattro Wagon 3.0L V6 Supercharged
2010 Audi A6 Quattro Wagon 3.0L V6 Supercharged
2002 Audi A4 Quattro Wagon 1.8L l4 Turbo
2002 Audi A4 Quattro Sedan 1.8L l4 Turbo
2004 Audi A4 Quattro Wagon 1.8L l4 Turbo
2002 Audi A4 Sedan 1.8L l4 Turbo
2003 Audi A4 Quattro Wagon 1.8L l4 Turbo
2003 Audi A4 Sedan 1.8L l4 Turbo
2004 Audi A4 Sedan 1.8L l4 Turbo
2004 Audi A4 Quattro Sedan 1.8L l4 Turbo
2003 Audi A4 Quattro Sedan 1.8L l4 Turbo
2010 Audi A6 Quattro Sedan 4.2L V8

Ask a parts specialist

Asking about: Coolant Reservoir / Tank / Bottle Cap 8E0121321 · OEM #8E0121321