Audi A4/A5/Q5/S5/SQ5 Coolant Reservoir / Tank / Bottle 8K0121405M

OEM Part #: 8K0-121-405-M (8K0121405M)

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Audi coolant reservoir, tank, or bottle, OEM part number 8K0121405M. This is a used genuine OEM part, also superseding 8K0121405G and 8K0121405E. It stores and supplies coolant to the engine's cooling system, maintaining proper operating temperature. A common failure is a cracked plastic seam or a failed level sensor, leading to visible coolant leaks or a low-coolant warning light. This part fits several 3.0L and 3.2L V6 and 4.2L V8 engines from Audi A4, A5, and Q5 models.

Specifications

Specifications for Coolant Reservoir / Tank / Bottle 8K0121405M
Fits Vehicle ModelA4, A5, Q5, S5, SQ5
Fits Vehicle MakeAudi
OEM Part No8K0-121-405-M (8K0121405M)
Compatible OEM Part No 8K0-121-405-G, 8K0-121-405-E
CategoryRadiator / Coolant

Compatible Vehicles

Fits 20 vehicle configurations across 1 make, 2008-2017.

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 2009 1 with note
  • A5 2008-2009 · 2 variants 2 with notes
  • Q5 2013-2017 · 8 variants
  • S5 2008-2012 · 5 variants
  • SQ5 2014-2017 · 4 variants
View all 20 vehicle configurations — 3 with fitment notes
Full vehicle fitment list for Coolant Reservoir / Tank / Bottle 8K0121405M
Year Make Model Trim Engine Note
2008 Audi A5 Quattro Coupe 3.2L V6 For Vehicles With Production date Up To 03/11/08
2008 Audi S5 Coupe 4.2L V8
2009 Audi A4 Quattro Sedan 3.2L V6 For Vehicles With Production date Up To 03/29/08
2009 Audi A5 Quattro Coupe 3.2L V6 For Vehicles With Production date Up To 03/11/08
2009 Audi S5 Coupe 4.2L V8
2010 Audi S5 Coupe 4.2L V8
2011 Audi S5 Coupe 4.2L V8
2012 Audi S5 Coupe 4.2L V8
2013 Audi Q5 SUV 3.0L V6 Supercharged
2014 Audi Q5 SUV 3.0L V6 Supercharged
2014 Audi Q5 SUV 3.0L V6 Diesel Turbo
2014 Audi SQ5 SUV 3.0L V6 Supercharged
2015 Audi Q5 SUV 3.0L V6 Supercharged
2015 Audi Q5 SUV 3.0L V6 Diesel Turbo
2015 Audi SQ5 SUV 3.0L V6 Supercharged
2016 Audi Q5 SUV 3.0L V6 Supercharged
2016 Audi Q5 SUV 3.0L V6 Diesel Turbo
2016 Audi SQ5 SUV 3.0L V6 Supercharged
2017 Audi Q5 SUV 3.0L V6 Supercharged
2017 Audi SQ5 SUV 3.0L V6 Supercharged

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