Genuine Audi Coolant Reservoir Cap

Coolant Overflow Reservoir Cap

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15 Coolant Reservoir Caps found

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Audi Reservoir Cap Part Number: 3B0-121-321
$23.24 MSRP: $37.18
You Save: $13.94 (38%)
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Product Specifications
- Other Name: Cover; Cap, Radiator Cap
Fits the following Audi Models:
- A3 | 2006-2013 | Base, TDI | 4 Cyl 2.0 L DIESEL, 4 Cyl 2.0 L GAS
- A3 Quattro | 2006-2013 | Base | 4 Cyl 2.0 L GAS, 6 Cyl 3.2 L GAS
- A3 Sportback e-tron | 2016-2017 | Premium, Premium Plus, Prestige | 4 Cyl 1.4 L PLUG-IN HYBRID EV-GAS (PHEV)
- A4 | 2005-2016, 1998-2001 | Avant, Base, Cabriolet, Premium, Premium Plus, Prestige | 4 Cyl 1.8 L GAS, 4 Cyl 2.0 L GAS, 6 Cyl 2.8 L GAS, 6 Cyl 3.2 L GAS
- A4 Quattro | 2005-2016, 1998-2001 | Avant, Base, Cabriolet, Premium, Premium Plus, Prestige | 4 Cyl 1.8 L GAS, 4 Cyl 2.0 L FLEX, 4 Cyl 2.0 L GAS, 6 Cyl 2.8 L GAS, 6 Cyl 3.2 L GAS
- A5 | 2010-2014 | Cabriolet | 4 Cyl 2.0 L GAS
- A5 Quattro | 2008-2017 | Base, Cabriolet, Premium, Premium Plus, Prestige, Sport | 4 Cyl 2.0 L FLEX, 4 Cyl 2.0 L GAS, 6 Cyl 3.2 L GAS
- A6 | 2012-2018, 1998-2001 | Base, Premium, Premium Plus, Sport | 4 Cyl 2.0 L GAS, 6 Cyl 2.8 L GAS
- A6 Quattro | 2012-2018, 1998-2004 | Avant, Base, Competition, Premium, Premium Plus, Prestige, Sport, TDI Premium Plus, TDI Prestige | 4 Cyl 2.0 L GAS, 6 Cyl 2.8 L GAS, 6 Cyl 3.0 L DIESEL, 6 Cyl 3.0 L GAS, 8 Cyl 4.2 L GAS
- A7 Quattro | 2012-2018 | Base, Competition, Premium Plus, Prestige, TDI Premium Plus, TDI Prestige | 6 Cyl 3.0 L DIESEL, 6 Cyl 3.0 L GAS
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Audi Reservoir Cap Part Number: 4M0-121-321-Q
$43.55 MSRP: $59.98
You Save: $16.43 (28%)
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Product Specifications
- Other Name: Cap
- Replaces: 4M0-121-321-H, 4M0-121-321-J, 4M0-121-321-K
Fits the following Audi Models:
- A4 | 2017-2020 | Premium, Premium Plus, Prestige, Titanium | 4 Cyl 2.0 L GAS
- A4 allroad | 2017-2020 | Premium, Premium Plus, Prestige | 4 Cyl 2.0 L GAS
- A4 Quattro | 2017-2021 | Premium, Premium Plus, Prestige, Ultra sport | 4 Cyl 2.0 L GAS, 4 Cyl 2.0 L MILD HYBRID EV-GAS (MHEV)
- A5 Quattro | 2018-2024 | Premium, Premium Plus, Prestige | 4 Cyl 2.0 L GAS, 4 Cyl 2.0 L MILD HYBRID EV-GAS (MHEV)
- A5 Sportback | 2018-2024 | Premium, Premium Plus, Prestige | 4 Cyl 2.0 L GAS, 4 Cyl 2.0 L MILD HYBRID EV-GAS (MHEV)
- A6 allroad | 2020-2025 | Premium Plus, Prestige | 6 Cyl 3.0 L MILD HYBRID EV-GAS (MHEV)
- A6 Quattro | 2019-2025 | Premium, Premium Plus, Prestige | 4 Cyl 2.0 L GAS, 4 Cyl 2.0 L MILD HYBRID EV-GAS (MHEV), 6 Cyl 3.0 L MILD HYBRID EV-GAS (MHEV)
- A7 Sportback | 2019-2025 | Premium, Premium Plus, Prestige | 4 Cyl 2.0 L PLUG-IN HYBRID EV-GAS (PHEV), 6 Cyl 3.0 L MILD HYBRID EV-GAS (MHEV)
- A8 Quattro | 2019-2025 | L, L Plug-In Hybrid | 6 Cyl 3.0 L MILD HYBRID EV-GAS (MHEV), 6 Cyl 3.0 L PLUG-IN HYBRID EV-GAS (PHEV), 8 Cyl 4.0 L MILD HYBRID EV-GAS (MHEV)
- Q5 | 2018-2025 | Premium, Premium Plus, Prestige, Titanium Premium, Titanium Premium Plus, Titanium Prestige | 4 Cyl 2.0 L GAS, 4 Cyl 2.0 L MILD HYBRID EV-GAS (MHEV)
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Audi Auxiliary Radiator Cap Part Number: 4D0-133-335
$21.49 MSRP: $34.38
You Save: $12.89 (38%)
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Product Specifications
- Other Name: Cap; Lower Mount Cap, Radiator Cap, Radiator Coupling
Fits the following Audi Models:
- A6 allroad | 2020-2025 | Premium Plus, Prestige | 6 Cyl 3.0 L MILD HYBRID EV-GAS (MHEV)
- A6 Quattro | 2019-2025 | Premium, Premium Plus, Prestige | 6 Cyl 3.0 L MILD HYBRID EV-GAS (MHEV)
- A7 Sportback | 2019-2025 | Premium, Premium Plus, Prestige | 4 Cyl 2.0 L PLUG-IN HYBRID EV-GAS (PHEV), 6 Cyl 3.0 L MILD HYBRID EV-GAS (MHEV)
- A8 Quattro | 2019-2025, 2013-2016 | Base, L, L Plug-In Hybrid, L TDI | 6 Cyl 3.0 L DIESEL, 6 Cyl 3.0 L GAS, 6 Cyl 3.0 L MILD HYBRID EV-GAS (MHEV), 6 Cyl 3.0 L PLUG-IN HYBRID EV-GAS (PHEV), 8 Cyl 4.0 L MILD HYBRID EV-GAS (MHEV)
- Q5 | 2021-2025 | Premium, Premium Plus, Prestige | 4 Cyl 2.0 L MILD HYBRID EV-GAS (MHEV)
- Q5 PHEV | 2020-2025 | Premium, Premium Plus, Prestige | 4 Cyl 2.0 L PLUG-IN HYBRID EV-GAS (PHEV)
- Q5 Sportback | 2021-2025 | Premium, Premium Plus, Prestige | 4 Cyl 2.0 L MILD HYBRID EV-GAS (MHEV)
- Q7 | 2020-2025 | Premium, Premium Plus, Prestige | 6 Cyl 3.0 L MILD HYBRID EV-GAS (MHEV)
- Q8 | 2019-2025 | Premium, Premium Plus, Prestige | 6 Cyl 3.0 L MILD HYBRID EV-GAS (MHEV)
- RS Q8 | 2020-2025 | Base | 8 Cyl 4.0 L MILD HYBRID EV-GAS (MHEV)
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Audi Reservoir Cap Part Number: 2Q0-121-321-A
$26.86 MSRP: $42.98
You Save: $16.12 (38%)
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Product Specifications
- Other Name: Cover; Cap
- Replaces: 3C0-121-321, 2Q0-121-321
Fits the following Audi Models:
- A3 | 2022-2024, 2017-2020 | Premium, Premium Plus, Prestige, Titanium | 4 Cyl 2.0 L GAS, 4 Cyl 2.0 L MILD HYBRID EV-GAS (MHEV)
- A3 Quattro | 2022-2025, 2015-2020 | Premium, Premium Plus, Prestige | 4 Cyl 2.0 L GAS, 4 Cyl 2.0 L MILD HYBRID EV-GAS (MHEV)
- A3 Sportback e-tron | 2017-2018 | Premium, Premium Plus, Prestige | 4 Cyl 1.4 L PLUG-IN HYBRID EV-GAS (PHEV)
- A7 Sportback | 2021-2022 | Premium Plus, Prestige | 4 Cyl 2.0 L PLUG-IN HYBRID EV-GAS (PHEV)
- A8 Quattro | 2020-2021 | L Plug-In Hybrid | 6 Cyl 3.0 L PLUG-IN HYBRID EV-GAS (PHEV)
- Q3 | 2018-2025 | Premium, Premium Plus, Prestige, S-Line Premium, S-Line Premium Plus, S-Line Prestige | 4 Cyl 2.0 L GAS
- Q3 Quattro | 2018 | Premium, Premium Plus | 4 Cyl 2.0 L GAS
- Q4 e-tron | 2022-2025 | Premium, Premium Plus, Prestige | BATTERY EV (EV/BEV)
- Q4 e-tron Sportback | 2022-2025 | Premium, Premium Plus, Prestige | BATTERY EV (EV/BEV)
- Q5 | 2021-2025 | Premium, Premium Plus, Prestige | 4 Cyl 2.0 L MILD HYBRID EV-GAS (MHEV)
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Audi Reservoir Cap Part Number: 8E0-121-321
$34.86 MSRP: $55.78
You Save: $20.92 (38%)
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Product Specifications
- Other Name: Cover; Cap
Fits the following Audi Models:
- A4 | 2002-2006 | Base, Cabriolet | 4 Cyl 1.8 L GAS, 6 Cyl 3.0 L GAS
- A4 Quattro | 2002-2006 | Avant, Base, Cabriolet | 4 Cyl 1.8 L GAS, 6 Cyl 3.0 L GAS
- A6 | 2006-2011, 2002-2004 | Base | 6 Cyl 3.0 L GAS, 6 Cyl 3.2 L GAS
- A6 Quattro | 2000-2011 | Avant, Base | 6 Cyl 2.7 L GAS, 6 Cyl 3.0 L GAS, 6 Cyl 3.2 L GAS, 8 Cyl 4.2 L GAS
- A8 Quattro | 2004-2010 | Base, L | 12 Cyl 6.0 L GAS, 8 Cyl 4.2 L GAS
- S4 | 2004-2006 | Avant, Base, Cabriolet | 8 Cyl 4.2 L GAS
- S6 | 2007-2011 | Base | 10 Cyl 5.2 L GAS
- S8 | 2007-2009 | Base | 10 Cyl 5.2 L GAS
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Audi Reservoir Cap Part Number: 420-121-321
$233.24 MSRP: $326.66
You Save: $93.42 (29%)
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Product Specifications
- Other Name: Cover; Cap
Fits the following Audi Models:
- R8 | 2014-2015, 2008-2012 | Base, GT, GT Spyder, Plus, Spyder | 10 Cyl 5.2 L GAS, 8 Cyl 4.2 L GAS
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Audi Reservoir Cap Part Number: 4B3-121-321
$42.35 MSRP: $58.34
You Save: $15.99 (28%)
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Product Specifications
- Other Name: Cover; Cap
Fits the following Audi Models:
- R8 | 2014-2015 | Spyder | 10 Cyl 5.2 L GAS, 8 Cyl 4.2 L GAS
- RS5 | 2013-2015 | Base, Cabriolet | 8 Cyl 4.2 L GAS
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Audi Reservoir Cap Part Number: 4M0-121-321-R
$18.51 MSRP: $29.62
You Save: $11.11 (38%)
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Product Specifications
- Other Name: Cap
Fits the following Audi Models:
- A4 | 2020 | Premium, Premium Plus, Prestige | 4 Cyl 2.0 L GAS
- A4 allroad | 2021-2025 | Premium, Premium Plus, Prestige | 4 Cyl 2.0 L MILD HYBRID EV-GAS (MHEV)
- A4 Quattro | 2020-2025 | Premium, Premium Plus, Prestige, Ultra sport | 4 Cyl 2.0 L GAS, 4 Cyl 2.0 L MILD HYBRID EV-GAS (MHEV)
- A5 Quattro | 2021-2024 | Premium, Premium Plus, Prestige | 4 Cyl 2.0 L MILD HYBRID EV-GAS (MHEV)
- A5 Sportback | 2021-2025 | Premium, Premium Plus, Prestige | 4 Cyl 2.0 L MILD HYBRID EV-GAS (MHEV)
- Q5 | 2021-2024 | Premium, Premium Plus, Prestige | 4 Cyl 2.0 L MILD HYBRID EV-GAS (MHEV)
- Q5 Sportback | 2021-2024 | Premium, Premium Plus, Prestige | 4 Cyl 2.0 L MILD HYBRID EV-GAS (MHEV)
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Audi Reservoir Cap Part Number: 8B3-121-321
$14.03 MSRP: $22.44
You Save: $8.41 (38%)
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Product Specifications
- Other Name: Cap
- Replaces: 4KE-121-321-A
Fits the following Audi Models:
- e-tron Quattro | 2021-2023, 2019 | Chronos Edition, Premium, Premium Plus, Prestige | BATTERY EV (EV/BEV)
- e-tron S | 2022-2023 | Premium Plus, Prestige | BATTERY EV (EV/BEV)
- e-tron S Sportback | 2022-2023 | Premium Plus, Prestige | BATTERY EV (EV/BEV)
- e-tron Sportback | 2020-2023 | Premium, Premium Plus, Prestige | BATTERY EV (EV/BEV)
- Q6 e-tron | 2025 | Premium, Premium Plus, Prestige | BATTERY EV (EV/BEV)
- Q8 e-tron | 2024 | Launch Edition, Premium, Premium Plus, Prestige | BATTERY EV (EV/BEV)
- Q8 e-tron Sportback | 2024-2025 | Launch Edition, Premium, Premium Plus, Prestige | BATTERY EV (EV/BEV)
- SQ6 e-tron | 2025 | Premium, Premium Plus, Prestige | BATTERY EV (EV/BEV)
- SQ8 e-tron | 2024 | Premium Plus, Prestige | BATTERY EV (EV/BEV)
- SQ8 e-tron Sportback | 2024-2025 | Premium Plus, Prestige | BATTERY EV (EV/BEV)
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Audi Reservoir Cap Part Number: 1J0-121-321-B
$24.74 MSRP: $39.59
You Save: $14.85 (38%)
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Product Specifications
- Other Name: Cover
Fits the following Audi Models:
- Q7 | 2011-2015 | Premium, Premium Plus, Prestige, TDI Premium, TDI Premium Plus, TDI Prestige | 6 Cyl 3.0 L DIESEL, 6 Cyl 3.0 L GAS
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Audi Reservoir Cap Part Number: 5Q0-121-321
$36.25 MSRP: $58.00
You Save: $21.75 (38%)
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Product Specifications
- Other Name: Cover; Cap
Fits the following Audi Models:
- A3 | 2015-2018 | Premium, Premium Plus, Prestige, TDI Premium, TDI Premium Plus, TDI Prestige | 4 Cyl 1.8 L GAS, 4 Cyl 2.0 L DIESEL, 4 Cyl 2.0 L GAS
- A3 Quattro | 2015-2018 | Premium, Premium Plus, Prestige | 4 Cyl 2.0 L GAS
- A3 Sportback e-tron | 2016-2017 | Premium, Premium Plus, Prestige | 4 Cyl 1.4 L PLUG-IN HYBRID EV-GAS (PHEV)
- A8 Quattro | 2011-2018 | Base, L, L Sport, L TDI, L W12 | 12 Cyl 6.3 L GAS, 6 Cyl 3.0 L DIESEL, 6 Cyl 3.0 L GAS, 8 Cyl 4.0 L GAS, 8 Cyl 4.2 L GAS
- Q3 | 2015-2017 | Premium, Premium Plus, Prestige | 4 Cyl 2.0 L GAS
- Q3 Quattro | 2015-2017 | Premium, Premium Plus, Prestige | 4 Cyl 2.0 L GAS
- RS3 | 2017-2018 | Base | 5 Cyl 2.5 L GAS
- S3 | 2015-2017 | Premium Plus, Prestige | 4 Cyl 2.0 L GAS
- S8 | 2013-2018 | Base, Plus | 8 Cyl 4.0 L GAS
- TT | 2009 | Base | 4 Cyl 2.0 L GAS
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Audi Reservoir Cap Part Number: 8R0-121-585
$2.46 MSRP: $3.84
You Save: $1.38 (36%)
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Product Specifications
- Other Name: Grommet
Fits the following Audi Models:
- Q5 | 2009-2012 | Premium, Premium Plus, Prestige | 4 Cyl 2.0 L GAS, 6 Cyl 3.2 L GAS
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Audi Reservoir Cap Part Number: 1J0-121-422
$3.64 MSRP: $5.68
You Save: $2.04 (36%)
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Product Specifications
- Other Name: Cap
Fits the following Audi Models:
- TT | 2000-2006 | Base | 4 Cyl 1.8 L GAS
- TT Quattro | 2000-2006 | ALMS Edition, Base, Special Edition | 4 Cyl 1.8 L GAS, 6 Cyl 3.2 L GAS
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Audi Reservoir Cap Part Number: 9J1-121-321
$10.55 MSRP: $16.48
You Save: $5.93 (36%)
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Product Specifications
- Other Name: Cap
Fits the following Audi Models:
- e-tron GT | 2022-2024 | Premium Plus, Prestige | BATTERY EV (EV/BEV)
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Audi Reservoir Cap Part Number: 1C9-121-321
$40.28 MSRP: $55.48
You Save: $15.20 (28%)
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Product Specifications
- Other Name: Cover
Fits the following Audi Models:
- Q7 | 2007-2012 | Base, Premium, Prestige, TDI, TDI Premium, TDI Premium Plus, TDI Prestige | 6 Cyl 3.0 L DIESEL, 6 Cyl 3.6 L GAS, 8 Cyl 4.2 L GAS

Audi Coolant Reservoir Cap

Stick with genuine OEM Coolant Reservoir Cap when you need quality that holds up. Audi crafts these parts to hit strict factory specs for every single unit. They also run each part through rigorous checks during production to maintain high quality. You can find exact Audi Coolant Reservoir Cap you need in our huge stock at AudiPartsGiant.com. You'll love our low, economical prices too. Every OEM part carries a real manufacturer's warranty, so you can buy with confidence. Returns aren't a headache here because our policy is simple. Plus, our speedy delivery gets orders out fast. Shop today and buy with total peace of mind.