Genuine Audi Radiator Cap

Cooling Radiator Cap

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9 Radiator Caps found

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Audi Auxiliary Radiator Cap
Part Number: 4D0-133-335
$18.75 MSRP: $30.00
You Save: $11.25 (38%)
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Product Specifications
- Other Name: Cap; Radiator Cap
Fits the following Audi Models:
- A6 Quattro | 2019-2023 | Premium, Premium Plus, Prestige | 6 Cyl 3.0 L MILD HYBRID EV-GAS (MHEV)
- A6 allroad | 2020-2023 | Premium Plus, Prestige | 6 Cyl 3.0 L MILD HYBRID EV-GAS (MHEV)
- A7 Sportback | 2019-2023 | 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 | 2019-2023, 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 | 2021-2023 | Premium, Premium Plus, Prestige | 4 Cyl 2.0 L MILD HYBRID EV-GAS (MHEV)
- Q5 PHEV | 2020-2023 | Premium, Premium Plus, Prestige | 4 Cyl 2.0 L PLUG-IN HYBRID EV-GAS (PHEV)
- Q7 | 2020-2023 | Premium, Premium Plus, Prestige | 6 Cyl 3.0 L MILD HYBRID EV-GAS (MHEV)
- Q8 | 2019-2023 | Premium, Premium Plus, Prestige | 6 Cyl 3.0 L MILD HYBRID EV-GAS (MHEV)
- RS Q8 | 2020-2023 | Base | 8 Cyl 4.0 L MILD HYBRID EV-GAS (MHEV)
- RS5 | 2021-2024, 2019 | Base | 6 Cyl 2.9 L GAS
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Audi Reservoir Cap
Part Number: 3B0-121-321
$23.91 MSRP: $38.27
You Save: $14.36 (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: 8E0-121-321
$31.25 MSRP: $50.00
You Save: $18.75 (38%)
Ships in 1-2 Business Days
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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
$207.06 MSRP: $290.00
You Save: $82.94 (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
$36.60 MSRP: $50.42
You Save: $13.82 (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-Q
$40.54 MSRP: $55.83
You Save: $15.29 (28%)
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Product Specifications
- Other Name: Cap; Reservoir Cap
- Replaces: 4M0-121-321-J, 4M0-121-321-K, 4M0-121-321-H
Fits the following Audi Models:
- A4 | 2017-2020 | Premium, Premium Plus, Prestige, Titanium | 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)
- A4 allroad | 2017-2020 | Premium, Premium Plus, Prestige | 4 Cyl 2.0 L GAS
- A5 Quattro | 2018-2023 | Premium, Premium Plus, Prestige | 4 Cyl 2.0 L GAS, 4 Cyl 2.0 L MILD HYBRID EV-GAS (MHEV)
- A5 Sportback | 2018-2023 | Premium, Premium Plus, Prestige | 4 Cyl 2.0 L GAS, 4 Cyl 2.0 L MILD HYBRID EV-GAS (MHEV)
- A6 Quattro | 2019-2023 | 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)
- A6 allroad | 2020-2023 | Premium Plus, Prestige | 6 Cyl 3.0 L MILD HYBRID EV-GAS (MHEV)
- A7 Sportback | 2019-2023 | 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 | 2019-2023 | 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 | 2018-2023 | 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 Cap
Part Number: 4KE-121-321-A
$41.75 MSRP: $57.50
You Save: $15.75 (28%)
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Product Specifications
- Replaced by: 8B3-121-321
Fits the following Audi Models:
- e-tron Quattro | 2021-2023, 2019 | Chronos Edition, Premium, Premium Plus, Prestige | BATTERY EV (EV/BEV)
- e-tron Sportback | 2020-2023 | Premium, Premium Plus, Prestige | BATTERY EV (EV/BEV)
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Audi Expansion Tank
Part Number: 443-121-321
$55.74 MSRP: $76.78
You Save: $21.04 (28%)
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Product Specifications
- Other Name: Cover; Expansion Tank, Reservoir Cap
Fits the following Audi Models:
- 100 | 1989-1994 | Base, CS, E, S | 5 Cyl 2.3 L GAS, 6 Cyl 2.8 L GAS
- 100 Quattro | 1989-1994 | Base, CS | 5 Cyl 2.3 L GAS, 6 Cyl 2.8 L GAS
- 200 | 1989-1991 | Base | 5 Cyl 2.2 L GAS
- 200 Quattro | 1989-1991 | 20v, 20v Avant, Avant, Base | 5 Cyl 2.2 L GAS
- 5000 | 1984-1988 | CS, CS Turbo, S, S Turbo | 5 Cyl 2.2 L GAS, 5 Cyl 2.3 L GAS
- 5000 Quattro | 1986-1988 | CS, S | 5 Cyl 2.2 L GAS, 5 Cyl 2.3 L GAS
- 80 | 1988-1992 | Base | 4 Cyl 2.0 L GAS, 5 Cyl 2.3 L GAS
- 80 Quattro | 1988-1992 | Base | 5 Cyl 2.3 L GAS
- 90 | 1993-1995, 1988-1991 | Base, CS, S, Sport | 4 Cyl 2.0 L GAS, 5 Cyl 2.3 L GAS, 6 Cyl 2.8 L GAS
- 90 Quattro | 1993-1995, 1988-1991 | 20v, Base, CS, Sport | 5 Cyl 2.3 L GAS, 6 Cyl 2.8 L GAS
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Audi Reservoir Cap
Part Number: 2Q0-121-321-A
$26.00 MSRP: $34.67
You Save: $8.67 (26%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Cover; Cap, Reservoir Cap
- Replaces: 2Q0-121-321, 3C0-121-321
Fits the following Audi Models:
- A3 | 2022-2024, 2017-2020 | Premium, Premium Plus, Prestige, Titanium | 4 Cyl 2.0 L GAS
- A3 Quattro | 2022-2023, 2015-2020 | Premium, Premium Plus, Prestige | 4 Cyl 2.0 L GAS
- 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 | 2018-2024 | 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 | 2022-2024 | Premium, Premium Plus, Prestige | BATTERY EV (EV/BEV)
- Q4 e-tron Sportback | 2022-2024 | Premium, Premium Plus, Prestige | BATTERY EV (EV/BEV)
- Q5 | 2021-2023 | Premium, Premium Plus, Prestige | 4 Cyl 2.0 L MILD HYBRID EV-GAS (MHEV)
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Audi Radiator Cap

The Audi radiator cap is a vital element of the pressurized cooling system. It helps retain a certain pressure for the coolant, whereby extra steam escapes when it passes some specific threshold. Such steam is then directed to the overflow bottle. After the engine has cooled down, the level of coolant in the radiator drops, and a jacket leading from this bottle back to the radiator opens up through its valve due to pressure on it by fluid. If an individual's radiator cap is malfunctioning, it could cause too much or too little fluid release, thus interfering with how well-balanced this system is. You should be aware that if your car overheats or the overflow bottle fills up, these are all signs that your Audi radiator cap is going wrong. If you notice these problems, please stop driving and check the radiator cap immediately.

It is better to choose OEM parts when it comes to the time for fixing them. Why? Because they fit perfectly well and ensure safety. For people who prefer doing their maintenance, the genuine Audi Radiator Cap is quite perfect. At AudiPartsGiant.com, we specialize in genuine Audi Radiator Caps only. Also, we offer an extensive online catalog with many categories, ample stock, and secure shopping. The Audi Radiator Cap is shipped directly from authorized Audi dealers at competitive prices. So trust us, and we will give you nothing but superior service. Depend on us for all your genuine parts needs, and then we will keep your automobile moving smoothly.

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