Genuine Audi Audi Reservoir Cap 5Q0121321 OEM - Audi (5Q0-121-321)
2009-2018 Audi - 5q0121321
Genuine Audi Audi Reservoir Cap 5Q0121321 OEM - Audi (5Q0-121-321)
2009-2018 Audi - 5q0121321
- Audi
- 5Q0-121-321
Details
- Brand:
- SKU:
5Q0-121-321
- Other Names:
Reservoir Cap, Radiator Cap, Cover
- Description:
Genuine Audi Cap 5Q0-121-321 is the factory-specified coolant expansion tank cap engineered to maintain precise pressure within the engine cooling system across a wide range of compatible Audi vehicles. This OEM reservoir cap seals the coolant tank and regulates system pressure to support proper coolant circulation, boiling point control, and overall thermal management — functions that depend entirely on a cap that opens and closes at the exact pressure thresholds Audi engineers designed for your specific engine. Unlike aftermarket radiator caps that are built to generic pressure tolerances, the OEM Audi is manufactured to match the factory relief valve specifications precisely, preventing premature coolant loss, overheating, and potential damage to hoses, seals, and the expansion tank itself. A poorly sealing or incorrectly rated cap can allow coolant to boil at lower temperatures or vent prematurely, compromising the entire cooling system's reliability. Choosing genuine OEM over aftermarket for a pressure-regulating component like this cover is not simply a preference — it is a safeguard for your engine's longevity. Searching for OEM Audi coolant reservoir cap or Audi 5Q0-121-321 replacement? Audi Henderson is an authorized Audi dealer offering this genuine part backed by the manufacturer's warranty for complete peace of mind.
- Applications: 2.5L.
California Proposition 65
WARNING: Cancer and reproductive harm - www.P65Warnings.ca.gov - MSRP: $58.00
- Discount: $25.81 (44.5% off)
- Sale Price: $32.19
- Audi
- 5Q0-121-321
Details
- Brand:
- SKU:
5Q0-121-321
- Other Names:
Reservoir Cap, Radiator Cap, Cover
- Description:
Genuine Audi Cap 5Q0-121-321 is the factory-specified coolant expansion tank cap engineered to maintain precise pressure within the engine cooling system across a wide range of compatible Audi vehicles. This OEM reservoir cap seals the coolant tank and regulates system pressure to support proper coolant circulation, boiling point control, and overall thermal management — functions that depend entirely on a cap that opens and closes at the exact pressure thresholds Audi engineers designed for your specific engine. Unlike aftermarket radiator caps that are built to generic pressure tolerances, the OEM Audi is manufactured to match the factory relief valve specifications precisely, preventing premature coolant loss, overheating, and potential damage to hoses, seals, and the expansion tank itself. A poorly sealing or incorrectly rated cap can allow coolant to boil at lower temperatures or vent prematurely, compromising the entire cooling system's reliability. Choosing genuine OEM over aftermarket for a pressure-regulating component like this cover is not simply a preference — it is a safeguard for your engine's longevity. Searching for OEM Audi coolant reservoir cap or Audi 5Q0-121-321 replacement? Audi Henderson is an authorized Audi dealer offering this genuine part backed by the manufacturer's warranty for complete peace of mind.
- Applications: 2.5L.
California Proposition 65
WARNING: Cancer and reproductive harm - www.P65Warnings.ca.gov Also Purchased
Vehicle Fitment
| Year | Make | Model | Body & Trim | Engine & Transmission |
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AUDI HENDERSON
Welcome to Audi OEM Parts, your number one source for all things Audi. We're dedicated to providing you the very best parts and accessories, with an emphasis on OEM fitment.
You can order your Genuine Audi Audi Reservoir Cap 5Q0121321 OEM (5q0121321) right now and have it delivered to your home or work in just a matter of days. Guaranteed to fit your 2009-2018 Audi vehicle and we also offer a VIN verification system at checkout.
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Audi
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Every part ships directly from factory inventory with full Audi manufacturer warranty. No aftermarket substitutes. No compatibility guessing. Exact fit, every time.
Order online and ship nationwide. Same parts Audi technicians use, at authorized dealer pricing, with the speed of online ordering. Questions? Call 888-448-6114 or email [email protected].