Audi / Porsche Coolant Reservoir / Tank / Bottle 8K0121403G
OEM Part #: 8K0-121-403-G (8K0121403G)
Actual photo
The exact part you’ll receive — not a stock photo.
$29.99
Save 62% vs new
Used
Donor Vehicle2009 Audi A4 · 2.0L
New price~$78 from the dealer
✓ Free Same Day Shipping on orders by noon CT
Only 1 in stock — no guaranteed restock
-
Genuine OEM Used
SKU: 717284
Donor Vehicle: 2009 Audi A4 · 2.0L
$29.99
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
Ensure dependable engine cooling with this authentic OEM coolant reservoir (Part Number: 8K0121403G) for select Audi models. Designed for seamless integration, this expansion tank fits a variety of vehicles, including the 2013-2016 Audi A4, A5, Q5, and allroad, covering 2.0L and 3.2L engine variants. This factory-original part prevents coolant leaks and ensures optimal engine temperature, resolving issues associated with worn or damaged reservoirs. Alternative names include coolant tank and expansion tank, emphasizing its critical role in the cooling system. Restore your vehicle’s performance and reliability with this genuine part from salvage operations. Compatible with multiple Audi part numbers like 8K0121403D and 8K0121403H.
Specifications
| Fits Vehicle Model | A4, A5, allroad, Macan, Q5 |
| Fits Vehicle Make | Audi, Porsche |
| OEM Part No | 8K0-121-403-G (8K0121403G) |
| Compatible OEM Part No | 8K0-121-403-D, 8K0-121-403-H, 8K0-121-403-Q |
| Category | Radiator / Coolant |
Compatible Vehicles
Fits 46 vehicle configurations across 2 makes, 2009-2018.
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.
View all 46 vehicle configurations — 26 with fitment notes
| Year | Make | Model | Trim | Engine | Note |
|---|---|---|---|---|---|
| 2009 | Audi | A4 | Sedan | 2.0L l4 Turbo | For Vehicles With Production date Up To 05/02/11 |
| 2009 | Audi | A4 | Quattro Wagon | 2.0L l4 Turbo | For Vehicles With Production date Up To 05/02/11 |
| 2009 | Audi | A4 | Quattro Sedan | 2.0L l4 Turbo | For Vehicles With Production date Up To 05/02/11 |
| 2010 | Audi | A4 | Sedan | 2.0L l4 Turbo | For Vehicles With Production date Up To 05/02/11 |
| 2010 | Audi | A4 | Quattro Wagon | 2.0L l4 Turbo | For Vehicles With Production date Up To 05/02/11 |
| 2010 | Audi | A4 | Quattro Sedan | 2.0L l4 Turbo | For Vehicles With Production date Up To 05/02/11 |
| 2010 | Audi | A5 | Convertible | 2.0L l4 Turbo | For Vehicles with Engine Code(s) CAHA, CAHB, CDNB, CDNC |
| 2010 | Audi | A5 | Quattro Coupe | 2.0L l4 Turbo | |
| 2010 | Audi | A5 | Quattro Convertible | 2.0L l4 Turbo | For Vehicles with Engine Code(s) CAHA, CAHB, CDNB, CDNC |
| 2011 | Audi | A4 | Sedan | 2.0L l4 Turbo | For Vehicles With Production date Up To 05/02/11 |
| 2011 | Audi | A4 | Quattro Wagon | 2.0L l4 Turbo | For Vehicles With Production date Up To 05/02/11 |
| 2011 | Audi | A4 | Quattro Sedan | 2.0L l4 Turbo | For Vehicles With Production date Up To 05/02/11 |
| 2011 | Audi | A5 | Convertible | 2.0L l4 Turbo | For Vehicles with Engine Code(s) CAHA, CAHB, CDNB, CDNC |
| 2011 | Audi | A5 | Quattro Convertible | 2.0L l4 Turbo | For Vehicles with Engine Code(s) CAHA, CAHB, CDNB, CDNC |
| 2011 | Audi | A5 | Quattro Coupe | 2.0L l4 Turbo | |
| 2011 | Audi | Q5 | SUV | 2.0L l4 Turbo | For Vehicles with Engine Code(s) CAEB, CAGA, CAGB, CAHA, CAHB, CDNB, CDNC, CGLA, CGLB, CJCB, CMGA |
| 2012 | Audi | A4 | Sedan | 2.0L l4 Turbo | For Vehicles With Production date Up To 05/02/11 |
| 2012 | Audi | A4 | Quattro Wagon | 2.0L l4 Turbo | For Vehicles With Production date Up To 05/02/11 |
| 2012 | Audi | A4 | Quattro Sedan | 2.0L l4 Turbo | For Vehicles With Production date Up To 05/02/11 |
| 2012 | Audi | A5 | Convertible | 2.0L l4 Turbo | For Vehicles with Engine Code(s) CAHA, CAHB, CDNB, CDNC |
| 2012 | Audi | A5 | Quattro Coupe | 2.0L l4 Turbo | |
| 2012 | Audi | A5 | Quattro Convertible | 2.0L l4 Turbo | For Vehicles with Engine Code(s) CAHA, CAHB, CDNB, CDNC |
| 2012 | Audi | Q5 | SUV | 2.0L l4 Turbo | For Vehicles with Engine Code(s) CAEB, CAGA, CAGB, CAHA, CAHB, CDNB, CDNC, CGLA, CGLB, CJCB, CMGA |
| 2013 | Audi | A4 | Sedan | 2.0L l4 Turbo | |
| 2013 | Audi | A4 | Quattro Sedan | 2.0L l4 Turbo | |
| 2013 | Audi | A5 | Quattro Coupe | 2.0L l4 Turbo | |
| 2013 | Audi | allroad | Wagon | 2.0L l4 Turbo | For Vehicles with Engine Code(s) CAGA, CAGB, CAHA, CAHB, CDNC |
| 2013 | Audi | Q5 | SUV | 2.0L l4 Turbo | |
| 2014 | Audi | A4 | Sedan | 2.0L l4 Turbo | |
| 2014 | Audi | A4 | Quattro Sedan | 2.0L l4 Turbo | |
| 2014 | Audi | A5 | Quattro Coupe | 2.0L l4 Turbo | |
| 2014 | Audi | allroad | Wagon | 2.0L l4 Turbo | For Vehicles with Engine Code(s) CAGA, CAGB, CAHA, CAHB, CDNC |
| 2014 | Audi | Q5 | SUV | 2.0L l4 Turbo | |
| 2015 | Audi | A4 | Sedan | 2.0L l4 Turbo | |
| 2015 | Audi | A4 | Quattro Sedan | 2.0L l4 Turbo | |
| 2015 | Audi | A5 | Quattro Coupe | 2.0L l4 Turbo | |
| 2015 | Audi | allroad | Wagon | 2.0L l4 Turbo | For Vehicles with Engine Code(s) CAGA, CAGB, CAHA, CAHB, CDNC |
| 2015 | Audi | Q5 | SUV | 2.0L l4 Turbo | |
| 2016 | Audi | A4 | Sedan | 2.0L l4 Turbo | |
| 2016 | Audi | A4 | Quattro Sedan | 2.0L l4 Turbo | |
| 2016 | Audi | A5 | Quattro Coupe | 2.0L l4 Turbo | |
| 2016 | Audi | allroad | Wagon | 2.0L l4 Turbo | For Vehicles with Engine Code(s) CAGA, CAGB, CAHA, CAHB, CDNC |
| 2016 | Audi | Q5 | SUV | 2.0L l4 Turbo | |
| 2017 | Audi | Q5 | SUV | 2.0L l4 Turbo | |
| 2017 | Porsche | Macan | SUV | 2.0L l4 Turbo | For Vehicles with Engine Code(s) CNC, CNCC, CYN, CYNA, CYNB, CYP, CYPA |
| 2018 | Porsche | Macan | SUV | 2.0L l4 Turbo | For Vehicles with Engine Code(s) CNC, CNCC, CYN, CYNA, CYNB, CYP, CYPA |