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Audi B8 Cooling Expansion Tank Parts

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Expansion Tank Cap

ES#2709040 - 3B0121321 - Expansion Tank Cap - Keep proper pressure in your coolant system - URO - Audi Volkswagen

Keep proper pressure in your coolant system 2X Entries Into Our F80 M3 Sweepstakes
We Price Match - Give Us A Call or Chat!

Brand:
URO - Corporate Logo
ES#:
2709040
Mfg#:
3B0121321
In Stock
$5.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Expansion Tank Replacement Kit

ES#2678370 - 8K0121405NKT - Expansion Tank Replacement Kit - Install a brand new expansion tank with a new cap and hardware - Assembled By ECS - Audi

Install a brand new expansion tank with a new cap and hardware 10X Entries Into Our F80 M3 Sweepstakes

Brand:
Assembled By ECS - Corporate Logo
ES#:
2678370
Mfg#:
8K0121405NKT
In Stock
ON SALE! SAVE 18%
$86.99

This product was last offered at the strikethrough price on
05-02-2026

$71.61 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Coolant Expansion Tank

ES#4148659 - 80A121405AQ - Coolant Expansion Tank - See your coolant levels clearly again, comes with coolant level sensor - Genuine Volkswagen Audi - Audi

See your coolant levels clearly again, comes with coolant level sensor For vehicles with model year up through 2020 (engine code DJYA)

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
4148659
Mfg#:
80A121405AQ
Ships in 1-2 days
12% off MSRP

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$271.99

This product was last offered at the strikethrough price on
08-31-2026

$239.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Coolant Expansion Tank

ES#5425890 - 8K0121405M - Coolant Expansion Tank - Includes the heat shield - Bremmen Parts - Audi

Includes the heat shield 10X Entries Into Our F80 M3 Sweepstakes

Brand:
Bremmen Parts - Corporate Logo
ES#:
5425890
Mfg#:
8K0121405M
Ships on Feb 24, 2027
ON SALE! SAVE 20%
$40.99

This product was last offered at the strikethrough price on
05-02-2026

$32.63 USD
Free Shipping
on orders $49 and up

Coolant Expansion Tank

ES#3469661 - 8K0121405M - Coolant Expansion Tank - Includes the heat shield - Rein - Audi

Includes the heat shield 2X Entries Into Our F80 M3 Sweepstakes
We Price Match - Give Us A Call or Chat!
Up to production date 3/11/2008

Brand:
Rein - Corporate Logo
ES#:
3469661
Mfg#:
8K0121405M
Ships in 3 Business Days
$103.99

This product was last offered at the strikethrough price on
10-22-2026

$44.19 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Plastic Coolant Hose

ES#3212553 - 80A121081S - Plastic Coolant Hose - Connects the expansion tank to the radiator - Genuine Volkswagen Audi - Audi

Connects the expansion tank to the radiator

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
3212553
Mfg#:
80A121081S
Ships in 1-2 days
11% off MSRP

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$106.99

This product was last offered at the strikethrough price on
08-31-2026

$94.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Coolant Expansion Tank Hose

ES#4809603 - 8K0121081AH - Coolant Expansion Tank Hose - Located between the coolant expansion tank and the cylinder head coolant flange - Rein - Audi

Located between the coolant expansion tank and the cylinder head coolant flange 2X Entries Into Our F80 M3 Sweepstakes
We Price Match - Give Us A Call or Chat!

Brand:
Rein - Corporate Logo
ES#:
4809603
Mfg#:
8K0121081AH
Ships in 3 Business Days
$53.99 USD
Free Shipping
on orders $49 and up

Expansion Tank Cap - Black

ES#4004591 - 5Q0121321 - Expansion Tank Cap - Black - Keep proper pressure in your coolant system - Rein - Audi Volkswagen Porsche

Keep proper pressure in your coolant system 2X Entries Into Our F80 M3 Sweepstakes
We Price Match - Give Us A Call or Chat!

Brand:
Rein - Corporate Logo
ES#:
4004591
Mfg#:
5Q0121321
In Stock
$16.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Coolant Expansion Tank

ES#4163739 - 80A121405AG - Coolant Expansion Tank - See your coolant levels clearly again, comes with coolant level sensor - Genuine Volkswagen Audi - Audi

See your coolant levels clearly again, comes with coolant level sensor For vehicles with model year from 2021+ (engine code DPVA)

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
4163739
Mfg#:
80A121405AG
Ships in 1-2 days
12% off MSRP

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$200.00

This product was last offered at the strikethrough price on
05-01-2026

$176.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Expansion Tank Upper Hose

ES#5433827 - 8K0121081AB - Expansion Tank Upper Hose - Overflow relief hose for the radiator - URO - Audi

Overflow relief hose for the radiator 2X Entries Into Our F80 M3 Sweepstakes

Brand:
URO - Corporate Logo
ES#:
5433827
Mfg#:
8K0121081AB
In Stock
$23.50 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Screw - Priced Each

ES#471868 - N91090701 - Screw - Priced Each - Install new hardware with your new parts. 5x20 - Genuine Volkswagen Audi - Audi

Install new hardware with your new parts. 5x20 Used to secure the coolant expansion tank

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
471868
Mfg#:
N91090701
In Stock
25% off MSRP

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$3.99

This product was last offered at the strikethrough price on
10-24-2026

$2.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Expansion Tank Replacement Kit

ES#3677963 - 8t0121405KT - Expansion Tank Replacement Kit - Composed of genuine Audi parts to fix your leaking coolant expansion tank. - Genuine Volkswagen Audi - Audi

Composed of genuine Audi parts to fix your leaking coolant expansion tank.

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
3677963
Mfg#:
8T0121405KT
Ships in 8 Business Days
$348.99

This product was last offered at the strikethrough price on
08-31-2026

$336.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Partial Replacement

Coolant Expansion Tank

ES#4883484 - 8K0121405S - Coolant Expansion Tank - Includes the heat shield and cap - Rein - Audi

Includes the heat shield and cap 2X Entries Into Our F80 M3 Sweepstakes
We Price Match - Give Us A Call or Chat!

Brand:
Rein - Corporate Logo
ES#:
4883484
Mfg#:
8K0121405S
In Stock at Vendor
$52.99 USD
Free Shipping
on orders $49 and up

Coolant T Connector

ES#3623904 - N90692901 - Coolant T Connector - Connects to the lower radiator hose - URO - Audi Volkswagen

Connects to the lower radiator hose 2X Entries Into Our F80 M3 Sweepstakes
We Price Match - Give Us A Call or Chat!
Connects lower radiator hose to the coolant expansion tank hose and water pump hose

Brand:
URO - Corporate Logo
ES#:
3623904
Mfg#:
N90692901
Ships in 1 Business Day
$11.00 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Water Hose

ES#1598006 - 8K0121109AB - Water Hose - Connects from expansion tank to water pipe - Genuine Volkswagen Audi - Audi

Connects from expansion tank to water pipe

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
1598006
Mfg#:
8K0121109AB
Ships in 1-2 days
9% off MSRP

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$103.99

This product was last offered at the strikethrough price on
10-24-2026

$94.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

expansion tank hose - Lower

ES#1285734 - 8R0121109 - expansion tank hose - Lower - Connects the expansion tank to the t-fitting - Genuine Volkswagen Audi - Audi

Connects the expansion tank to the t-fitting

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
1285734
Mfg#:
8R0121109
Ships in 1-2 days
12% off MSRP

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$103.99

This product was last offered at the strikethrough price on
08-31-2026

$91.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

More About Cooling Expansion Tank Parts

A common source of overheating problems is a broken or leaking coolant expansion tank. Replace it with an OEM coolant expansion tank or quality aftermarket expansion tank to prevent future woes.

Let us help you find the parts that fit your Audi

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Manufacturer names and/or part numbers are used only for identification purposes.

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