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Audi B9 A4 Quattro 2.0T

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Audi B9 A4 Quattro 2.0T Engine Covers & Accessories

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Coolant Expansion Tank Cap

ES#4858532 - 2Q0121321A - Coolant Expansion Tank Cap - Keep proper pressure in your coolant system - Bremmen Parts - Audi Volkswagen Porsche

Keep proper pressure in your coolant system

Brand:
Bremmen Parts - Corporate Logo
ES#:
4858532
Mfg#:
2Q0121321A
In Stock
ON SALE! SAVE 22%
$19.99

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

$15.50 USD
Free Shipping
on orders $49 and up

Expansion Tank Cap - Black

ES#3690266 - 5Q0121321 - Expansion Tank Cap - Black - Keep proper pressure in your coolant system - Vaico - Audi Volkswagen Porsche

Keep proper pressure in your coolant system We Price Match - Give Us A Call or Chat!

Brand:
Vaico - Corporate Logo
ES#:
3690266
Mfg#:
5Q0121321
Ships in 1-2 days
$18.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

VTT VAG Billet One Way Crankcase Breather - Tall

ES#4370482 - VTT-VAG-CC-BTR-L - VTT VAG Billet One Way Crankcase Breather - Tall - First of it's kind for VW/Audi/Porsche vehicles! - Vargas Turbo Technologies - Audi Volkswagen Porsche

First of it's kind for VW/Audi/Porsche vehicles! For vehicles up through the 2020 model year only

Brand:
Vargas Turbo Technologies - Corporate Logo
ES#:
4370482
Mfg#:
VTT-VAG-CC-BTR-L
Ships in 10 Business Days
$156.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Billet Washer Fluid Reservoir Cap - Clear Anodized

ES#4039270 - 022732ECS01-02 - Billet Washer Fluid Reservoir Cap - Clear Anodized - Lose the plastic! - ECS - Audi

Lose the plastic!

Brand:
ECS - Corporate Logo
ES#:
4039270
Mfg#:
022732ECS01-02
In Stock
ON SALE! SAVE 33%
$71.99

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

$48.15 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

034Motorsport Billet Oil Cap

ES#4745412 - 034-110-Z015 - 034Motorsport Billet Oil Cap - Transform your engine bay with the beautiful and sexy 034Motorsport Billet Oil Cap. - 034Motorsport - Audi Volkswagen

Transform your engine bay with the beautiful and sexy 034Motorsport Billet Oil Cap. For vehicles from the 2021 model year only.

Brand:
034Motorsport - Corporate Logo
ES#:
4745412
Mfg#:
034-110-Z015
In Stock
ON SALE! SAVE 10%
$99.00

This product was last offered at the strikethrough price on
08-17-2026

$89.10 USD
Free Shipping

VTT VAG Billet One Way Crankcase Breather - Short

ES#4370481 - VTT-VAG-CC-BTR-S - VTT VAG Billet One Way Crankcase Breather - Short - First of it's kind for VW/Audi/Porsche vehicles! - Vargas Turbo Technologies - Audi Volkswagen Porsche

First of it's kind for VW/Audi/Porsche vehicles! For vehicles up through the 2020 model year only

Brand:
Vargas Turbo Technologies - Corporate Logo
ES#:
4370481
Mfg#:
VTT-VAG-CC-BTR-S
Ships in 10 Business Days
$156.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Billet Brake Fluid Cap - Black Anodized

ES#4039245 - 020809ECS01-01 - Billet Brake Fluid Cap - Black Anodized - Lose the plastic! - ECS - Audi Volkswagen

Lose the plastic!

Brand:
ECS - Corporate Logo
ES#:
4039245
Mfg#:
020809ECS01-01
Ships on Jan 4, 2027
$89.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Brake Reservoir Cap

ES#4716596 - 5Q0611349E - Brake Reservoir Cap - Clean up your engine bay with a new cap - Genuine Volkswagen Audi - Audi Volkswagen

Clean up your engine bay with a new cap

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
4716596
Mfg#:
5Q0611349E
In Stock
$15.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Billet Oil Cap - Clear

ES#4165016 - VTT-VAG-OILCAPC - Billet Oil Cap - Clear - Billet aluminum oil cap to spice up your engine bay. - Vargas Turbo Technologies - Audi Volkswagen Porsche

Billet aluminum oil cap to spice up your engine bay. For vehicles up through the 2020 model year only

Brand:
Vargas Turbo Technologies - Corporate Logo
ES#:
4165016
Mfg#:
VTT-VAG-OILCAPC
Back Ordered
Auto Notify
$62.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Dowel Pin - Priced Each

ES#4781655 - 3B0805121 - Dowel Pin - Priced Each - Used to secure the belly pan. 6x21.5mm - Bremmen Parts - Audi Volkswagen

Used to secure the belly pan. 6x21.5mm

Brand:
Bremmen Parts - Corporate Logo
ES#:
4781655
Mfg#:
3B0805121
In Stock
ON SALE! SAVE 30%
$6.99

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

$4.89 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Audi B9 Engine Bay Block Off Plugs - Set

ES#3667767 - 026829ECS01 - Audi B9 Engine Bay Block Off Plugs - Set - Keep your engine bay clean and pristine! - ECS - Audi

Keep your engine bay clean and pristine!

Brand:
ECS - Corporate Logo
ES#:
3667767
Mfg#:
026829ECS01
In Stock
ON SALE! SAVE 89%
$45.99

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

$4.88 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

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 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

Billet Oil Cap - Purple

ES#4165017 - VTT-VAG-OILCAPP - Billet Oil Cap - Purple - Billet aluminum oil cap to spice up your engine bay. - Vargas Turbo Technologies - Audi Volkswagen Porsche

Billet aluminum oil cap to spice up your engine bay. For vehicles up through the 2020 model year only

Brand:
Vargas Turbo Technologies - Corporate Logo
ES#:
4165017
Mfg#:
VTT-VAG-OILCAPP
Back Ordered
Auto Notify
$62.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Plug - priced each

ES#281421 - 06H115418P - Plug - priced each - Seals valve cover opening - Genuine Volkswagen Audi - Audi Volkswagen

Seals valve cover opening

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
281421
Mfg#:
06H115418P
Ships on Aug 24, 2026
20% off MSRP

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

$3.84

This product was last offered at the strikethrough price on
08-22-2026

$3.09 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Billet Oil Cap - Full Replacement

ES#4140299 - L102B - Billet Oil Cap - Full Replacement - Replace the factory plastic cap with this sturdy aluminum one - LEYO - Audi Volkswagen Porsche

Replace the factory plastic cap with this sturdy aluminum one For vehicles up through the 2020 model year only

Brand:
LEYO - Corporate Logo
ES#:
4140299
Mfg#:
L102B
Ships on Sep 9, 2026
$89.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

More About Engine Covers & Accessories

Engine covers are more than styling statements. They keep moisture, road salt, and debris from damaging your engine, battery, and other underhood components. Engine covers also help protect hoses and wiring harnesses from rodents.

ECS Tuning is not affiliated with any automobile manufacturers.
Manufacturer names and/or part numbers are used only for identification purposes.

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