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Audi A4 Engine Emission Parts

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Secondary Air Injection Hose - Outlet

ES#2918547 - 058133817D - Secondary Air Injection Hose - Outlet - Connects the secondary air pump to the metal pipe - Vaico Q+ - Audi Volkswagen

Connects the secondary air pump to the metal pipe Engine codes ATW & AWM

Brand:
Vaico Q+ - Corporate Logo
ES#:
2918547
Mfg#:
058133817D
Ships in 1-2 days
$55.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Vent Hose

ES#3691233 - 8E0133781E - Vent Hose - Hose that comes off of the purge valve near your intake - URO - Audi

Hose that comes off of the purge valve near your intake 2X Entries For Our 25th Anniversary Sweepstakes!
We Price Match - Give Us A Call or Chat!

Brand:
URO - Corporate Logo
ES#:
3691233
Mfg#:
8E0133781E
Ships in 1 Business Day
$27.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Emissions Service Kit

ES#3426645 - 06F129101PKT2 - Emissions Service Kit - Everything you need to service your PCV system - Hamburg Tech - Audi

Everything you need to service your PCV system We Price Match - Give Us A Call or Chat!

Brand:
Hamburg Tech - Corporate Logo
ES#:
3426645
Mfg#:
06F129101PKT2
Ships in 1 Business Day
$109.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Catch Can Mounting Bracket (straight)

ES#3479288 - IEDIYUU1-7 - Catch Can Mounting Bracket (straight) - To make your custom install as easy as possible, IE offers stainless steel catch can mounting brackets - Integrated Engineering - Audi Volkswagen

To make your custom install as easy as possible, IE offers stainless steel catch can mounting brackets 5X Entries For Our 25th Anniversary Sweepstakes!

Brand:
Integrated Engineering - Corporate Logo
ES#:
3479288
Mfg#:
IEDIYUU1-7
Back Ordered
Auto Notify
$9.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Breather Hose

ES#2807108 - 06B103217S - Breather Hose - Connects the PCV to the bleeder valve - Kayser - Audi

Connects the PCV to the bleeder valve From VIN 8E-4-000001, split is in the 2004 model year

Brand:
Kayser - Corporate Logo
ES#:
2807108
Mfg#:
06B103217S
Ships in 1-2 days
$107.53 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Oxygen Sensor - 4 Pin - Black

Located after the catalytic converter For models with BGN engine code only - Fits left and right sides

Brand:
Walker - Corporate Logo
ES#:
3690282
Mfg#:
1K0998262R
Ships in 1-2 days
$106.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Breather Hose Connector

ES#2710724 - 06B103221P - Breather Hose Connector - Connects the valve cover to the vent tubes - Vaico - Audi Volkswagen

Connects the valve cover to the vent tubes We Price Match - Give Us A Call or Chat!
Engine code AWM

Brand:
Vaico - Corporate Logo
ES#:
2710724
Mfg#:
06B103221P
In Stock
ON SALE!
$15.99

This product was last offered at the strikethrough price on
06-25-2026

$15.19 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Gas Cap

ES#2187546 - 1H0201553B - Gas Cap - Keep your fuel system sealed - URO - Audi Volkswagen

Keep your fuel system sealed 2X Entries For Our 25th Anniversary Sweepstakes!
We Price Match - Give Us A Call or Chat!
Up to VIN 8D-W-070001, split is in the 1998 model year

Brand:
URO - Corporate Logo
ES#:
2187546
Mfg#:
1H0201553B
Ships in 1 Business Day
ON SALE!
$10.15

This product was last offered at the strikethrough price on
06-25-2026

$9.64 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Crankcase Ventilation Tube

ES#259526 - 06B103213AK - Crankcase Ventilation Tube - Connects the hose connector to the 3 way valve housing - Genuine Volkswagen Audi - Audi

Connects the hose connector to the 3 way valve housing From the 2004 model year

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
259526
Mfg#:
06B103213AK
Ships in 3 Business Days
1% off MSRP

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

$106.67

This product was last offered at the strikethrough price on
07-25-2026

$105.09 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Retaining Spring - Priced Each

ES#4871901 - 037121142A - Retaining Spring - Priced Each - Keep your lines and hoses secure - Bremmen Parts - Audi Volkswagen

Keep your lines and hoses secure 10X Entries For Our 25th Anniversary Sweepstakes!

Used to retain vent hose on crankcase breather assembly

Brand:
Bremmen Parts - Corporate Logo
ES#:
4871901
Mfg#:
037121142A
In Stock
ON SALE! SAVE 37%
$7.99

This product was last offered at the strikethrough price on
05-29-2026

$5.00 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Three-Way Valve Housing

ES#258895 - 06A103247 - Three-Way Valve Housing - 'T' shaped connection below the intake manifold - Genuine Volkswagen Audi - Audi Volkswagen

'T' shaped connection below the intake manifold

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
258895
Mfg#:
06A103247
Ships in 2 Business 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.

$22.99

This product was last offered at the strikethrough price on
07-25-2026

$20.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Combi Valve Inlet Hose

ES#4615941 - 06B133784R - Combi Valve Inlet Hose - Connects combi valve to air pump hose - URO - Audi Volkswagen

Connects combi valve to air pump hose 2X Entries For Our 25th Anniversary Sweepstakes!
We Price Match - Give Us A Call or Chat!

Brand:
URO - Corporate Logo
ES#:
4615941
Mfg#:
06B133784R
Ships in 1 Business Day
$26.00 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Front Oxygen Sensor - Priced Each

Keep your engine running efficiently 10X Entries For Our 25th Anniversary Sweepstakes!

Brand:
Bremmen Parts - Corporate Logo
ES#:
5470646
Mfg#:
1K0998262L
Ships on Dec 4, 2026
Auto Notify
ON SALE! SAVE 20%
$129.99

This product was last offered at the strikethrough price on
05-29-2026

$103.99 USD
This product is lifetime replacement eligible Lifetime Replacement

Vacuum Tank

ES#357507 - 443131541 - Vacuum Tank - Holds vacuum pressure - Genuine Volkswagen Audi - Audi Volkswagen

Holds vacuum pressure

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
357507
Mfg#:
443131541
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.

$56.99

This product was last offered at the strikethrough price on
07-25-2026

$51.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Clamp - 33.5x10x0.8

ES#469992 - N90489801 - Clamp - 33.5x10x0.8 - Used to secure the PCV hose - Genuine Volkswagen Audi - Audi

Used to secure the PCV hose From VIN 8E-4-000001, split is in the 2004 model year

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
469992
Mfg#:
N90489801
In Stock
$1.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Crankcase Breather Hose

ES#263051 - 078103223B - Crankcase Breather Hose - Small "S" breather hose that runs on the backside of the intake manifold - Genuine Volkswagen Audi - Audi Volkswagen

Small "S" breather hose that runs on the backside of the intake manifold

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
263051
Mfg#:
078103223B
Ships in 2 Business Days
6% off MSRP

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

$109.99

This product was last offered at the strikethrough price on
07-25-2026

$102.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

More About Engine Emission Parts

Repairing failed emission components doesn't just turn off the check engine light so you can pass your local emissions test, it also improves performance and fuel economy. ECS stocks all common emission controls, from oxygen sensors to PCV valves.

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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