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Audi A4 Engine Emission Parts

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Gas Cap

ES#3235747 - 4F0201550B - Gas Cap - Replace your leaking cap, or the one you left at the pump - Gates - Audi

Replace your leaking cap, or the one you left at the pump Earn 5% back in ECS Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply
For sedan/avant models only

Brand:
Gates - Corporate Logo
ES#:
3235747
Mfg#:
4F0201550B
Ships in 4 Business Days
$27.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Oil Separator/PCV Valve

ES#5492241 - 06K103495BL - Oil Separator/PCV Valve - Direct OE replacement crankcase breather to cure rough idle, oil consumption, and whistling noises on your 1.8T or 2.0T EA888 Gen3. - Febi - Audi Volkswagen

Direct OE replacement crankcase breather to cure rough idle, oil consumption, and whistling noises on your 1.8T or 2.0T EA888 Gen3. Earn 5% back in ECS Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply
For vehicles with CYMC engine code only

Brand:
Febi - Corporate Logo
ES#:
5492241
Mfg#:
06K103495BL
Ships on Jan 11, 2027
$54.99 USD
Free Shipping
on orders $49 and up

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 Into Our F80 M3 Sweepstakes Earn 5% back in ECS Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply
We Price Match - Give Us A Call or Chat!

Brand:
URO - Corporate Logo
ES#:
4615941
Mfg#:
06B133784R
Ships in 2 Business Days
$26.00 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Elbow Connector

ES#4874 - 079133784J - Elbow Connector - Connects the suction pump to the intake manifold - Genuine Volkswagen Audi - Audi Volkswagen

Connects the suction pump to the intake manifold Earn 5% back in ECS Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
4874
Mfg#:
079133784J
Ships in 3 Business Days
7% off MSRP

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

$55.99

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

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

Crankcase Breather Hose

ES#2575555 - 06A103213F - Crankcase Breather Hose - Connects the oil filter adapter to the three-way valve housing - Hamburg Tech - Audi Volkswagen

Connects the oil filter adapter to the three-way valve housing Earn 5% back in ECS Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply
We Price Match - Give Us A Call or Chat!
Engine code AWM

Brand:
Hamburg Tech - Corporate Logo
ES#:
2575555
Mfg#:
06A103213F
In Stock
$12.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Secondary Air Injection Hose - Inlet

ES#3462915 - 058133817H - Secondary Air Injection Hose - Inlet - Connects the secondary air pump to the air box - Kayser - Audi Volkswagen

Connects the secondary air pump to the air box Earn 5% back in ECS Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply
Engine codes ATW & AWM

Brand:
Kayser - Corporate Logo
ES#:
3462915
Mfg#:
058133817H
Ships in 6 Business Days
$51.99

This product was last offered at the strikethrough price on
05-07-2026

$50.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Breather Hose from PRV (Pressure Regulating Valve)

ES#2878555 - 06B103493M - Breather Hose from PRV (Pressure Regulating Valve) - Vaico - Audi Volkswagen

Earn 5% back in ECS Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply
We Price Match - Give Us A Call or Chat!
Up to VIN 84-4-000001, split is in the 2004 model year

Brand:
Vaico - Corporate Logo
ES#:
2878555
Mfg#:
06B103493M
Ships in 1-2 days
$25.99

This product was last offered at the strikethrough price on
05-07-2026

$16.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Check Valve - Priced Each

ES#3022 - 058905291K - Check Valve - Priced Each - Used in multiple locations in vacuum system - Genuine Volkswagen Audi - Audi Volkswagen

Used in multiple locations in vacuum system Earn 5% back in ECS Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
3022
Mfg#:
058905291K
Ships in 1-2 days
15% off MSRP

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

$58.99

This product was last offered at the strikethrough price on
10-05-2026

$49.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Vacuum Line

ES#280878 - 06E133633 - Vacuum Line - Located off the intake manifold connecting to the control line - Genuine Volkswagen Audi - Audi

Located off the intake manifold connecting to the control line Earn 5% back in ECS Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
280878
Mfg#:
06E133633
Ships in 1-2 days
14% off MSRP

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

$57.99

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

$49.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Air Pump Hose

ES#277667 - 058133785B - Air Pump Hose - Connects the metal pipes in the air pump system - Genuine Volkswagen Audi - Audi Volkswagen

Connects the metal pipes in the air pump system Earn 5% back in ECS Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
277667
Mfg#:
058133785B
Ships in 5 Business Days
7% off MSRP

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

$53.99

This product was last offered at the strikethrough price on
10-30-2026

$49.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Leak Detection Pump Hose

ES#440760 - 8E0906272C - Leak Detection Pump Hose - Connects the leak detection pump to the filter - Genuine Volkswagen Audi - Audi

Connects the leak detection pump to the filter Earn 5% back in ECS Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
440760
Mfg#:
8E0906272C
Ships on Nov 16, 2026
14% off MSRP

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

$57.99

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

$49.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Oil Separator Gasket

ES#281352 - 06H103517D - Oil Separator Gasket - Seal between the oil separator and the engine block - Genuine Volkswagen Audi - Audi

Seal between the oil separator and the engine block Earn 5% back in ECS Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
281352
Mfg#:
06H103517D
Ships in 1-2 days
17% off MSRP

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

$29.99

This product was last offered at the strikethrough price on
10-26-2026

$24.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Hose Clamp - Priced Each

ES#470651 - N90739901 - Hose Clamp - Priced Each - Install new clamps to stay leak free. 31x10x0.8mm - Genuine Volkswagen Audi - Audi Volkswagen

Install new clamps to stay leak free. 31x10x0.8mm Earn 5% back in ECS Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
470651
Mfg#:
N90739901
In Stock
$1.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Crankcase Breather Hose

ES#1306660 - 078103223B - Crankcase Breather Hose - Small "S" breather hose that runs on the backside of the intake manifold - Vaico - Audi Volkswagen

Small "S" breather hose that runs on the backside of the intake manifold Earn 5% back in ECS Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply
We Price Match - Give Us A Call or Chat!

Brand:
Vaico - Corporate Logo
ES#:
1306660
Mfg#:
078103223B
Ships in 2 Business Days
$48.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Vacuum Tank

ES#253076 - 038129807 - Vacuum Tank - Holds vacuum pressure - Genuine Volkswagen Audi - Audi Volkswagen

Holds vacuum pressure Earn 5% back in ECS Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply
Up to VIN 8E-3-100000, split is in the 2003 model year

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
253076
Mfg#:
038129807
Ships in 1-2 days
13% off MSRP

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

$55.99

This product was last offered at the strikethrough price on
10-05-2026

$48.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Elbow Hose

ES#279962 - 06B103493M - Elbow Hose - Connects the hard vent tube to the intake hose - Genuine Volkswagen Audi - Audi Volkswagen

Connects the hard vent tube to the intake hose Earn 5% back in ECS Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply
Up to VIN 84-4-000001, split is in the 2004 model year

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
279962
Mfg#:
06B103493M
Ships in 4 Business Days
14% 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
08-31-2026

$48.99 USD
Free Shipping
on orders $49 and up
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

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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