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Audi A4 Engine Emission Parts

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Keep your engine running efficiently affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
Fits the left and right position

Brand:
Facet - Corporate Logo
ES#:
4135683
Mfg#:
06E906265Q
In Stock at Vendor
$91.99

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

$88.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Keep your engine running efficiently affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

Brand:
Denso - Corporate Logo
ES#:
4057476
Mfg#:
1K0998262L
In Stock
ON SALE! SAVE 40%
$293.99

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

$177.01 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement
ES#2966839 - 034-104-2003 - Silicone Elbow Hose - Connects the hard vent tube to the intake hose - 034Motorsport - Audi

Connects the hard vent tube to the intake hose affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
From VIN 8E-4-000001, split is in the 2004 model year

Brand:
034Motorsport - Corporate Logo
ES#:
2966839
Mfg#:
034-104-2003
In Stock
$22.00 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement
ES#2602299 - 06F129101P -  Pressure Control Valve - Also called the "breather valve" or "oil separator" - Vaico - Audi Volkswagen

Also called the "breather valve" or "oil separator" affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
We Price Match - Give Us A Call or Chat!
From production date 12/17/2005

Brand:
Vaico - Corporate Logo
ES#:
2602299
Mfg#:
06F129101P
In Stock at Vendor
$92.99

This product was last offered at the strikethrough price on
02-22-2026

$87.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement
ES#279948 - 06B103213K - Breather Tube - Connects the hose connector to the PCV elbow - Genuine Volkswagen Audi - Audi Volkswagen

Connects the hose connector to the PCV elbow affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
Up to VIN 8E-3-040000, split is in the 2003 model year

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
279948
Mfg#:
06B103213K
Ships in 3 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.

$189.99

This product was last offered at the strikethrough price on
06-07-2026

$177.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Connects to the leak detection pump affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
450440
Mfg#:
8K0201997AH
Ships in 8 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.

$185.99

This product was last offered at the strikethrough price on
06-08-2026

$170.00 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement
ES#4818508 - 07C133529A - Vacuum Check Valve - Located near off of the intake manifold connecting to the suction pump - Bremmen Parts - Audi

Located near off of the intake manifold connecting to the suction pump affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms 10X Entries For Our 25th Anniversary Sweepstakes!

Brand:
Bremmen Parts - Corporate Logo
ES#:
4818508
Mfg#:
07C133529A
In Stock
ON SALE! SAVE 23%
$16.99

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

$13.05 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement
ES#3432392 - 034-101-3026 - Lower Block Breather Hose - designed to replace all of the crumbling plastic and rubber series of hoses making up the lower block breather - 034Motorsport - Audi

designed to replace all of the crumbling plastic and rubber series of hoses making up the lower block breather affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
Fits AEB & ATW engine codes only

Brand:
034Motorsport - Corporate Logo
ES#:
3432392
Mfg#:
034-101-3026
Ships in 2 Business Days
$169.00 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Delete your failure-prone PCV valve affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

Brand:
Forge - Corporate Logo
ES#:
3675326
Mfg#:
FMPCVD1
Ships in 3 Business Days
$168.37 USD
Free Shipping
on orders $49 and up
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 affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
Engine codes ATW & AWM

Brand:
Vaico Q+ - Corporate Logo
ES#:
2918547
Mfg#:
058133817D
Ships in 1 day
$55.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement
ES#3097721 - N1.50X051 - ECS Catch Can O-ring - Replacement ECS catch can O-ring - ECS - Audi BMW Volkswagen MINI

Replacement ECS catch can O-ring affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms 10X Entries For Our 25th Anniversary Sweepstakes!

Brand:
ECS - Corporate Logo
ES#:
3097721
Mfg#:
N1.50X051
In Stock
ON SALE! SAVE 25%
$5.99

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

$4.49 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement
ES#4883338 - 037906283C - Solenoid Valve - Priced Each - Common cure for DTC P0441 - Rein - Audi Volkswagen

Common cure for DTC P0441 affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
We Price Match - Give Us A Call or Chat!

Brand:
Rein - Corporate Logo
ES#:
4883338
Mfg#:
037906283C
Ships in 3 Business Days
$54.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement
ES#2613 - 078906265G - Oxygen Sensor - Priced Each  - Keep your engine running efficiently, restore MPG, and clear check engine lights - Bosch - Audi

Keep your engine running efficiently, restore MPG, and clear check engine lights affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
We Price Match - Give Us A Call or Chat!
For engine code AHA, fits right rear position

Brand:
Bosch - Corporate Logo
ES#:
2613
Mfg#:
078906265G
In Stock at Vendor
$164.49 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement
ES#3184090 - 06F129101PK -  Pressure Control Valve & Gasket Kit (PCV) - Also called the "breather valve" or "oil separator" - Includes gasket - MTC - Audi Volkswagen

Also called the "breather valve" or "oil separator" - Includes gasket affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
From production date 12/17/2005

Brand:
MTC - Corporate Logo
ES#:
3184090
Mfg#:
06F129101PK
Ships in 5 Business Days
$40.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement
ES#2866151 - 06A103213F - Crankcase Breather Tube - Connects the oil filter adapter to the three-way valve housing - Febi - Audi Volkswagen

Connects the oil filter adapter to the three-way valve housing affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
We Price Match - Give Us A Call or Chat!
Engine code AWM

Brand:
Febi - Corporate Logo
ES#:
2866151
Mfg#:
06A103213F
In Stock at Vendor
$26.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement
ES#2612 - 078906265F - Oxygen Sensor - Priced Each - Keep your engine running efficiently, restore MPG, and clear check engine lights - Bosch - Audi Volkswagen

Keep your engine running efficiently, restore MPG, and clear check engine lights affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
We Price Match - Give Us A Call or Chat!
Left rear position, behind catalyst

Brand:
Bosch - Corporate Logo
ES#:
2612
Mfg#:
078906265F
Ships in 1 day
$160.99 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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