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Volkswagen MK4 Engine Emission Parts

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Air Pump Hose

ES#3450037 - 06A131127M - Air Pump Hose - Hose that runs from the secondary air pump to the Combi Valve - Kayser - Volkswagen

Hose that runs from the secondary air pump to the Combi Valve affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
For vehicles with an AZG, AVH, BBW, or BEV engine code only

Brand:
Kayser - Corporate Logo
ES#:
3450037
Mfg#:
06A131127M
In Stock
$35.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Combi Valve

ES#2739688 - 06A131351D - Combi Valve - Also known as the Secondary Air Injection Valve - Pierburg - Volkswagen

Also known as the Secondary Air Injection Valve affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
For vehicles with an AZG, AVH, BBW, or BEV engine code only

Brand:
Pierburg - Corporate Logo
ES#:
2739688
Mfg#:
06A131351D
Ships in 1-2 days
$106.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Oxygen Sensor - 4 Pin - Black

Located after the catalytic converter affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
Fits the right side

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

Vacuum Check Valve - Priced Each

ES#276312 - 046905291A - Vacuum Check Valve - Priced Each - In line vacuum one way valve to ensure proper air suction - Genuine Volkswagen Audi - Volkswagen

In line vacuum one way valve to ensure proper air suction affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
276312
Mfg#:
046905291A
Ships in 1-2 days
10% 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
06-06-2026

$52.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Air Pump Hose

ES#279366 - 06A131127M - Air Pump Hose - Hose that runs from the secondary air pump to the Combi Valve - Genuine Volkswagen Audi - Volkswagen

Hose that runs from the secondary air pump to the Combi Valve affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
For vehicles with an AZG, AVH, BBW, or BEV engine code only

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
279366
Mfg#:
06A131127M
Special Order: No Guaranteed ETA
6% off MSRP

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

$111.99

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

$104.99 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 affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms 10X Entries For Our 25th Anniversary Sweepstakes!

Brand:
Bremmen Parts - Corporate Logo
ES#:
4871901
Mfg#:
037121142A
Ships on Aug 10, 2026
Auto Notify
ON SALE! SAVE 29%
$7.99

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

$5.70 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Breather Hose

ES#2550151 - 06A103221BH - Breather Hose - 3-way breather hose that sits on top of the valve cover - Vaico - Audi Volkswagen

3-way breather hose that sits on top of the valve cover affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
We Price Match - Give Us A Call or Chat!

Brand:
Vaico - Corporate Logo
ES#:
2550151
Mfg#:
06A103221BH
In Stock at Vendor
$34.99

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

$33.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Connecting Pipe

ES#3234780 - 06A133817Q - Connecting Pipe - Small pipe that is attached to combi valve and connecting pipe to the air pump - Gates - Audi Volkswagen

Small pipe that is attached to combi valve and connecting pipe to the air pump affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

Brand:
Gates - Corporate Logo
ES#:
3234780
Mfg#:
06A133817Q
Ships on Jun 25, 2026
$96.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Breather Valve (PCV)

ES#2812913 - 035103245G - Breather Valve (PCV) - Stepped plastic valves that resides under intake manifold & attached to the engine block breather system - Hamburg Tech - Audi Volkswagen

Stepped plastic valves that resides under intake manifold & attached to the engine block breather system affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
We Price Match - Give Us A Call or Chat!
For vehicles with AWP engine code, with production date up to 6/30/2003

Brand:
Hamburg Tech - Corporate Logo
ES#:
2812913
Mfg#:
035103245G
In Stock
$15.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Shut-Off Valve

ES#4985 - 06A131102F - Shut-Off Valve - Also known as the 'combi valve' - Pierburg - Audi Volkswagen

Also known as the 'combi valve' affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

Brand:
Pierburg - Corporate Logo
ES#:
4985
Mfg#:
06A131102F
Special Order: No Guaranteed ETA
$94.85 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Intake Pipe

ES#307367 - 1J0131128AB - Intake Pipe - Pipe from check valve to secondary air pump - Genuine Volkswagen Audi - Volkswagen

Pipe from check valve to secondary air pump affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
307367
Mfg#:
1J0131128AB
Ships in 8 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.

$96.99

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

$90.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Universal Oxygen Sensor Bung - Priced Each

ES#5051 - ATP-FLS-022 - Universal Oxygen Sensor Bung - Priced Each - Stainless steel weld-in nut for any O2 sensor - ATP - Audi BMW Volkswagen

Stainless steel weld-in nut for any O2 sensor affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

Brand:
ATP - Corporate Logo
ES#:
5051
Mfg#:
ATP-FLS-022
Ships in 6 Business Days
$12.95 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

PCV Breather Hose

ES#4138709 - 06A103221BM - PCV Breather Hose - "S" shaped hose for crankcase ventilation system - URO - Volkswagen

"S" shaped hose for crankcase ventilation system affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
We Price Match - Give Us A Call or Chat!
For vehicles with AWP engine code with VIN from 1J-54013 539 only, split is in the 2005 model year

Brand:
URO - Corporate Logo
ES#:
4138709
Mfg#:
06A103221BM
In Stock
$29.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Oxygen Sensor - Priced Each

ES#2598388 - 06A906262Q - Oxygen Sensor - Priced Each - Keep your engine running efficiently, restore MPG, and clear check engine lights - Vemo - 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
For vehicles with AWD engine code only

Brand:
Vemo - Corporate Logo
ES#:
2598388
Mfg#:
06A906262Q
Special Order: No Guaranteed ETA
$144.99

This product was last offered at the strikethrough price on
03-19-2026

$88.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Combi Valve

ES#3604903 - 06A131351H - Combi Valve - Also known as the Secondary Air Injection Valve - Pierburg - Volkswagen

Also known as the Secondary Air Injection Valve affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
For vehicles with AEG engine code only

Brand:
Pierburg - Corporate Logo
ES#:
3604903
Mfg#:
06A131351H
Ships in 1-2 days
$88.73 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Breather/Air Hose

ES#2681775 - 06A103493BD - Breather/Air Hose - 90 degree breather/air hose that attaches to valve cover - URO - Audi Volkswagen

90 degree breather/air hose that attaches to valve cover affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
We Price Match - Give Us A Call or Chat!

Brand:
URO - Corporate Logo
ES#:
2681775
Mfg#:
06A103493BD
Ships in 1 Business Day
$21.99 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 Volkswagen

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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