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Audi S4 Engine Emission Parts

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Billet Fuel Cap Cover - Clear Anodized

ES#3677062 - 022506ECS0101 - Billet Fuel Cap Cover - Clear Anodized - Upgrade your gas cap to our gorgeous CNC-machined aluminum cover. Easily installs over your existing cap! - ECS - Audi Volkswagen Porsche

Upgrade your gas cap to our gorgeous CNC-machined aluminum cover. Easily installs over your existing cap! 10X Entries Into Our F80 M3 Sweepstakes

Brand:
ECS - Corporate Logo
ES#:
3677062
Mfg#:
022506ECS0101
In Stock
ON SALE! SAVE 10%
$137.99

This product was last offered at the strikethrough price on
06-13-2026

$124.19 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Gas Cap

ES#4845970 - 8K0201550N - Gas Cap - Includes seal and retaining strap - Bremmen Parts - Audi

Includes seal and retaining strap 10X Entries Into Our F80 M3 Sweepstakes

Brand:
Bremmen Parts - Corporate Logo
ES#:
4845970
Mfg#:
8K0201550N
In Stock
ON SALE! SAVE 19%
$31.99

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

$25.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Oil Separator/Pressure Control Valve (PCV)

ES#4623255 - 06E103547AB - Oil Separator/Pressure Control Valve (PCV) - Located beneath the supercharger compressor - URO - Audi

Located beneath the supercharger compressor 2X Entries Into Our F80 M3 Sweepstakes
We Price Match - Give Us A Call or Chat!
Fits from the 2013 model year

Brand:
URO - Corporate Logo
ES#:
4623255
Mfg#:
06E103547AB
In Stock
ON SALE!
$127.99

This product was last offered at the strikethrough price on
07-12-2026

$121.59 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Secondary Air Injection Pump

ES#4742865 - 079959231L - Secondary Air Injection Pump - Keep your engine running efficiently - URO - Audi

Keep your engine running efficiently 2X Entries Into Our F80 M3 Sweepstakes
We Price Match - Give Us A Call or Chat!
Up to the 2012 model year

Brand:
URO - Corporate Logo
ES#:
4742865
Mfg#:
079959231L
In Stock
$329.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Vent tube

ES#280572 - 06E103213 - Vent tube - Sits on top of the oil separator/pcv assembly - Genuine Volkswagen Audi - Audi

Sits on top of the oil separator/pcv assembly

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
280572
Mfg#:
06E103213
In Stock
15% off MSRP

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

$13.18

This product was last offered at the strikethrough price on
08-03-2026

$11.19 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Rear Oxygen Sensor - Priced Each

ES#4069386 - 06E906265Q - Rear Oxygen Sensor - Priced Each - Fits left and right side - Bosch - Audi

Fits left and right side We Price Match - Give Us A Call or Chat!

Brand:
Bosch - Corporate Logo
ES#:
4069386
Mfg#:
06E906265Q
In Stock
ON SALE!
$192.18

This product was last offered at the strikethrough price on
08-26-2026

$177.77 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Mishimoto Oil Catch Can Kit

ES#4141537 - MMBCCS418PBE - Mishimoto Oil Catch Can Kit - Give the 3.0T TFSI powering your 2018+ Audi S4 or S5 the extra layer of defense that it needs - Mishimoto - Audi

Give the 3.0T TFSI powering your 2018+ Audi S4 or S5 the extra layer of defense that it needs

Brand:
Mishimoto - Corporate Logo
ES#:
4141537
Mfg#:
MMBCCS418PBE
Ships in 3 Business Days
$445.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Oxygen Sensor Tool - Angled Handle - 7/8" - Bavarian Autosport

ES#3673911 - B8800066 - Oxygen Sensor Tool - Angled Handle - 7/8" - Bavarian Autosport - Slotted, pivoting head has both hexagon and double hexagon drive. Angled handle reaches around obstructions. - Bav Auto Tools - Audi BMW Volkswagen Mercedes Benz MINI Porsche
ECS Tuning recommends this product.

Slotted, pivoting head has both hexagon and double hexagon drive. Angled handle reaches around obstructions. 10X Entries Into Our F80 M3 Sweepstakes

Brand:
Bav Auto Tools - Corporate Logo
ES#:
3673911
Mfg#:
B8800066
Ships on Sep 30, 2026
Auto Notify
ON SALE! SAVE 25%
$49.99

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

$37.49 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Vacuum System Repair Kit

ES#2515457 - 51731257971KT - Vacuum System Repair Kit - Kit includes vacuum T fittings, vacuum line, and one way check valve - Assembled By ECS - Audi Volkswagen

Kit includes vacuum T fittings, vacuum line, and one way check valve 10X Entries Into Our F80 M3 Sweepstakes

Brand:
Assembled By ECS - Corporate Logo
ES#:
2515457
Mfg#:
51731257971KT
In Stock
ON SALE!
$47.99

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

$46.58 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Pressure Control Valve (PCV) Assembly

ES#3130041 - 078103235R - Pressure Control Valve (PCV) Assembly - Complete breather hose assembly that includes the PCV valve - Vaico - Audi

Complete breather hose assembly that includes the PCV valve We Price Match - Give Us A Call or Chat!
Manual & automatic transmission vehicles from VIN 8D-1-053001, split is in the 2001 model year

Brand:
Vaico - Corporate Logo
ES#:
3130041
Mfg#:
078103235R
In Stock
$409.99

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

$226.27 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Billet PCV Check Valve

ES#2864536 - 034-101-2002 - Billet PCV Check Valve - Located under the intake manifold - 034Motorsport - Audi Volkswagen

Located under the intake manifold 2X Entries Into Our F80 M3 Sweepstakes

Brand:
034Motorsport - Corporate Logo
ES#:
2864536
Mfg#:
034-101-2002
In Stock
ON SALE! SAVE 10%
$51.00

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

$45.90 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Oxygen Sensor - Priced Each

ES#2435 - 1K0998262AB - Oxygen Sensor - Priced Each - Keep your engine running efficiently - Bosch - Audi Volkswagen

Keep your engine running efficiently We Price Match - Give Us A Call or Chat!
Fits left and right rear position

Brand:
Bosch - Corporate Logo
ES#:
2435
Mfg#:
1K0998262AB
Ships in 1 Business Day
$148.99

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

$136.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Connecting Pipe

ES#280855 - 06E131143AK - Connecting Pipe - Connects the two combi valves together - Genuine Volkswagen Audi - Audi

Connects the two combi valves together Fits up to the 2012 model year (pre-facelift)

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
280855
Mfg#:
06E131143AK
Ships in 1-2 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.

$220.00

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

$204.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Pressure Control Valve (PCV) - (19mm)

ES#2804355 - 034129101BKT1 - Pressure Control Valve (PCV) - (19mm) - Located on the turbo inlet pipe. Includes hose clamps - Assembled By ECS - Audi Volkswagen

Located on the turbo inlet pipe. Includes hose clamps 10X Entries Into Our F80 M3 Sweepstakes

Brand:
Assembled By ECS - Corporate Logo
ES#:
2804355
Mfg#:
034129101BKT1
In Stock
ON SALE! SAVE 18%
$38.99

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

$31.98 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Vacuum System Repair Kit

ES#279586 - 06A198011B - Vacuum System Repair Kit - Restore engine performance with this new kit - Genuine Volkswagen Audi - Audi Volkswagen

Restore engine performance with this new kit

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
279586
Mfg#:
06A198011B
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.

$178.32

This product was last offered at the strikethrough price on
09-06-2026

$148.36 USD
Free Shipping

Front Oxygen Sensor - Priced Each

ES#4135675 - 06E906265AJ - Front Oxygen Sensor - Priced Each - Keep your engine running efficiently - Bosch - Audi

Keep your engine running efficiently We Price Match - Give Us A Call or Chat!
Fits the left and right position

Brand:
Bosch - Corporate Logo
ES#:
4135675
Mfg#:
06E906265AJ
In Stock
ON SALE! SAVE 36%
$369.20

This product was last offered at the strikethrough price on
08-19-2026

$236.99 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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