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Audi S4 Engine Electrical Parts

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Knock Sensor - Brown Connector - Priced Each

ES#3437888 - 078905377 - Knock Sensor - Brown Connector - Priced Each - Detects engine ping for timing adjustment - Facet - Audi

Detects engine ping for timing adjustment From VIN 8D-X-260001, split is in the 1999 model year

Brand:
Facet - Corporate Logo
ES#:
3437888
Mfg#:
078905377
In Stock at Vendor
$48.47

This product was last offered at the strikethrough price on
07-15-2026

$44.63 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Mass Air Flow Connector Housing - Female Connector

ES#9775 - 1j0973999a - Mass Air Flow Connector Housing - Female Connector - Contact housing for the MAF sensor - Genuine Volkswagen Audi - Audi Volkswagen

Contact housing for the MAF sensor

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
9775
Mfg#:
1J0973999A
Ships in 2 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.

$13.99

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

$12.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Fuel Pump Gasket

ES#2642184 - 1J0919133 - Fuel Pump Gasket - Located between the union nut and the fuel tank - Pierburg - Audi Volkswagen

Located between the union nut and the fuel tank

Brand:
Pierburg - Corporate Logo
ES#:
2642184
Mfg#:
1J0919133
In Stock
ON SALE! SAVE 33%
$11.99

This product was last offered at the strikethrough price on
07-09-2026

$8.08 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

THINKCAR CJS101 Compact Battery Analyzer

An all-in-one battery starter, DTC code reader, and alternator analyzer.

Brand:
THINKCAR - Corporate Logo
ES#:
4745613
Mfg#:
3.03.06.0001
Ships in 1 Business Day
$129.00 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Knock Sensor - Brown Connector - Priced Each

ES#3410515 - 078905377 - Knock Sensor - Brown Connector - Priced Each - Detects engine ping for timing adjustment - FAE - Audi

Detects engine ping for timing adjustment From VIN 8D-X-260001, split is in the 1999 model year

Brand:
FAE - Corporate Logo
ES#:
3410515
Mfg#:
078905377
Ships in 1-2 days
ON SALE! SAVE 12%
$48.99

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

$42.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

N205 Valve - Priced Each

ES#5444992 - 06E109257AC - N205 Valve - Priced Each - Valve that controls cam adjustment (Camshaft solenoid adjuster) - Bremmen Parts - Audi Volkswagen

Valve that controls cam adjustment (Camshaft solenoid adjuster) 10X Entries Into Our F80 M3 Sweepstakes

Brand:
Bremmen Parts - Corporate Logo
ES#:
5444992
Mfg#:
06E109257AC
In Stock
ON SALE! SAVE 20%
$79.99

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

$63.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Fuel Pump Seal

ES#4039425 - 4F0919133B - Fuel Pump Seal - Located between the union nut and the plastic ring - Vaico - Audi

Located between the union nut and the plastic ring We Price Match - Give Us A Call or Chat!

Brand:
Vaico - Corporate Logo
ES#:
4039425
Mfg#:
4F0919133B
Ships in 2 Business Days
$32.99

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

$31.99 USD
Free Shipping
on orders $49 and up

CTEK Battery Tester

Easy to use — simply attach to the battery (no need to disconnect) and follow the on-screen instructions

Brand:
CTEK - Corporate Logo
ES#:
4492954
Mfg#:
56-925
Back Ordered
$126.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Knock Sensor - Blue (390mm)

ES#285158 - 079905377H - Knock Sensor - Blue (390mm) - Keep your engine running smoothly - Genuine Volkswagen Audi - Audi

Keep your engine running smoothly Fits left rear only

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
285158
Mfg#:
079905377H
Ships in 7 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.

$137.99

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

$124.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

12v Digital Battery and System Tester

ES#2949738 - SOLBA9 - 12v Digital Battery and System Tester - Great tool for shop or home - Solar - Audi BMW Volkswagen Mercedes Benz MINI Porsche

Great tool for shop or home

Brand:
Solar - Corporate Logo
ES#:
2949738
Mfg#:
SOLBA9
Ships in 6 Business Days
$123.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

High Pressure Fuel Pump O-Ring

ES#3142384 - WHT005184 - High Pressure Fuel Pump O-Ring - Seals the high pressure fuel pump to the cylinder head - Victor Reinz - Audi Volkswagen

Seals the high pressure fuel pump to the cylinder head

Brand:
Victor Reinz - Corporate Logo
ES#:
3142384
Mfg#:
WHT005184
Ships in 1-2 days
$6.11

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

$5.09 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Green Knock Sensor With Harness - 465mm

ES#4135457 - 06E905376A - Green Knock Sensor With Harness - 465mm - Detects engine ping for timing adjustment, 465mm length with green connector - Holstein - Audi Volkswagen

Detects engine ping for timing adjustment, 465mm length with green connector For cylinders 1-3

Brand:
Holstein - Corporate Logo
ES#:
4135457
Mfg#:
06E905376A
Ships in 1 Business Day
$40.99

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

$39.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Spark Plugs - Set Of Six

ES#2580748 - 101000063AAKT2 - Spark Plugs - Set Of Six - Keep your engine running strong - Genuine Volkswagen Audi - Audi

Keep your engine running strong

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
2580748
Mfg#:
101000063AAKT2
In Stock
$119.94 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Coolant Temperature Sensor

ES#2972929 - 059919501AKT2 - Coolant Temperature Sensor - Revised green 4 pin sensor, located in the cooling flange located on the side of the cylinder head - Hamburg Tech - Audi Volkswagen

Revised green 4 pin sensor, located in the cooling flange located on the side of the cylinder head We Price Match - Give Us A Call or Chat!

Brand:
Hamburg Tech - Corporate Logo
ES#:
2972929
Mfg#:
059919501AKT2
In Stock
ON SALE! SAVE 20%
$14.99

This product was last offered at the strikethrough price on
09-03-2026

$11.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

CT5 Time To Go

Take control of your day.

Brand:
CTEK - Corporate Logo
ES#:
4492818
Mfg#:
40-255
In Stock at Vendor
$118.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Titanium 3.0T/2.9T Ignition Coil Hardware Kit - Set Of Six Red Titanium Washers

ES#4476331 - TI-M6X1X40-6RD - Titanium 3.0T/2.9T Ignition Coil Hardware Kit - Set Of Six Red Titanium Washers - Replace your pesky OEM ignition coil tiedown studs with these titanium bolts! - ECS - Audi

Replace your pesky OEM ignition coil tiedown studs with these titanium bolts! 10X Entries Into Our F80 M3 Sweepstakes

Brand:
ECS - Corporate Logo
ES#:
4476331
Mfg#:
TI-M6X1X40-6RD
Ships in 9 Business Days
Auto Notify
ON SALE! SAVE 10%
$65.99

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

$59.39 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

More About Engine Electrical Parts

With automotive electrical content growing yearly, it has never been more important to keep your charging and electrical system in top working condition. ECS Tuning stocks a huge and constantly growing inventory of electrical sensors, electric motors, and electronic actuators from original equipment and name-brand aftermarket suppliers.

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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