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Audi A4 Engine Parts & Accessories

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Diverter Valve

ES#4066582 - 06H145710D - Diverter Valve - Superior piston style diverter valve - Hamburg Tech - Audi Volkswagen

Superior piston style diverter valve We Price Match - Give Us A Call or Chat!

Brand:
Hamburg Tech - Corporate Logo
ES#:
4066582
Mfg#:
06H145710D
Ships in 5 Business Days
$55.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Brake Reservoir Cap

ES#4716596 - 5Q0611349E - Brake Reservoir Cap - Clean up your engine bay with a new cap - Genuine Volkswagen Audi - Audi Volkswagen

Clean up your engine bay with a new cap

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
4716596
Mfg#:
5Q0611349E
In Stock
13% off MSRP

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

$15.99

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

$13.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Radiator

ES#2901824 - 8K0121251T - Radiator - Keep your cooling system operating properly - Vemo - Audi

Keep your cooling system operating properly Automatic transmission vehicles only

Brand:
Vemo - Corporate Logo
ES#:
2901824
Mfg#:
8K0121251T
Ships in 2 Business Days
$402.99

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

$390.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Voltage Regulator

ES#280125 - 06B903803B - Voltage Regulator - Located on the rear of the alternator - Genuine Volkswagen Audi - Audi Volkswagen

Located on the rear of the alternator For 90 amp alternators from VIN 8D-X-200001, split is in the 1999 model year

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
280125
Mfg#:
06B903803B
Ships in 6 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.

$420.99

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

$390.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Timing Belt Kit - Standard

ES#45 - 078198479kt - Timing Belt Kit - Standard - Includes the basic components to service your timing belt - Assembled By ECS - Audi Volkswagen

Includes the basic components to service your timing belt 10X Entries Into Our F80 M3 Sweepstakes

Brand:
Assembled By ECS - Corporate Logo
ES#:
45
Mfg#:
078198479KT
Ships in 9 Business Days
ON SALE! SAVE 12%
$110.99

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

$97.72 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

ECS Tuning Timing Belt Kit - Ultimate Plus

ES#6198 - 078198479 V2+ - ECS Tuning Timing Belt Kit - Ultimate Plus - The most comprehensive timing belt kit on the market! - Assembled By ECS - Audi Volkswagen

The most comprehensive timing belt kit on the market! 10X Entries Into Our F80 M3 Sweepstakes
From VIN 8D-W-007799, split is in the 1998 model year

Brand:
Assembled By ECS - Corporate Logo
ES#:
6198
Mfg#:
078198479 V2+
Ships in 9 Business Days
ON SALE!
$392.99

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

$390.69 USD
Free Shipping
This product is lifetime replacement eligible Partial Replacement

Valve Stem Seal - Priced Each

ES#274317 - 036109675A - Valve Stem Seal - Priced Each - Seals the valve stem in the cylinder head. 6mm - Genuine Volkswagen Audi - Audi Volkswagen

Seals the valve stem in the cylinder head. 6mm

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
274317
Mfg#:
036109675A
In Stock
3% off MSRP

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

$23.78

This product was last offered at the strikethrough price on
10-04-2026

$22.98 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Thrust Washer Set

ES#4858526 - 034-202-1015 - Thrust Washer Set - A recommended "while you're in there" purchase when replacing main bearings. - 034Motorsport - Audi

A recommended "while you're in there" purchase when replacing main bearings. 2X Entries Into Our F80 M3 Sweepstakes

Brand:
034Motorsport - Corporate Logo
ES#:
4858526
Mfg#:
034-202-1015
In Stock
$65.00 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Stainless Steel Coil Cover - Raw

ES#3236028 - 034-107-Z018-R - Stainless Steel Coil Cover - Raw - Precision stamped and bent 304 Stainless coil cover with hardware - 034Motorsport - Audi Volkswagen

Precision stamped and bent 304 Stainless coil cover with hardware 2X Entries Into Our F80 M3 Sweepstakes

Brand:
034Motorsport - Corporate Logo
ES#:
3236028
Mfg#:
034-107-Z018-R
Ships on Oct 21, 2026
$65.00 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Alternator - 150amp

ES#2725353 - 06B903016QX - Alternator - 150amp - New alternator with no core charge - Valeo - Audi

New alternator with no core charge We Price Match - Give Us A Call or Chat!

Brand:
Valeo - Corporate Logo
ES#:
2725353
Mfg#:
06B903016QX
Ships on Oct 26, 2026
$389.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Diverter Valve - Polished

ES#2917784 - DV25 - Diverter Valve - Polished - Keep your turbo boosting like it should - Euro Sport Acc - Audi Volkswagen

Keep your turbo boosting like it should

Brand:
Euro Sport Acc - Corporate Logo
ES#:
2917784
Mfg#:
DV25
Ships in 4 Business Days
$129.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Coolant Expansion Tank

ES#2535175 - 8D0121403L - Coolant Expansion Tank - Clean up your engine bay or replaced your cracked unit with a new coolant expansion tank - URO - Audi Volkswagen

Clean up your engine bay or replaced your cracked unit with a new coolant expansion tank 2X Entries Into Our F80 M3 Sweepstakes
We Price Match - Give Us A Call or Chat!
Fits vehicles from VIN# 8D-W-007 800, Split is in model year 1998

Brand:
URO - Corporate Logo
ES#:
2535175
Mfg#:
8D0121403L
In Stock
$25.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

RacingLine Billet Coolant Outlet - EA888.3 / EA888.4

ES#5386705 - VWR140014 - RacingLine Billet Coolant Outlet - EA888.3 / EA888.4 - The ultimate long-term fix for the brittle plastic factory part. - Racingline - Audi Volkswagen

The ultimate long-term fix for the brittle plastic factory part.

Brand:
Racingline - Corporate Logo
ES#:
5386705
Mfg#:
VWR140014
Back Ordered
ON SALE! SAVE 11%
$39.99

This product was last offered at the strikethrough price on
09-18-2026

$35.41 USD
Free Shipping
on orders $49 and up

Coolant Pipe O-Ring - Priced Each

ES#471191 - N90925001 - Coolant Pipe O-Ring - Priced Each - Provides seal from metal to plastic cooling line end fitting. 17x3 - Genuine Volkswagen Audi - Audi

Provides seal from metal to plastic cooling line end fitting. 17x3

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
471191
Mfg#:
N90925001
In Stock
17% off MSRP

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

$5.99

This product was last offered at the strikethrough price on
10-04-2026

$4.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Stage 1

Average gain of 45 horsepower and 60 lb-ft of torque on 91 Octane @ 16 PSI For vehicles with AEB engine code from the 2000 model year only

Brand:
Tunezilla - Corporate Logo
ES#:
3097321
Mfg#:
18T-20V-150-1
Ships in 8 Business Days
$389.00 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Stage 1

Average gain of 38 horsepower and 69 lb-ft of torque on 91 Octane @ 18 PSI For vehicles with ATW & AWM engine codes only

Brand:
Tunezilla - Corporate Logo
ES#:
3097325
Mfg#:
18T-20V-170-1
Ships in 8 Business Days
$389.00 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

More About Engine Parts & Accessories

Whether you're maintaining or repairing your stock engine or looking for added horsepower, we have one of the most comprehensive inventories of engine parts and accessories for German cars. From hard engine parts like connecting rods, pistons, cylinder heads, short blocks, and engine timing parts to performance engine software upgrades; we have you covered.

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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