Emissions System for BMW 3 Series E46 (1999-2005)

Clear BMW chassis

Is your BMW throwing emissions related codes? While we're primarily a BMW performance parts house, we understand the importance of maintaining your emissions system to pass inspection in your area and keep your check engine light off. Pick up your emissions related parts from Turner Motorsport.

Sub-Categories

Sort By:

Bremmen "Cold Climate" Crankcase Pressure Regulator Valve Kit - BMW M...

10X Entries Into Our F80 M3 Sweepstakes 10X Entries For Our Spin To Win Sweepstakes!

T#:2528129

Part#: 11617533400S1

In Stock

Sale - Save 30% $ 112.99

This product was last offered at the strikethrough price on
11-07-2026

$ 79.09 USD

Add to Wish List

Qty

Sale - Save 30%

$ 112.99

This product was last offered at the strikethrough price on
11-07-2026

$ 79.09 USD

Add to Wish List

BMW has an ongoing issue with oil separators freezing in cold weather if driving is done before the vehicle is fully warmed up. There is often a howling noise followed by numerous oil leaks. The crankcase breather valve is used to purge the oil vapor from the engine block into the valve cover. However, sometimes condensation can cause it to freeze, causing the entire oil separator system to fail, crack, and disintegrate. Replace all the components of the oil separator system together to prevent damage to all the aspects of your engine. As long as you have everything off, you can rest assured that new parts will last and be reliable. Don't forget to order a valve cover gasket, throttle body gasket, and a new intake boot to make your separator change easier and more comprehensive.

Show More Show Less

Leak Detection Pump - Priced Each

For vehicles with production date from 09/2001

10X Entries Into Our F80 M3 Sweepstakes 10X Entries For Our Spin To Win Sweepstakes!

T#:35121140

Part#: 16137193479

In Stock

Sale - Save 25% $ 66.99

This product was last offered at the strikethrough price on
11-07-2026

$ 50.24 USD

Add to Wish List

Qty

Sale - Save 25%

$ 66.99

This product was last offered at the strikethrough price on
11-07-2026

$ 50.24 USD

Add to Wish List

Crankcase Vent Hose

10X Entries Into Our F80 M3 Sweepstakes 10X Entries For Our Spin To Win Sweepstakes!

T#:30629661

Part#: 11157831311

In Stock

Sale - Save 30% $ 31.99

This product was last offered at the strikethrough price on
11-07-2026

$ 22.39 USD

Add to Wish List

Qty

Sale - Save 30%

$ 31.99

This product was last offered at the strikethrough price on
11-07-2026

$ 22.39 USD

Add to Wish List

Radium Engineering Universal Catch Can Petcock Drain Kit

T#:27905095

Part#: 20-0024

In Stock at Vendor

$ 28.99 USD

Add to Wish List

Qty

$ 28.99 USD

Add to Wish List

Includes:

Anodized 4AN ORB Barbed Adapter Fitting, Black Ball Valve with 1/4" Barbs, 125psi @ 140F 4 feet of Radium 1/4" PCV Hose

Bremmen Crankcase Ventilation Hose - E39 E53 E60 E83 E46

10X Entries Into Our F80 M3 Sweepstakes 10X Entries For Our Spin To Win Sweepstakes!

T#:640147

Part#: 11611432559

In Stock

Sale - Save 30% $ 23.99

This product was last offered at the strikethrough price on
11-07-2026

$ 16.79 USD

Add to Wish List

Qty

Sale - Save 30%

$ 23.99

This product was last offered at the strikethrough price on
11-07-2026

$ 16.79 USD

Add to Wish List

Crankcase Vent Hose - From Valve Cover to Oil Separator - Fit BMWs with the M52 or M54 6 cylinder engine

Vacuum Control Valve

10X Entries Into Our F80 M3 Sweepstakes 10X Entries For Our Spin To Win Sweepstakes!

T#:47850818

Part#: 11747810831

In Stock

Sale - Save 30% $ 27.99

This product was last offered at the strikethrough price on
11-07-2026

$ 19.59 USD

Add to Wish List

Qty

Sale - Save 30%

$ 27.99

This product was last offered at the strikethrough price on
11-07-2026

$ 19.59 USD

Add to Wish List

Crankcase Ventilation Hose

10X Entries Into Our F80 M3 Sweepstakes 10X Entries For Our Spin To Win Sweepstakes!

T#:30629689

Part#: 11157532649

In Stock

Sale - Save 30% $ 15.99

This product was last offered at the strikethrough price on
11-07-2026

$ 11.19 USD

Add to Wish List

Qty

Sale - Save 30%

$ 15.99

This product was last offered at the strikethrough price on
11-07-2026

$ 11.19 USD

Add to Wish List

Oxygen Sensor - Front Or Rear Manifold

10X Entries Into Our F80 M3 Sweepstakes 10X Entries For Our Spin To Win Sweepstakes!

T#:56797107

Part#: 11787523434

Ships on Dec 15, 2026

Sale - Save 30% $ 119.99

This product was last offered at the strikethrough price on
11-07-2026

$ 83.99 USD

Add to Wish List

Qty

Sale - Save 30%

$ 119.99

This product was last offered at the strikethrough price on
11-07-2026

$ 83.99 USD

Add to Wish List

Meyle Oxygen Sensor - Post-Cat - E46 E39 X3 X5 Z3 Z4

For vehicles with production date up to 03/2003

5X Entries Into Our F80 M3 Sweepstakes 2X Entries For Our Spin To Win Sweepstakes!
We Price Match - Give Us A Call or Chat!

T#:5944219

Part#: 11781433940

Ships on Dec 4, 2026

$ 78.99 USD

Add to Wish List

Qty

$ 78.99 USD

Add to Wish List

This is the post-cat oxygen sensor for cylinders 4-6 for BMW E46 E39 X3 X5 Z3 Z4. This item fits the following BMWs: 1999-3/2003 E46 BMW 323i 323ci 325xi 328i 328ci 330i 330ci 330xi 2001-3/2003 E46 BMW 325i 325ci only for cars with M54 engine 1999-2003 E39 BMW 528i 525i 530i 2004-2006 E83 BMW X3 2.5 - Bank 1 Only 2004-2006 E83 BMW X3 3.0i - Bank 1 - Automatic Transmission Only 2000-2006 E53 BMW X5 3.0i 1999-2002 Z3 BMW Z3 2.3 Z3 2.5i Z3 2.8 Z3 3.0i 2003-2006 E85 BMW Z4 2.5i Z4 3.0i

Show More Show Less

02 SENSOR BUNG (WELD-ON TYPE) 304 STAINLESS STEEL (M18x1.5mm) ...

10X Entries Into Our F80 M3 Sweepstakes 10X Entries For Our Spin To Win Sweepstakes!

T#:47439371

Part#: 02SB1815

Ships on Jun 10, 2027

Sale - Save 46% $ 3.99

This product was last offered at the strikethrough price on
11-07-2026

$ 2.14 USD

Add to Wish List

Qty

Sale - Save 46%

$ 3.99

This product was last offered at the strikethrough price on
11-07-2026

$ 2.14 USD

Add to Wish List

Easily add an oxygen sensor to your custom exhaust setup with this universal O2 sensor bung. Designed for simple weld-on installation, it allows you to place your sensor exactly where you need it—perfect for custom builds, exhaust modifications, or performance tuning projects.

Features:

CNC-cut from T304 Stainless Steel for corrosion resistance
Threaded for M18x1.5mm RH oxygen sensors

Show More Show Less

Meyle Oxygen Sensor - Pre-Cat - E36 Z3 M44, E31, E38, E39 M62 (97-98)...

For vehicles with production date up to 03/2003

5X Entries Into Our F80 M3 Sweepstakes 2X Entries For Our Spin To Win Sweepstakes!
We Price Match - Give Us A Call or Chat!

T#:5944214

Part#: 11781247406

Back Ordered

$ 57.99 USD

Add to Wish List

Qty

$ 57.99 USD

Add to Wish List

This direct-fit Meyle oxygen sensor plugs directly into your factory connector. Fits M44 engine Z3 and 3 series and M62 engine E39, E38, E31 with V8 engines. No cutting or splicing is required. A new oxygen sensor can improve driveability and lengthen engine life. This is the pre-catalytic converter oxygen sensor

Show More Show Less

"Cold Climate" Crankcase Pressure Regulator Valve

5X Entries Into Our F80 M3 Sweepstakes 2X Entries For Our Spin To Win Sweepstakes!
We Price Match - Give Us A Call or Chat!

T#:35829339

Part#: 11617533400

Back Ordered

$ 69.99 USD

Add to Wish List

Qty

$ 69.99 USD

Add to Wish List

BMW vehicles are prone to oil separators freezing in cold weather if driven before the engine is fully warmed up. This can lead to a howling noise followed by multiple oil leaks. The crankcase breather valve vents oil vapor from the engine block to the valve cover, but condensation can sometimes cause it to freeze, leading to a failure of the entire oil separator system, causing it to crack and break down. To prevent damage to your engine, it’s best to replace all components of the oil separator system at once. Replacing everything ensures reliable performance and durability. Remember to also order a valve cover gasket to make the replacement process easier.

Project Cars

SELECT YOUR BMW

Emissions System for BMW 3 Series E46 (1999-2005)

Sub-Categories

Bremmen "Cold Climate" Crankcase Pressure Regulator Valve Kit - BMW M...

Leak Detection Pump - Priced Each

Crankcase Vent Hose

Radium Engineering Universal Catch Can Petcock Drain Kit

Bremmen Crankcase Ventilation Hose - E39 E53 E60 E83 E46

Vacuum Control Valve

Crankcase Ventilation Hose

Oxygen Sensor - Front Or Rear Manifold

Meyle Oxygen Sensor - Post-Cat - E46 E39 X3 X5 Z3 Z4

02 SENSOR BUNG (WELD-ON TYPE) 304 STAINLESS STEEL (M18x1.5mm) ...

Meyle Oxygen Sensor - Pre-Cat - E36 Z3 M44, E31, E38, E39 M62 (97-98)...

"Cold Climate" Crankcase Pressure Regulator Valve

Select Vehicle

Purpose

Category

Brand

Price

Special Offers

Shipping

Narrow Results