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

Turner Universal Baffled Oil Catch Can Mounting Bracket Kit - BMW & M...

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T#:383333

Part#: 003779ECS06KT

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

$ 67.19 USD

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If you don't wish to fabricate intricate brackets to mount your ECS Baffled Oil Catch Can we have the solution. ECS's three-piece bracket kit includes two options for securing the catch can. Choose from either a flat parallel mounting plate or a bent 90° mounting plate to give you 360° rotation for an infinitely adjustable mounting location.

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Bav Auto Crankcase Pressure Regulator Valve - BMW M52 M54

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T#:640207

Part#: 11617501566

In Stock

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

$ 23.09 USD

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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 this and all the other components of the oil separator system 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. From 1974 to 2019, Bavarian Autosport was one of the premier vendors for BMW and MINI auto parts. We are happy to preserve the Bav Auto legacy by continuing to carry their high-quality products into the future. All Bav Auto parts will remain unchanged in design and sourced from the same OEM suppliers to ensure long-lasting reliability. We trust these parts, accessories, and upgrades so confidently that we back every Bavarian Autosport branded component with a 2-year warranty.

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Engine Oil Separator Package - Level 2 - E46 325, E39 525i M54 ...

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T#:24344785

Part#: M54OILSEPKT

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

$ 115.41 USD

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If you need to perform a complete oil separator system service, this Level 2 kit provides you with all of the main components necessary to service your engine oil separator system. This Level 2 kit includes the following: Oil Separator Hose from oil separator to dipstick tube Hose from oil separator to valve cover Hose from intake manifold back to the connector hose Hose from oil separator up to the intake manifold Throttle body gasket Throttle body inlet boot ICV rubber grommet Oil dipstick tube o-ring seal It is highly recommended to replace the oil dipstick tube with the updated design by BMW as this also a common place for sludge to build up.

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ECS Tuning Baffled Oil Catch Can - 8oz

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T#:13496655

Part#: 003779ECS05-02

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Sale - Save 10% $ 238.99

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

$ 215.09 USD

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$ 215.09 USD

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Upgrade Your BMW with ECS Baffled Oil Catch Can

Modern emission regulations require a closed PCV/Breather system for cleaner operation. However, inefficient oil particle capture can lead to excessive oil vapor ingestion, causing carbon buildup, reduced performance, and fuel economy. ECS Tuning's updated ECS Baffled Oil Catch Can, now with an easy-to-empty 1/4" drain fitting, is engineered to collect toxic blow-by gases, minimize carbon deposits, and reduce oil contamination within engine oil. Recirculating oil vapor ensures emissions compliance without venting to the atmosphere.

Key Features:
Highly Efficient Oil Separator: Strategically positioned 4 chamber baffle system maximizes oil/air separation and minimizes oil droplets in the intake tract.
Integrated Dipstick: Knurled and black anodized oil dipstick simplifies oil volume inspection.
Reservoir: Available in 6oz or 8oz capacity with a 1/4" NPT drain plug fitting.
Serviceable: Easily removable baffle plates and drain plug for cleaning.
Easy/Customizable Installation: Combine with the ECS Universal Bracket Kit for simplified installation and adjustable mounting locations.
Leak-Free Fittings: Machined -10AN ORB (O-Ring Boss) fittings available for secure connections (fittings sold separately).

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Electric Valve - For Secondary Air System Or Exhaust Flap

T#:362205

Part#: 11747810831

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$ 74.99

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

$ 42.19 USD

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This electric valve serves one of several purposes depending on which car it is used on. Please read the application listings below to ensure you are purchasing the correct part.

Pierburg pumps are some of the most trusted and widely used on the market. From fuel, water, air and vacuum Pierburg has you covered with OE quality and reliable performance year after year.

This item fits the following BMWs:
Secondary Air System Valve
1996-1998 E36 BMW 323is 323ic 328i 328is 328ic M3
1999-3/2003 E46 BMW 323i 323ci 325i 325ci 325xi 328i 328ci 330i 330ci 330xi
2003-2005 E46 BMW 325i 325ci (M56)
1997-2003 E39 BMW 525i 528i 530i
2000-2006 E53 BMW X5 3.0i
1997-2002 Z3 BMW Z3 2.3 Z3 2.5i Z3 2.8 Z3 3.0i
1997-2000 Z3 BMW M Roadster M Coupe (S52)

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Oil Separator Kit - Level 1

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T#:15710823

Part#: E46M5411_61KT

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

$ 74.97 USD

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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. 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. ur Level 1 kit includes the following; Oil separator Hose from oil separator to dipstick tube Hose from oil separator to valve cover Hose from intake manifold back to the connector hose Hose from oil separator up to the intake manifold

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Oil Separator Hose - E46, Z4

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T#:579880

Part#: 55080

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

$ 17.49 USD

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Cold climate version for extra insulation! Fits all E46 and Z4 chassis equipped with an M54 engine.

Bav Auto Crankcase Ventilation Return Hose - E46 E39 E60 Z3

For vehicles with production date from 01/2000

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T#:638072

Part#: 11617504536

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11-07-2026

$ 18.89 USD

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This is the BMW crankcase return line that goes from the intake manifold to the top CCV connecting hose. From 1974 to 2019, Bavarian Autosport was one of the premier vendors for BMW and MINI auto parts. We are happy to preserve the Bav Auto legacy by continuing to carry their high-quality products into the future. All Bav Auto parts will remain unchanged in design and sourced from the same OEM suppliers to ensure long-lasting reliability. We trust these parts, accessories, and upgrades so confidently that we back every Bavarian Autosport branded component with a 2-year warranty.

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Bav Auto Upper Oil Separator Vent Tube - E36 E46 E60 E84 Z3 Z4 M54 M5...

For vehicles with production date from 01/2000

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T#:640502

Part#: 11617504535

In Stock

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

$ 17.49 USD

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Runs from the top of the oil separator up to rear of the intake manifold. From 1974 to 2019, Bavarian Autosport was one of the premier vendors for BMW and MINI auto parts. We are happy to preserve the Bav Auto legacy by continuing to carry their high-quality products into the future. All Bav Auto parts will remain unchanged in design and sourced from the same OEM suppliers to ensure long-lasting reliability. We trust these parts, accessories, and upgrades so confidently that we back every Bavarian Autosport branded component with a 2-year warranty.

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Stainless Steel Oxygen Sensor (O2) Weld Bung (M18x1.5mm) - Priced Eac...

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T#:637408

Part#: 028092ECS11AKT

Ships on Jan 11, 2027

Sale - Save 30% $ 3.99

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

$ 2.79 USD

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Upgrade your exhaust system with the Stainless Steel Oxygen Sensor (O2) Weld Bung (M18x1.5mm). This high-quality weld bung is made from stainless steel, ensuring durability and resistance to corrosion. It features M18x1.5mm threads, making it compatible with most oxygen sensors. Perfect for custom exhaust setups or replacing damaged bungs, this weld bung is a must-have for any automotive enthusiast.

Made from high-quality stainless steel for durability and corrosion resistance
M18x1.5mm threads ensure compatibility with most oxygen sensors
Ideal for custom exhaust setups or replacing damaged bungs
Essential for automotive enthusiasts looking to upgrade their exhaust system

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Air Adjustment Unit/DISA Valve Kit

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T#:15677538

Part#: 11617533344-KT

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11-07-2026

$ 97.70 USD

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A bad DISA valve can cause a variety of issues, from a loud racket in the engine bay, hesitation at low rpm and a rough idle with lean codes. If the valve is making a loud noise, we recommend replacing it as soon as possible. It is possible for the pin holding the flap to be sucked into the motor causing serious damage. Very easy to replace, just need to undo the 4 bolts holding it to the intake manifold. Includes new mounting hardware

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1.5mm X 51mm Metric Buna-N 70 O-ring

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T#:388889

Part#: N1.50X051

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$ 3.89 USD

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1.5mm X 51mm Metric Buna-N 70 O-ring is the perfect sealing solution for various industrial applications. Made from high-quality Buna-N material, this O-ring provides reliable sealing performance, ensuring leak-free connections. With its metric sizing and 70 durometer hardness, it offers versatility and durability for a wide range of uses.

High-quality Buna-N material
Reliable sealing performance
Metric sizing for versatility
70 durometer hardness for durability

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Cold Climate Oil Separator Kit - Level 2

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T#:15744065

Part#: 114317400450-KT

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This product was last offered at the strikethrough price on
06-15-2026

$ 128.81 USD

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If you are ready to perform a truly complete oil separator system service, our Level 2 kit provides you with all of our Level 1 kit components plus a throttle body gasket, throttle body inlet boot, ICV grommet, and dipstick tube o-ring. Our Level 2 Cold Climate kit includes the following: Oil separator - BMW cold climate recommended Hose from oil separator to dipstick tube - BMW cold climate recommended Hose from oil separator to valve cover Hose from intake manifold back to the connector hose Hose from oil separator up to the intake manifold Throttle body gasket Throttle body inlet boot ICV rubber grommet Oil dipstick tube o-ring seal It is highly recommended to replace the oil dipstick tube with the updated design by BMW as this also a common place for sludge to build up.

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Idle Control Valve Kit

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T#:15744026

Part#: 11611437453-KT

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

$ 151.71 USD

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Located in the intake system, this part is a common source of idle issues. This kit includes a new mount and idle control valve grommet

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

For vehicles with production date up to 03/2003

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T#:5944219

Part#: 11781433940

Ships on Dec 4, 2026

$ 78.99 USD

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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

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Oxygen Sensor - Priced Each

T#:22064620

Part#: 11781247406

Special Order: No Guaranteed ETA

$ 55.99 USD

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

For vehicles with production date up to 03/2003

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T#:5944214

Part#: 11781247406

Back Ordered

$ 57.99 USD

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$ 57.99 USD

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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

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"Cold Climate" Crankcase Pressure Regulator Valve

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T#:35829339

Part#: 11617533400

Back Ordered

$ 69.99 USD

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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.

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

Sub-Categories

Turner Universal Baffled Oil Catch Can Mounting Bracket Kit - BMW & M...

Bav Auto Crankcase Pressure Regulator Valve - BMW M52 M54

Engine Oil Separator Package - Level 2 - E46 325, E39 525i M54 ...

ECS Tuning Baffled Oil Catch Can - 8oz

Electric Valve - For Secondary Air System Or Exhaust Flap

Oil Separator Kit - Level 1

Oil Separator Hose - E46, Z4

Bav Auto Crankcase Ventilation Return Hose - E46 E39 E60 Z3

Bav Auto Upper Oil Separator Vent Tube - E36 E46 E60 E84 Z3 Z4 M54 M5...

Stainless Steel Oxygen Sensor (O2) Weld Bung (M18x1.5mm) - Priced Eac...

Air Adjustment Unit/DISA Valve Kit

1.5mm X 51mm Metric Buna-N 70 O-ring

Cold Climate Oil Separator Kit - Level 2

Idle Control Valve Kit

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

Oxygen Sensor - Priced Each

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

"Cold Climate" Crankcase Pressure Regulator Valve

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