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

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

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T#:2528129

Part#: 11617533400S1

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$ 79.09 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 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.

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Oxygen Sensor - Priced Each

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T#:35863157

Part#: 11781742050

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$ 49.99 USD

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This direct fit oxygen sensor plugs directly into your factory connector. It is the pre-cat sensor. No cutting or splicing required. A new oxygen sensor can improve driveability and lengthen engine life. It fits BMW E46 E39 E38 X3 X5 Z3 Z4. Bosch # 13 477.

This item fits the following BMWs:
1999-3/2003 E46 BMW 323i 323ci 325i 325ci 325xi 328i 328ci 330i 330xi 330ci
1999-2003 E39 BMW 525i 528i 530i M5
1997-2003 E39 BMW 540i
1995-2001 E38 BMW 750il
2004-2006 E83 BMW X3 2.5i X3 3.0i
2000-2006 E53 BMW X5 3.0i
2000-2003 E53 BMW X5 4.4i 4.6is
1999-2002 Z3 BMW Z3 2.3 Z3 2.5i Z3 2.8 Z3 3.0i
2003-2005 E85 BMW Z4 2.5i Z4 3.0i
2000-2003 E52 BMW Z8

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Leak Detection Pump - Priced Each

For vehicles with production date from 09/2001

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T#:35121140

Part#: 16137193479

In Stock

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11-07-2026

$ 50.24 USD

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Crankcase Vent Hose

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T#:30629661

Part#: 11157831311

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$ 22.39 USD

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Fuel Tank Breather Valve

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T#:591935

Part#: 13901433603

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$ 49.99 USD

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Valve between charcoal canister and throttle body

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

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T#:24344785

Part#: M54OILSEPKT

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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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Engine Crankcase Breather Element

Superior performance for both warm and cold climates

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T#:35795496

Part#: 11617533400

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$ 41.99 USD

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Commonly referred to as the "oil separator" or PCV URO Parts is one of the leading manufacturers of high quality direct replacement aftermarket components, covering a wide range of makes and models. All of their replacement parts are manufactured to ISO 9000 certification standards, so you can expect long lasting performance from URO Parts.

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Leak Detection Pump

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T#:15445597

Part#: 16136756440

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$ 153.99 USD

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Leak detection pump tests fuel containment system for vapor leaks to atmosphere. Failed pump often turns on check engine light.

Electric Valve - For Secondary Air System Or Exhaust Flap

T#:362205

Part#: 11747810831

In Stock

$ 74.99

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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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Suction Pump

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T#:377591

Part#: 11617545382

In Stock

$ 59.62

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

$ 53.99 USD

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$ 59.62

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A common source for vacuum leaks

Crankcase Pressure Regulator Valve

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T#:373032

Part#: 11617501566

Ships in 1 Business Day

$ 25.99 USD

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Commonly referred to as the "oil separator" or PCV

Upper Oil Separator Vent Tube

For vehicles with production date from 01/2000

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T#:362022

Part#: 11617504535

Ships in 1 Business Day

$ 20.99 USD

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$ 20.99 USD

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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.

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Pressure Hose

For vehicles with production date from 03/2003

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T#:585279

Part#: 11727555681

Back Ordered

$ 43.99 USD

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$ 43.99 USD

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Pressure hose for the secondary air pump system. This hose runs from the secondary air pump to the solenoid.

Vacuum Control Valve - E36 E39 E46 E53 E65 E66 E70 E83 E90

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T#:24179138

Part#: 11747810831

Ships in 1 Business Day

$ 27.99 USD

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$ 27.99 USD

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Vacuum control valve used in emissions control systems.

Bremmen Crankcase Ventilation Hose - E39 E53 E60 E83 E46

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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

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

Oil Separator Kit - Level 1

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T#:15710823

Part#: E46M5411_61KT

In Stock

Sale - Save 40% $ 124.99

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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Vacuum Control Valve

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T#:47850818

Part#: 11747810831

In Stock

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

$ 19.59 USD

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OEM BMW Engine Rubber Mounting 11727559515

For vehicles with production date up to 03/2003

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T#:13041

Part#: 11727559515

In Stock

$ 4.79 USD

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$ 4.79 USD

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OEM BMW RUBBER MOUNTING:116095

Crankcase Ventilation Hose

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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

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$ 11.19 USD

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URO Parts Non-Return Valve - 11611312737 - E36, E46, E34, E39, E24, E...

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T#:56977985

Part#: 11611312737

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$ 12.99 USD

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$ 12.99 USD

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Keep your BMW's vacuum and secondary air injection systems operating with complete efficiency under all driving conditions using this URO Parts non-return valve

Crankcase Ventilation Hose - E46 M3 Z3M Coupe S54

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T#:25109076

Part#: 11157831311

Ships on Dec 7, 2026

$ 17.99 USD

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$ 17.99 USD

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This hose runs from the oil separator to the intake manifold and is designed to allow the recirculation of built-up oil vapors.

Due to its proximity to engine heat, this hose tends to get brittle and break as it ages. This can lead to oil leaks, vacuum leaks, misfires, and more.

If your crankcase ventilation hose is brittle or leaking, replace it with this unit from URO Parts.

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Air Adjustment Unit/DISA Valve Kit

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T#:15677538

Part#: 11617533344-KT

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Sale - Save 40% $ 162.99

This product was last offered at the strikethrough price on
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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Cold Climate Oil Separator Kit - Level 2

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T#:15744065

Part#: 114317400450-KT

In Stock

Sale - Save 44% $ 231.99

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

$ 128.81 USD

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Sale - Save 44%

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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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Crankcase Ventilation Hose

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T#:378279

Part#: 11617533398

Ships in 1 Business Day

$ 21.99 USD

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$ 21.99 USD

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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.

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Return Pipe

For vehicles with production date from 01/2000

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T#:372847

Part#: 11617504536

Ships in 1 Business Day

$ 16.99 USD

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Runs from the intake manifold back to connecting hose

Crankcase Ventilation Dipstick Hose - BMW M52TU M54

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T#:359570

Part#: 11157532629

Ships in 1 Business Day

$ 12.99 USD

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$ 12.99 USD

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This tube runs from the oil separator to the lower dipstick tube.

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.

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Pressure Hose

For vehicles with production date up to 03/2003

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T#:372643

Part#: 11727555680

Ships in 1 Business Day

$ 17.99 USD

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Runs from the air pump to the solenoid valve

Crankcase Vent Hose - From Valve Cover to Oil Separator - E46 E39 E6...

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T#:2853

Part#: 11611432559

Ships in 1 Business Day

$ 14.99 USD

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$ 14.99 USD

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This Crankcase Vent Hose - From Valve Cover to Oil Separator fits BMWs with the M52 or M54 6 cylinder engine including E46 323i 325i 328i 330i E39 525i 528i 530i E60 525i 530i X3 2.5i 3.0i X5 3.0i Z3 2.5 2.8 3.0i Z4 2.5i 3.0i.

This item fits the following BMWs:
1999-2005 E46 BMW 323i 323ci 328i 328ci 330i 330ci 330xi
1999-2005 E46 BMW 325i 325ci 325xi - only with M54 engine
1999-2003 E39 BMW 528i 528i 530i
2004-2005 E60 BMW 525i 525xi 530i 530xi
2004-2006 E83 BMW X3 2.5i X3 3.0i
2000-2006 E53 BMW X5 3.0i
1999-2002 Z3 BMW Z3 2.3 Z3 2.5i Z3 2.8i Z3 3.0i
2003-2006 E85 BMW Z4 2.5i Z4 3.0i

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URO Crankcase Ventilation Hose - BMW M52TU M54

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T#:377307

Part#: 11157532649

Ships in 1 Business Day

$ 12.99 USD

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$ 12.99 USD

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From oil separator to dipstick tube

Idle Control Valve Kit

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T#:15744026

Part#: 11611437453-KT

In Stock

Sale - Save 15% $ 178.99

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

Oxygen Sensor - Front Or Rear Manifold

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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

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$ 119.99

This product was last offered at the strikethrough price on
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Oxygen Sensor - Priced Each

T#:22064620

Part#: 11781247406

Special Order: No Guaranteed ETA

$ 55.99 USD

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

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T#:47439371

Part#: 02SB1815

Ships on Jun 11, 2027

Sale - Save 46% $ 3.99

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

$ 2.14 USD

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Sale - Save 46%

$ 3.99

This product was last offered at the strikethrough price on
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$ 2.14 USD

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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

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

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