Emissions System for BMW Z Series E85/6 (2003-2008)

Oil Separator Valve

T#:594299

Part#: 11617531423

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$ 120.81 USD

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$ 120.81 USD

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The oil separator can be replaced on its own but for a complete service we also recommend replacing the oil separator hoses and cleaning the valve cover. Any valve cover or intake manifold work should include a new oil separator valve.

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"Cold Climate" Crankcase Pressure Regulator Valve

Superior performance for both warm and cold climates

T#:376770

Part#: 11617533400

Ships in 1 Business Day

$ 70.99

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

$ 40.99 USD

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$ 40.99 USD

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Commonly referred to as the "oil separator" or PCV

Crankcase Ventilation Hose

T#:378279

Part#: 11617533398

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$ 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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URO Crankcase Ventilation Hose - BMW M52TU M54

T#:377307

Part#: 11157532649

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$ 12.99 USD

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$ 12.99 USD

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From oil separator to dipstick tube

Secondary Air Pump

T#:37757223

Part#: 11727571591

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$ 181.99 USD

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$ 181.99 USD

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**Features:** - Optimized design for maximum airflow - Precision bearings ensure quiet operation with minimal vibration - Durable, high-quality housing for long-lasting performance

AutoTecknic Dry Carbon Competition Oil Cap Cover - Type 2 - For Vario...

T#:39971048

Part#: BM-0008

Ships in 7 Business Days

$ 64.99 USD

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$ 64.99 USD

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A precision-crafted dry carbon fiber upgrade that enhances the engine bay of compatible BMW and MINI vehicles with a lightweight, motorsport-inspired design and easy OEM-style installation

Genuine BMW Oxygen Sensor - E83 Z4

Rear

T#:13052

Part#: 11787513962

Ships in 1 day

13% off MSRP $ 325.99

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

$ 281.99 USD

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13% off MSRP

$ 325.99

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

$ 281.99 USD

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Genuine BMW Regulating Lambda Probe - L=320mm
This item fits the following BMW Chassis:
E83 X3,E85

Fits BMW Engines including:
M54

Pierburg Secondary Air Pump - E83, Z4

T#:379001

Part#: 11727571591

Ships in 1 day

$ 315.05 USD

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$ 315.05 USD

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Common source of emissons related issues

Genuine BMW Front Oxygen Sensor - bank 1 Pre-Cat

T#:367762

Part#: 11787558055

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13% off MSRP $ 406.99

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

$ 352.99 USD

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13% off MSRP

$ 406.99

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

$ 352.99 USD

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Crankcase Oil Separator Repair Kit - E85 Z4 2.5i 3.0i 2003-2006 ...

T#:2895

Part#: 11617533400-E85

Ships in 1 day

Sale - Save 5% $ 406.99

This product was last offered at the strikethrough price on
05-03-2026

$ 386.64 USD

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Sale - Save 5%

$ 406.99

This product was last offered at the strikethrough price on
05-03-2026

$ 386.64 USD

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This Crankcase Vent / Oil Separator Repair Kit includes the updated oil separator valve, oil dipstick guide tube and hoses. This kit fits E85 Z4 2.5i Z4 3.0i 2003-2005.

This item fits the following BMWs:
2003-2006 E85 BMW Z4 2.5i Z4 3.0i

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Pierburg Air Pump Control Valve - E53, E60, Z4

T#:379003

Part#: 11727553067

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$ 144.02 USD

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$ 144.02 USD

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Located on the cylinder head, allows air to enter into the exhaust

Return Pipe - E46, Z3, Z4

T#:36176

Part#: 11537838756

Ships in 1 day

1% off MSRP $ 587.99

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

$ 583.99 USD

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1% off MSRP

$ 587.99

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

$ 583.99 USD

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Genuine BMW Return Pipe
This item fits the following BMW Chassis:
E46 M3,E85 Z4M,E46,E85 Z4,E86 Z4

Fits BMW Engines including:
S54

Secondary Air Pump Bracket - E46, Z4

T#:37420

Part#: 11727514955

Ships in 1 day

2% off MSRP $ 50.99

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

$ 49.99 USD

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2% off MSRP

$ 50.99

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

$ 49.99 USD

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Genuine BMW Secondary Air Pump Bracket -
This item fits the following BMW Chassis:
E46,E85

Fits BMW Engines including:
M54,M56

Crankcase Ventilation Hose

T#:30629689

Part#: 11157532649

In Stock

Sale - Save 24% $ 15.99

This product was last offered at the strikethrough price on
05-03-2026

$ 12.23 USD

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Sale - Save 24%

$ 15.99

This product was last offered at the strikethrough price on
05-03-2026

$ 12.23 USD

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OEM Febi Crankcase Ventilation Return Hose - E60 E90 Z4 N52 3.0L ...

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T#:38452821

Part#: 11157527570

Special Order: No Guaranteed ETA

$ 93.99 USD

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$ 93.99 USD

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For your BMW's optimal performance, ensure the functionality of the hose connecting the oil dipstick to the crankcase vent valve. Positioned below the intake manifold, this hose is susceptible to clogging with oil film and condensation, leading to potential failure over time. Cracks and swelling in old hoses can result in oil and vacuum leaks, compromising engine performance.

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Febi Rear Oxygen Sensor - Bank 1 Post-Cat

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T#:16375111

Part#: 11787526262

Special Order: No Guaranteed ETA

$ 124.99 USD

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$ 124.99 USD

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The oxygen sensor is vital to the performance and drivability of your car. The engine computer relies on data from the sensor to make adjustments in engine efficiency and performance. When your BMW oxygen sensor fails, the computer can no longer sense the air/fuel ratio, so it ends up guessing -- resulting in poor performance, poor gas mileage, and increased pollution. Make sure your BMW engine performs as it should, and doesn't use more fuel than it needs to, by simply changing your oxygen sensor today. There is no lifespan on O2 sensors but there are several fault codes that indicate a failed sensor (O2 monitoring, cat efficiency, O2 heating circuit, O2 readiness, and others). The O2 sensor is heated and has a self-calibration feature so once you get the codes or feel performance has suffered, a new sensor is a good starting point to get you back to peak performance. Febi's Oxygen sensors are high quality and will give you the longest and best performance for the price.

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Meyle Oxygen Sensor - Pre-Cat Bank 2 - E9X E60 E82 N52

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T#:5944212

Part#: 11787558073

Special Order: No Guaranteed ETA

$ 123.99 USD

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$ 123.99 USD

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Bad oxygen sensors can cause check engine lights and poor fuel mileage. Replace your faulty sensor with this high-quality Meyle sensor to turn off your check engine light and restore fuel mileage. This is a Meyle oxygen sensor for BMWs with the N52 engine. This sensor is mounted in the rear downpipe before the catalytic converter. Replacement for BMW # 11787558073 and 11787537984. As a leading source of high-performance BMW parts and accessories since 1993, we at Turner Motorsport are honored to be the go-to supplier for tens of thousands of enthusiasts the world over. With over two decades of parts, service, and racing experience under our belt, we provide only quality performance and replacement parts. All of our performance parts are those we would (and do!) install and run on our own cars, as well as replacement parts that are Genuine BMW or from OEM manufacturers. We only offer parts we know you can trust to perform!

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Meyle Oxygen Sensor - BMW F10/12/13 M S63, Z4 N52 3.0L

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T#:5973207

Part#: 11787539137

Special Order: No Guaranteed ETA

$ 102.99 USD

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$ 102.99 USD

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The O2 sensor measures the amount of unburned fuel in the exhaust pipe to adjust fuel mapping for less emissions and better fuel economy. When malfunctioning, your MPG and performance can suffer. Replaced fairly easily, you can restore your performance and mileage quickly. Be sure to add anti-seize on the threads to prevent it from becoming a permanent part of the exhaust. Regularly scheduled maintenance as these tend to fail slowly.

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Meyle Rear Bank 1 Post-Cat Oxygen Sensor - 560mm - E70 E83 E82/88 E9X...

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T#:5944215

Part#: 11787545074

Special Order: No Guaranteed ETA

$ 116.99 USD

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$ 116.99 USD

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The oxygen sensor is vital to the performance and drivability of your car. The engine computer relies on data from the sensor to make adjustments in engine efficiency and performance. When your BMW oxygen sensor fails, the computer can no longer sense the air/fuel ratio, so it ends up guessing -- resulting in poor performance, poor gas mileage, and increased pollution. Make sure your BMW engine performs as it should, and doesn't use more fuel than it needs to, by simply changing your oxygen sensor today. There is no lifespan on O2 sensors but there are several fault codes that indicate a failed sensor (O2 monitoring, cat efficiency, O2 heating circuit, O2 readiness, and others). The O2 sensor is heated and has a self-calibration feature so once you get the codes or feel performance has suffered, a new sensor is a good starting point to get you back to peak performance. This is a Meyle oxygen sensor for BMW's with the N52, N54, and N55 3.0L engines. This 560mm bank 1 oxygen sensor is mounted after the catalytic converter. As a leading source of high-performance BMW parts and accessories since 1993, we at Turner Motorsport are honored to be the go-to supplier for tens of thousands of enthusiasts the world over. With over two decades of parts, service, and racing experience under our belt, we provide only quality performance and replacement parts. All of our performance parts are those we would (and do!) install and run on our own cars, as well as replacement parts that are Genuine BMW or from OEM manufacturers. We only offer parts we know you can trust to perform!

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Pierburg Vacuum Pump - BMW N52 3.0L

T#:380841

Part#: 11667519457

Special Order: No Guaranteed ETA

$ 225.99 USD

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$ 225.99 USD

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If your vacuum pump is noisy then it is only a matter of time before it fails, leading to idling issues and a loss of braking power. Replace yours with this OEM Pierburg Vacuum Pump to ensure the smooth operation of the vacuum system.

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

T#:47439371

Part#: 02SB1815

Ships on Mar 29, 2027

Sale - Save 39% $ 3.99

This product was last offered at the strikethrough price on
05-03-2026

$ 2.44 USD

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Sale - Save 39%

$ 3.99

This product was last offered at the strikethrough price on
05-03-2026

$ 2.44 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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Crankcase Oil Separator and Vent Hose Kit - E90 325i/330i, E60 525i/5...

T#:338253

Part#: 11617531423KIT

Ships in 1 day

Starting at $ 554.99 USD

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Starting at $ 554.99 USD

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The BMW N52 engine was deisgned with a crankcase vent system that relies on a heated oil separator valve to separate vapor from the liquid oil. Under ideal circumstances, the oil vapor would pass back into the intake and get burned up during normal combustion. The liquid oil would follow a path back down into the oil pan and be reused. This system is environmentally friendly but plagued with problems. The heating elements can fail or oil and carbon particles can block the oil separator valve. With no escape, the oil will continue to pool and collect in the valve cover or make its way into the combustion chamber leading to excessive oil consumption, blue smoke from the exhaust, idle and running issues. These issues are worse in colder climates where the freezing temperatures create an oil sludge condition that is impossible to clear. The plastic hoses can become brittle and crack which leads to vacuum leaks and oil leaks. Thankfully, the CCV is replaceable on the early N52 engines (2006 and some 2007 models) and should be inspected during a major service and any time the valve cover is off. Oil can also back up into the throttle body, which is easier to check than the oil separator itself. Later N52 engines do not have a serviceable oil vent as it is integrated into the valve cover and not a separate part.

This is a kit containing the oil separator, the vent hoses, and the intake manifold gaskets that are done during a typical oil separator replacement. Complete kit includes:

11617531423, Genuine BMW oil separator

11617559530, vent hose

11157522931, oil separator hose

11157567801, return hose

11157537701, extraction hose

11617547242, intake manifold gaskets (set of 6)
The intake manifold must be removed to access the oil separator so new profile gaskets are included. We also recommend (but not required) a new oil separator fitting on the intake manifold because it's one of the heated elements that vaporizes the oil as it enters the intake.

The oil separator can be replaced on its own but for a complete service we also recommend replacing the oil separator hoses and cleaning the valve cover. Any valve cover or intake manifold work should include a new oil separator valve.

This kit fits the following BMWs:
2006-2011 E90 BMW 325i 325xi 330i 330xi - Sedan
2006-2012 E91 BMW 325xi - Wagon
2006-2007 E60 BMW 525i 525xi 530i 530xi
2006-2008 E85 BMW Z4 3.0i Z4 3.0si

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Emissions System for BMW Z Series E85/6 (2003-2008)

Sub-Categories

Oil Separator Valve

"Cold Climate" Crankcase Pressure Regulator Valve

Crankcase Ventilation Hose

URO Crankcase Ventilation Hose - BMW M52TU M54

Secondary Air Pump

AutoTecknic Dry Carbon Competition Oil Cap Cover - Type 2 - For Vario...

Genuine BMW Oxygen Sensor - E83 Z4

Pierburg Secondary Air Pump - E83, Z4

Genuine BMW Front Oxygen Sensor - bank 1 Pre-Cat

Crankcase Oil Separator Repair Kit - E85 Z4 2.5i 3.0i 2003-2006 ...

Pierburg Air Pump Control Valve - E53, E60, Z4

Return Pipe - E46, Z3, Z4

Secondary Air Pump Bracket - E46, Z4

Crankcase Ventilation Hose

OEM Febi Crankcase Ventilation Return Hose - E60 E90 Z4 N52 3.0L ...

Febi Rear Oxygen Sensor - Bank 1 Post-Cat

Meyle Oxygen Sensor - Pre-Cat Bank 2 - E9X E60 E82 N52

Meyle Oxygen Sensor - BMW F10/12/13 M S63, Z4 N52 3.0L

Meyle Rear Bank 1 Post-Cat Oxygen Sensor - 560mm - E70 E83 E82/88 E9X...

Pierburg Vacuum Pump - BMW N52 3.0L

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

Crankcase Oil Separator and Vent Hose Kit - E90 325i/330i, E60 525i/5...

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