BMW E36/E46/E39/E60/E53 M52/M54 Replacement Crankcase Ventilation PCV Breather Hose – Restore Proper Crankcase Ventilation, Prevent Vacuum Leaks & Support Engine Performance | Replaces Part No. 11611432559

Restore proper crankcase ventilation and help prevent unwanted vacuum leaks with this replacement PCV crankcase breather vent hose designed for select BMW 3 Series, 5 Series, and X5 vehicles equipped with compatible M52 and M54 inline-six gasoline engines. The crankcase ventilation system, commonly referred to as the PCV or CCV system, plays an essential role in managing combustion blow-by gases, controlling internal crankcase pressure, and directing oil-containing vapors through the engine's ventilation system. Maintaining properly sealed breather hoses is important for stable engine idling, correct air-fuel mixture regulation, and the long-term reliability of engine seals and gaskets. This replacement hose is intended to restore the original ventilation connection associated with BMW part number 11611432559. 

As factory crankcase ventilation hoses age, continuous exposure to engine heat, oil vapors, vibration, and repeated heating and cooling cycles can cause the original hose material to deteriorate. Plastic connections may become brittle, rubber sections can develop cracks, and sealing surfaces may weaken around their attachment points. These problems can allow unwanted air to enter the intake system or permit crankcase vapors to escape through damaged connections. Common symptoms include rough idling, fluctuating engine speed, whistling or hissing noises, oil residue around ventilation components, and engine fault codes associated with lean air-fuel mixtures.

This replacement crankcase breather hose is intended to restore the original ventilation passage associated with BMW part number 11611432559. The hose forms part of the engine's crankcase ventilation arrangement, helping direct crankcase gases through the intended system rather than allowing them to escape through deteriorated connections. Replacing a cracked, disconnected, or damaged hose can help eliminate ventilation-related air leaks and support normal crankcase pressure regulation when the original component is responsible for the problem.

BMW's M52 and M54 inline-six engines use crankcase ventilation components to manage blow-by gases and oil vapor circulation. The system relies on properly sealed connections between the engine, ventilation valve, and intake components. A damaged breather hose can disrupt this arrangement, contribute to unmetered air entering the intake system, and interfere with the engine management system's ability to maintain stable operating conditions. Correct hose routing, secure connections, and compatibility with the vehicle's specific engine configuration are essential for reliable operation.

For aging BMW vehicles, inspecting and replacing deteriorated crankcase ventilation hoses is an important part of preventive engine maintenance. Addressing ventilation leaks before they become severe can help reduce recurring idle problems, limit unwanted oil vapor escape, and maintain the intended operation of the crankcase ventilation system. A correctly matched replacement hose also helps preserve the factory ventilation arrangement without requiring modifications to compatible original connections.

Key Features

• BMW Inline-Six Engine Applications: Intended for select BMW vehicles equipped with compatible M52-family crankcase ventilation systems using the hose identified by BMW part number 11611432559.

• Restores Proper Crankcase Ventilation Flow: Helps maintain the intended movement of combustion blow-by gases through the engine's ventilation circuit.

• Helps Prevent Vacuum Leaks: Replacing a cracked, deteriorated, or improperly sealed breather hose can eliminate unmetered air leaks originating from the original component.

• Supports Stable Engine Idling: Correcting crankcase ventilation air leaks may help reduce rough idling, fluctuating engine speed, and lean-running symptoms when the damaged hose is responsible.

• Maintains the Intended Ventilation Connection: Designed around the original BMW crankcase breather hose configuration associated with part number 11611432559.

• Helps Reduce Oil Vapor Leakage: A properly sealed breather hose helps contain crankcase vapors within the designated ventilation system.

• Supports Crankcase Pressure Management: Maintaining sealed ventilation connections allows the engine's pressure-regulating components to function as intended.

• Addresses Aging-Related Hose Deterioration: Suitable for replacing original hoses affected by cracks, brittle fittings, hardened sections, damaged connectors, or prolonged exposure to engine-bay heat.

• Factory-Style Replacement Configuration: Intended to maintain the original hose routing and connection arrangement when installed on a compatible BMW engine.

• Important Preventive Engine Maintenance: Replacing deteriorated ventilation hoses can help reduce recurring vacuum leaks and support reliable engine operation.

Restore the intended crankcase ventilation performance of your BMW with a correctly matched replacement breather hose designed to maintain sealed ventilation connections and reliable crankcase gas flow. Replacing deteriorated components can help reduce unwanted air leaks, support stable engine idling, and preserve the proper operation of the existing crankcase ventilation system. For older BMW inline-six engines, maintaining the condition of ventilation hoses is an important step toward dependable engine performance and long-term reliability.

FITMENT: BMW E46 3 Series, E39/E60 5 Series, E53 X5, E83 X3, Z3 & Z4

BMW part number 11611432559 is identified in BMW parts catalogs as a crankcase ventilation vent pipe connecting the valve cover to the oil separator on compatible M52TU and M54 engines. Its application extends across several BMW chassis, but compatibility depends on the engine and production date. ECS Tuning

BMW E46 3 Series Sedan (1999–2005)

• BMW E46 320i – M54B22 2.2L Engine, select markets
• BMW E46 323i – M52TUB25 2.5L Engine (1999–2000)
• BMW E46 325i – M54B25 2.5L Engine (2001–2005)
• BMW E46 325xi – M54B25 2.5L Engine (2001–2005)
• BMW E46 328i – M52TUB28 2.8L Engine (1999–2000)
• BMW E46 330i – M54B30 3.0L Engine (2001–2005)
• BMW E46 330xi – M54B30 3.0L Engine (2001–2005)

BMW E46 3 Series Coupe (2000–2006)

• BMW E46 323Ci – M52TUB25 2.5L Engine (2000)
• BMW E46 325Ci – M54B25 2.5L Engine (2001–2006)
• BMW E46 328Ci – M52TUB28 2.8L Engine (2000)
• BMW E46 330Ci – M54B30 3.0L Engine (2001–2006)

BMW E46 3 Series Convertible (2000–2006)

• BMW E46 323Ci Convertible – M52TUB25 2.5L Engine
• BMW E46 325Ci Convertible – M54B25 2.5L Engine
• BMW E46 330Ci Convertible – M54B30 3.0L Engine

BMW E46 3 Series Touring (1999–2005)

• BMW E46 323i Touring – M52TU 2.5L Engine, select markets
• BMW E46 325i Touring – M54B25 2.5L Engine
• BMW E46 325xi Touring – M54B25 2.5L Engine

BMW E39 5 Series Sedan (1998–2003)

• BMW E39 520i – M52TU/M54 Engine, select markets
• BMW E39 523i – M52TU Engine, select markets
• BMW E39 525i – M54B25 2.5L Engine (2001–2003)
• BMW E39 528i – M52TUB28 2.8L Engine (1998–2000)
• BMW E39 530i – M54B30 3.0L Engine (2001–2003)

BMW E39 5 Series Touring (1998–2004, Depending on Market)

• BMW E39 520i Touring – M52TU/M54 Engine, select markets
• BMW E39 525i Touring – M54B25 2.5L Engine
• BMW E39 528i Touring – M52TUB28 2.8L Engine
• BMW E39 530i Touring – M54B30 3.0L Engine, select markets

BMW E60 5 Series Sedan (2004–2005 M54 Applications)

• BMW E60 525i – M54B25 2.5L Engine
• BMW E60 530i – M54B30 3.0L Engine

BMW E53 X5 (2001–2006)

• BMW E53 X5 3.0i – M54B30 3.0L Engine

BMW E83 X3 (2004–2006)

• BMW E83 X3 2.5i – M54B25 2.5L Engine
• BMW E83 X3 3.0i – M54B30 3.0L Engine

BMW Z3 Roadster & Coupe (1998–2002)

• BMW Z3 2.3 – M52TU 2.5L Engine
• BMW Z3 2.5i – M54B25 2.5L Engine
• BMW Z3 2.8 – M52TU 2.8L Engine
• BMW Z3 3.0i – M54B30 3.0L Engine

BMW E85 Z4 Roadster (2003–2005)

• BMW Z4 2.5i – M54B25 2.5L Engine
• BMW Z4 3.0i – M54B30 3.0L Engine

Important Fitment Information

The applications above represent vehicles associated with the M52TU/M54 crankcase ventilation system. The 320i, 520i, 523i, and certain Touring applications require additional VIN-based verification before being treated as confirmed fitments.

The original product title includes BMW E36 and model years 2003–2010. However, standard E36 3 Series applications are not established for this hose. The E36-based Z3 is a separate, documented application.

Likewise, 2010 model-year compatibility should not be advertised for this part without specific catalog confirmation. Later BMW engines generally use different crankcase ventilation arrangements.

For the E53 X5, certain catalogs identify production-date restrictions, so the model year alone is insufficient to guarantee fitment. ECS Tuning

Engine Compatibility

BMW M52TU Engine Family

• BMW M52TUB20 – 2.0L Inline-Six Gasoline Engine, selected applications
• BMW M52TUB25 – 2.5L Inline-Six Gasoline Engine
• BMW M52TUB28 – 2.8L Inline-Six Gasoline Engine

BMW M54 Engine Family

• BMW M54B22 – 2.2L Inline-Six Gasoline Engine
• BMW M54B25 – 2.5L Inline-Six Gasoline Engine
• BMW M54B30 – 3.0L Inline-Six Gasoline Engine

OEM Replacement Part Number

• 11611432559 – Crankcase Ventilation Hose / Vent Pipe
• 11 61 1 432 559 – Alternate BMW Part Number Formatting

Both numbers identify the same BMW component.

Component Function

BMW part number 11611432559 identifies the crankcase ventilation hose that connects the engine's valve cover to the oil separator within compatible M52TU and M54 crankcase ventilation systems.

The hose transfers blow-by gases from the valve cover into the ventilation system, where the oil separator regulates crankcase ventilation and separates oil mist from the gases.

This part is a hose, not the complete PCV valve or oil separator assembly.

The original product title describes it as a PCV crankcase valve breather vent hose. For accurate product identification, it should be marketed specifically as a crankcase ventilation hose rather than a complete crankcase ventilation valve.

Standard vs. Cold-Climate Configuration

BMW offered different crankcase ventilation configurations for certain applications, including insulated cold-climate components.

Part number 11611432559 is associated with the standard, non-insulated ventilation hose configuration. Cold-climate ventilation systems may use an insulated hose or additional protective components.

Customers should confirm the existing hose configuration before ordering. BimmerWorld

Installation

• Factory-style replacement crankcase ventilation hose for compatible BMW M52TU and M54 engines.
• Professional installation is recommended, particularly when the crankcase ventilation system has multiple deteriorated components.
• Allow the engine to cool completely before beginning the replacement procedure.
• Park the vehicle securely and switch off the engine before disconnecting intake or ventilation components.
• Locate the crankcase ventilation hose connecting the valve cover to the oil separator.
• Remove the necessary engine covers or surrounding intake components to access the original hose.
• Inspect the original hose for cracks, brittle plastic, damaged connectors, oil residue, or other signs of deterioration.
• Inspect the valve cover ventilation outlet for damaged fittings or accumulated deposits.
• Inspect the oil separator connection for cracks, contamination, or damaged retaining features.
• Carefully release the original hose from the valve cover connection.
• Disconnect the opposite end of the hose from the oil separator.
• Use caution when removing aged plastic connectors, as prolonged exposure to engine heat can make them brittle.
• Avoid damaging the valve cover fitting or oil separator connection during removal.
• Compare the replacement hose with the original component to confirm the correct shape, length, connector arrangement, and routing.
• Inspect the replacement hose for shipping damage or defective connectors before installation.
• Clean the corresponding connection points to remove dirt, loose deposits, and accumulated contamination.
• Inspect any required sealing components and replace them if damaged or specified by the applicable BMW service procedure.
• Install the replacement hose onto the corresponding valve cover connection.
• Connect the opposite end to the oil separator.
• Ensure both hose connections are fully seated and properly secured.
• Verify that the hose follows the original factory routing.
• Avoid twisting, kinking, or placing excessive tension on the replacement hose.
• Ensure the hose maintains adequate clearance from surrounding moving components and high-temperature surfaces.
• Reinstall any intake components, engine covers, or mounting hardware removed during the replacement procedure.
• Start the engine and inspect the replacement hose connections for abnormal hissing noises or signs of air leakage.
• Verify that the engine idles normally and that the ventilation connections remain securely attached.
• If rough idling or ventilation-related fault codes persist, inspect the remaining crankcase ventilation components.
• Perform an appropriate intake smoke test or crankcase pressure test when necessary to confirm proper system operation.

Replacing a mechanical crankcase ventilation hose does not ordinarily require engine control module programming or electronic calibration.

However, the exact replacement procedure may vary depending on the vehicle's engine configuration and accessibility of the oil separator.

Compatibility Notes

• Verify the Original BMW Part Number: Confirm that the existing crankcase ventilation hose corresponds to BMW part number 11611432559.

• Alternate Part Number Formatting: BMW part numbers 11611432559 and 11 61 1 432 559 identify the same component.

• Crankcase Ventilation Hose vs. PCV Valve: This product replaces a ventilation hose, not the complete pressure-regulating valve or oil separator.

• Valve Cover-to-Oil Separator Connection: The referenced hose connects the valve cover to the crankcase ventilation oil separator on compatible M52TU/M54 engines.

• BMW E46 Compatibility: Select E46 323i, 323Ci, 325i, 325Ci, 325xi, 328i, 328Ci, 330i, 330Ci, and 330xi applications use this hose.

• BMW E39 Compatibility: Select E39 525i, 528i, and 530i models are confirmed in aftermarket fitment catalogs. Other regional models require individual verification.

• BMW E60 Compatibility: Early E60 525i and 530i vehicles equipped with M54 engines are associated with this component. Later N52-powered vehicles use different ventilation arrangements.

• BMW E53 X5 Compatibility: Select X5 3.0i vehicles equipped with the M54 engine use this hose. Production-date restrictions may apply.

• BMW E83 X3 Compatibility: Select X3 2.5i and 3.0i models equipped with M54 engines use the corresponding ventilation hose.

• BMW Z3 and Z4 Compatibility: Select M52TU/M54-powered Z3 and M54-powered Z4 applications are associated with this component.

• BMW E36 Compatibility: Standard E36 3 Series applications are not confirmed for this part. Do not confuse these vehicles with the E36-based Z3.

• M52 vs. M52TU Compatibility: The original M52 and updated M52TU engines use different crankcase ventilation configurations. Confirm the exact engine version before ordering.

• M54 Engine Compatibility: The hose is associated with M54B22, M54B25, and M54B30 engines in compatible vehicle applications.

• Standard vs. Cold-Climate Hose: Vehicles equipped with insulated cold-climate crankcase ventilation components may require a different hose configuration.

• Inspect the Original Hose Configuration: Compare the replacement hose's length, shape, connection points, and routing with the original component before installation.

• Check the Oil Separator: A malfunctioning oil separator can cause abnormal crankcase pressure, excessive oil consumption, and rough idling. Replacing the breather hose alone will not correct an internal oil separator failure.

• Inspect Related Ventilation Hoses: BMW M52TU/M54 crankcase ventilation systems use several connected hoses. Inspect the remaining hoses for similar aging-related deterioration.

• Vacuum Leaks Can Cause Similar Symptoms: Rough idling, hissing noises, and lean-running conditions can also originate from damaged intake boots, intake manifold gaskets, or other vacuum connections.

• Oil Consumption Requires Proper Diagnosis: Excessive oil consumption may be associated with crankcase ventilation problems, but it can also result from worn piston rings, valve stem seals, external leaks, or other mechanical conditions.

• Inspect the Valve Cover Connection: Damaged valve cover fittings can prevent the replacement hose from sealing correctly.

• Confirm Included Components: BMW part number 11611432559 identifies the ventilation hose. Do not assume that additional PCV valves, oil separators, gaskets, or other hoses are included unless confirmed by the supplier.

• OEM Reference vs. Genuine BMW: The BMW part number identifies the original equipment component being replaced. It does not independently establish that the replacement is manufactured or packaged by BMW.

• Verify Fitment Using Your VIN: Confirm BMW part number 11611432559 against the vehicle's production date, engine configuration, and appropriate electronic parts catalog before purchasing.

Maintaining the crankcase ventilation system is particularly important for aging BMW M52TU and M54 inline-six engines, where brittle plastic hoses, deteriorated connections, and malfunctioning oil separators can contribute to vacuum leaks, rough idling, abnormal crankcase pressure, and excessive oil consumption. Replacing a damaged valve cover-to-oil separator breather hose with the correctly matched component helps restore the intended ventilation pathway, maintain properly sealed connections, and support consistent engine operation. Inspecting the remaining crankcase ventilation hoses, oil separator, and intake connections during replacement can further improve system reliability and help preserve the smooth, dependable performance of your BMW engine.