Audi Crankcase Breather Hose - Genuine Audi 06E103207AR

Sometimes the Genuine Part Is the Right Call

Engine Crankcase Breather Hose

An engine crankcase breather hose is a primary component of an engine's positive crankcase ventilation system, funneling pressurized air from the engine crankcase to the air/oil separator, also known as the PCV valve. The PCV valve, or air/oil separator, is designed to capture and remove oil vapors from the pressurized crankcase air, allowing them to drain back to the engine, while the pressurized air is fed to the intake side of the engine and utilized as part of normal combustion.

An engine develops positive crankcase pressure as a byproduct of the overall combustion process. Because of the combination of pressure, heat, and the air/oil-vapor mixture traveling to the PCV valve, the engine crankcase breather hose is a common failure item within the PCV system and is crucial to your car's engine's performance and emissions compliance.

Engine Crankcase Breather Hose Failure Symptoms

• Cracks breaks, leaks: Over time, your engine crankcase breather hose can be easily damaged because of constant exposure to oil vapors, heat, and pressure from the engine. The engine oil can slowly break down the plastic or rubber materials, eventually causing an air leak. This can happen naturally, or because it is damaged from external contact.
• Broken connectors: Plastic can become brittle over time, especially when exposed to heat and oil, and it's easy to break one of the securing clips or connectors for a PCV hose, either during removal or during other services.
• Broken or damaged hose: Soft rubber or brittle plastic, depending on the material of the hose, can result in an obvious hole or split in an engine crankcase breather hose, usually accompanied by one of the other faults listed below.
• Check Engine Light: Excessive unmetered air from a failed engine crankcase breather hose can result in a CEL for an air intake leak fault or other airflow-related diagnostic trouble codes.
• Misfire: A severe air intake leak can cause rough running and an engine misfire, a common side effect of a bad engine crankcase breather hose or PCV Valve
• Oil residue on or around the hose or adjacent components: As engine crankcase vapors escape from a faulty engine crankcase breather hose, the hose, engine block, and adjacent components are likely to become visibly soiled with oil residue and moisture. In the most severe cases, you will smell burning or burnt oil, and you may need to degrease the area to determine the exact cause of the oil residue.

Bottom line: if you want the exact part Audi built the car with, not a cross-reference, this is it.

Engine Crankcase Breather Hose FAQ

Is this a genuine Audi part or an aftermarket reproduction?
This is a genuine Audi OEM part, part number 06E103207AR, not an aftermarket reproduction.

How do I know if my breather hose needs replacing?
Common signs are a check engine light for an air intake leak, rough idle or misfire, and visible oil residue around the hose or adjacent components.

Is this a direct bolt-on replacement?
Yes, it's manufactured to factory dimensions and drops in where the original hose lived, cross-referencing Audi part 06E103207AR and its supersession chain (06E103207AE, 06E103207AJ).

What should I inspect while replacing this hose?
Check the surrounding clamps and connectors at the same time, since brittle plastic in one spot often means nearby fittings are due for a look too.

Complete Your Build

Already in the valley? Pair this genuine hose with:

• Vorsprung Crankcase Breather Hose, 06E103207AR cross-reference — a lower-cost cross-reference alternative to this genuine part, same fitment.
• OE Ultimate Under Supercharger Kit (B8.5 & C7) — if you're already replacing the PCV valve or thermostat, do this hose in the same service window.

Drive the difference. Drive Vorsprung.