Audi VW Engine Crankcase Breather Hose - 034Motorsport 0341042003

Product Information

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.

• 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.

About 034Motorsport

034Motorsport was founded by Javad Shadzi in 2005, with a passion for bringing motorsport-quality performance upgrades and tuning to Audi and Volkswagen vehicles. The company has since evolved and grown to meet the expanding needs of enthusiasts, but the underlying passion for innovation, performance, and quality remains. We are dedicated to providing our customers with only the best performance products, tuning, and service for their Audi or Volkswagen.

034Motorsport is owned and operated by enthusiasts like you! This means you can expect knowledgeable advice and enthusiastic customer service every time. When we aren't at work, you can find us at local car meets, Audi Club Track Days, or at home wrenching on our own cars.

034Motorsports prides themselves on developing the finest track-proven and street-friendly performance upgrades for Audi and Volkswagen enthusiasts. The 034Motorsport Performance Facility in Fremont, CA is home to our engineering, manufacturing, and tuning departments. Staffed by highly-skilled enthusiasts, these departments work in unison to design, test, build, and calibrate the latest in performance upgrades for Audi and Volkswagen applications. Unlike other companies that merely drop-ship parts or outsource development, they do it all under one roof to ensure that 034Motorsport products are the highest quality on the market.