034 Motorsports, upgraded PCV breather hose EA839 2.9 / 3.0T

Upgrade the failure-prone factory plastic PCV breather hose with the high-performance and durable 034Motorsport PCV Breather Hose. Designed for EA839 engines, this breather hose enhances reliability and supports long-lasting performance.

What is the PCV System?

The PCV (Positive Crankcase Ventilation) system on the EA839 engine is located on bank 2 (the right side). It vents positive crankcase pressure through the breather hose into the intake system. This system uses check valves to control crankcase pressure flow and prevent harmful buildup.

Why is the OE PCV System Insufficient?

The factory PCV breather hose check valves are prone to failure due to high engine bay temperatures and the stress of transitioning between vacuum and boost. When they fail, excess pressure builds up in the crankcase, causing seals to leak and, in severe cases, oil to be expelled into the engine bay, risking a fire. Audi issued a TSB regarding these failures in 2020, but even the updated OEM hoses remain unreliable. Aftermarket solutions often compromise proper vacuum pressure, causing further issues with crankcase ventilation.

The Solution: 034Motorsport PCV Breather Hose

034Motorsport engineered this breather hose to address these shortcomings. It includes proprietary check valves designed for high-flow performance under extreme conditions, holding up to 40+ PSI. These valves are housed in a durable, 4-ply silicone hose that resists collapsing under vacuum or inflating under boost.

The hose is compatible with the OEM Air Oil Separator, ensuring proper crankcase pressure control for stock or tuned vehicles (up to Stage 3). It also retains compatibility with the factory engine cover and turbo inlets, offering a cost-effective and long-lasting solution.

Key Features:

• Direct replacement for the failure-prone OEM PCV hose
• Prevents crankcase pressurization by ensuring high-flow ventilation
• Eliminates potential boost leaks from the plastic check valve
• Supports boost pressures up to 40+ PSI
• Compatible with OEM and upgraded turbocharger inlets
• Features a CNC-machined billet aluminum check valve body (black anodized)
• Includes a durable, heat- and chemical-resistant rubber diaphragm
• Made from reinforced 4-ply silicone for maximum durability
• Allows for easy installation and retains the factory engine cover

The 034Motorsport PCV Breather Hose is not only a performance upgrade but also a crucial safety enhancement for all EA839-equipped vehicles. Extensively tested over two years on multiple development vehicles, it offers a reliable solution for both stock and tuned engines. With superior engineering and durable materials, this breather hose is built to last the lifetime of the vehicle, unlike the OEM component.

Compatible vehicles:

• Audi A6 (C8) (2019-2025)
• Audi A7 (C8) (2019-2025)
• Audi allroad (C8) (2019-2025)
• Audi S4 (B9/B9.5) (2018-2025)
• Audi S5 (B9/B9.5) (2018-2025)
• Audi SQ5 (B9/B9.5) (2018-2025)
• Audi S6 (C8) (2019-2025)
• Audi S7 (C8) (2019-2025)
• Audi RS4 (B9/B9.5) (2018-2025)
• Audi RS5 (B9/B9.5) (2018-2025)