037 103 211A – Engine Breather Hose Kit

Description

The 037103211A Breather Hose connects the engine block to the valve cover as part of the positive crankcase ventilation system. It routes blow-by gases from the crankcase back into the intake system for combustion. Consequently, it helps reduce emissions and maintain correct crankcase pressure balance.

Because this hose is constantly exposed to heat and oil vapor, the original rubber material can harden and crack over time. Replacing a deteriorated 037103211A Breather Hose restores proper ventilation flow and helps prevent vacuum leaks from developing in the PCV circuit.

Why Crankcase Ventilation Hoses Matter

The PCV system depends on sealed, flexible hoses to move crankcase gases efficiently. A cracked or collapsed hose disrupts the pressure balance between the crankcase and intake system. Therefore, even a small breach in the hose can introduce unmetered air into the engine.

Furthermore, a failed hose may allow oil vapor to escape into the engine bay rather than returning it to the intake. This can contribute to oil residue on nearby components and trigger fuel-trim or vacuum-related fault codes. Replacing the hose is a straightforward repair that supports overall engine health.

Signs of 037103211A Breather Hose Failure

Inspect the crankcase ventilation hoses if you notice any of these symptoms:

• Rough or unstable idle that worsens at operating temperature.

• A hissing or whistling noise from the engine bay.

• Oil residue on the outside of the hose or nearby components.

• Check engine lights related to vacuum or fuel-trim faults.

• Visible cracks, brittleness, or collapsed sections on the hose.

• Increased oil consumption without a visible external leak.

• A strong oil-vapor smell from the engine bay.

Key Features

• OE Part Number: 037 103 211 A

• Function: Routes crankcase blow-by gases from the engine block to the valve cover.

• System: Part of the positive crankcase ventilation circuit.

• Construction: Heat- and oil-resistant material for long-term durability.

• Fitment: Direct OEM-style replacement requiring no modifications.

• Performance: Helps restore correct crankcase pressure balance and emissions control.

Service Notes

Always verify fitment by VIN before ordering. Before installing the replacement, inspect all connected PCV fittings, clamps, and the PCV valve itself for wear or damage. Furthermore, a cracked hose often indicates that other ventilation components may also be near the end of their service life.

Compatibility

Always verify fitment by VIN before ordering. Fitment depends on engine code, model year, crankcase ventilation layout, and original installed part number.

Cross Reference

• 037 103 211 A

Additional information