VW Golf MK4 / Jetta MK4 / Bora & Audi A3 8L 1.8T AUM / AUQ Silicone Crankcase Breather Hose Kit 1998 - 2006 (5-Piece Set)

Replace your aged, cracked, and leaking factory crankcase breather hoses with this premium 5-piece silicone breather hose kit, hand-crafted from multi-ply silicone and nylon-reinforced construction for permanent durability and superior heat resistance. Factory rubber breather hoses on the 1.8T AUM and AUQ engines are notorious for hardening, splitting, and developing vacuum leaks after years of underhood heat exposure — leading to rough idling, oil leaks, increased oil consumption, check engine lights, and persistent vacuum leak codes that frustrate VAG enthusiasts. This silicone replacement kit permanently eliminates the recurring breather hose failure problem with bursting pressure of 245 PSI, temperature tolerance from -60°C to +260°C, and visual presentation that elevates the engine bay aesthetic while delivering genuine functional reliability.

Features:

• Premium silicone & nylon-reinforced construction – multi-ply hand-crafted hoses deliver superior heat resistance, pressure handling, and long-term durability compared to factory rubber alternatives
• 3-ply 4.5mm wall thickness – overbuilt construction ensures structural strength and resistance to deformation under sustained crankcase pressure cycling
• Direct factory replacement design – manufactured to exacting OE dimensional specifications for clean, modification-free installation
• Wide color selection – available in matte black, gloss black, blue, red, green, white, yellow, pink, purple, grey, and orange to match any engine bay aesthetic
• Extreme temperature tolerance – rated for -60°C (-76°F) to +260°C (+500°F) operation, far exceeding factory rubber breather hose limits
• High pressure handling – 245 PSI bursting pressure rating with 0.3-0.9 MPa working pressure range provides significant safety margin over factory specifications
• Permanent vacuum leak fix – addresses the recurring crankcase ventilation failures that plague aged 1.8T engines

Specifications:

• Condition: 100% Brand New
• Type: Crankcase Breather Hose Kit
• Material: Premium Silicone with Nylon Reinforcement
• Construction: 3-Ply (4.5mm) / 4-Ply (5.4mm) Multi-Ply
• Wall Thickness: 4.5mm (3-Ply Standard)
• Bursting Pressure: 245 PSI
• Working Pressure: 0.3 – 0.9 MPa
• Temperature Range: -60°C to +260°C (-76°F to +500°F)
• Size Tolerance: ±0.5 mm
• Quantity: 5 hoses per set
• Available Colors: Matte Black / Black / Blue / Red / Green / White / Yellow / Pink / Purple / Grey / Orange
• Position: Crankcase Ventilation System
• Purpose: Performance Upgrade / OE Replacement / Vacuum Leak Repair

OE / Replacement Part Numbers:

• 06A 103 213 F / 06A103213F
• 06A 103 221 AF / 06A103221AF
• 06A 103 221 AH / 06A103221AH
• 06A 103 247 / 06A103247
• 035 103 245 G / 035103245G
• 035 103 245 A / 035103245A

Fitment:

• VW Golf MK4 1.8T: AUM / AUQ engines (1998 – 2006)
• VW Jetta MK4 1.8T: AUM / AUQ engines (1999 – 2005)
• VW Bora 1.8T: AUM / AUQ engines (1999 – 2005)
• Audi A3 8L 1.8T: AUM / AUQ / ARX / ARY engines (2001 – 2003)
• Compatible with 1.8T AUM / AUQ / ARX / ARY engine codes only – not compatible with 2.0L, 1.6L, 1.9 TDI, or other engine variants
• Confirm vehicle model, engine code, and factory breather hose part numbers before ordering

Contents:

• 5x Silicone Crankcase Breather Hoses (Complete Set)

Benefits:

• Silicone construction permanently eliminates the cracking, hardening, and vacuum leak failures that plague factory rubber breather hoses on aged 1.8T engines after 15+ years of underhood heat exposure
• Resolves persistent rough idle, vacuum leak codes (P0171 lean fault), oil consumption, and oil weeping issues associated with failed factory PCV breather hoses
• Higher pressure rating (245 PSI bursting pressure) provides significant safety margin for crankcase pressure cycling under all driving conditions
• Wide temperature tolerance (-60°C to +260°C) maintains hose integrity in extreme cold starts, prolonged hot-climate driving, and sustained high-load operation
• Multi-ply nylon-reinforced construction prevents hose collapse under crankcase vacuum cycling – a common failure mode of aged single-ply rubber hoses
• Long-term durability eliminates the recurring expense and downtime of repeated breather hose replacement service intervals
• Significant engine bay aesthetic upgrade – wide color selection allows engine bay theming to match your vehicle's exterior or build aesthetic
• Significant cost savings compared to genuine VAG dealer rubber hoses, with substantially better long-term performance and durability

Installation Notes:

• Allow the engine to fully cool before beginning hose replacement to avoid burns from hot engine components
• Note the original routing and orientation of each factory breather hose during removal – take photos before disassembly to ensure correct reassembly
• Inspect the PCV valve, breather assembly, and intake manifold connections during installation – replace any aged or damaged components to ensure long-term leak-free operation
• Use stainless steel T-bolt or worm-drive hose clamps appropriate for silicone hose – silicone requires properly sized clamps to seal effectively
• Ensure all connections are fully seated and clamped before starting the engine – improperly seated breather connections will cause vacuum leaks and rough running
• After installation, scan for stored fault codes and clear any historical vacuum leak codes (commonly P0171, P2187, or P0507) related to the previous failed breather hoses
• Test for vacuum leaks using a smoke test or carb cleaner spray method to verify proper sealing across all connections
• Installation instructions are not included with the kit – professional installation is recommended unless you are familiar with VAG 1.8T crankcase ventilation system service procedures
• If unsure about compatibility with your specific VW or Audi variant, contact our team with your year, model, and engine code (AUM / AUQ / ARX / ARY) before ordering

Warranty:

• 12-month standard warranty from date of purchase
• Contact our support team for assistance with any issues