VW Transporter T5.1 Air Filter Box Intake Pipe 7H0129578B

#123

Genuine used Volkswagen Transporter T5 / T5.1 air filter box intake pipe / fresh air intake hose, part number 7H0129578B. This pipe forms part of the engine air-intake system and directs outside air towards the air filter housing before the air is filtered and supplied to the engine.

Part Number: 7H0129578B

VW OE Number: 7H0 129 578 B

Part Type: Air Filter Intake Pipe / Intake Hose / Fresh Air Duct

Position: Engine Bay – Air Filter System

Material: Moulded Plastic

Manufacturer: Volkswagen / VAG

Condition: Genuine used part

Compatibility

Suitable for selected:

* Volkswagen Transporter T5 – 2003–2009

* Volkswagen Transporter T5.1 – 2010–2015

* Volkswagen Caravelle T5 / T5.1

* Volkswagen Multivan T5 / T5.1

* Volkswagen California T5 / T5.1

* Panel van, Kombi and passenger variants using the matching intake system

Known applications of 7H0129578B include selected:

1.9 TDI

* AXC – 85 PS

* AXB – 105 PS

* BRR – 84 PS

2.0 TDI

* CAAA – 84 PS

* CAAB – 102 PS

* CAAD – 114 PS

* CAAE – 136 PS

* CAAC – 140 PS

* CCHB / CCHA – selected applications

* CFCA – 180 PS BiTDI

2.5 TDI

* AXD – 130 PS

* BNZ – 131 PS

* BLJ – 163 PS

* AXE – 174 PS

* BPC – 174 PS

Selected petrol applications can also use this OE intake duct.

Because VW used different air-filter arrangements according to engine and production specification, the OE number should still be matched before purchase.

Technical Information

This pipe is located on the clean-air intake supply side associated with the air-filter housing and forms part of the engine’s air-induction system.

Its function is to:

* Direct fresh outside air towards the air-filter housing

* Maintain the intended intake-air path

* Protect the intake system from drawing excessive hot engine-bay air

* Provide a correctly sized unrestricted airflow path

* Connect the factory intake ducting with the air-cleaner assembly

* Maintain the original engine-bay intake configuration

After entering through this duct, air passes through the engine air filter before continuing through the relevant intake components towards the engine.

Air Intake System Information

The air-intake system works as a complete assembly.

Depending on engine specification, related components can include:

* Fresh-air intake duct

* Air-filter housing

* Air-filter element

* Mass Air Flow (MAF) sensor

* Intake hoses

* Turbocharger inlet pipe on TDI models

* Turbocharger

* Intercooler and boost pipework

* Intake manifold

7H0129578B is an intake-side air duct and should not be confused with a turbo/intercooler boost-pressure hose.

Common Reasons for Replacement

Typical reasons for replacing this pipe include:

* Cracked plastic

* Split intake duct

* Broken mounting points

* Damaged connection ends

* Missing original pipe

* Previous accident damage

* Damage during air-filter removal

* Pipe becoming brittle with age

* Incorrect aftermarket intake modification

* Loose or poorly fitting intake connection

Symptoms of a Damaged Intake Pipe

Depending on where the damage is located, possible symptoms can include:

* Increased intake noise

* Rattling from the engine bay

* Loose intake ducting

* Engine drawing warmer engine-bay air

* Reduced protection of the intended intake path

* Visible cracks or broken mounting points

Because this duct is associated with the air-filter intake system, symptoms can be considerably less dramatic than those caused by a split pressurised turbo/intercooler hose.

Important Diagnostic Information

If the vehicle has poor performance or an airflow-related fault code, do not automatically assume this intake pipe is responsible.

Also inspect:

* Air filter

* Air-filter housing

* MAF sensor

* Turbo inlet hose

* Vacuum system

* Turbocharger

* Intercooler

* Boost hoses

* MAP sensor

* Intake manifold

A boost leak after the turbocharger can cause significant loss of power but is a different fault from damage to this fresh-air intake duct.

Inspection Before Installation

Before fitting a used intake pipe, inspect:

* Pipe body for cracks

* Connection ends

* Mounting tabs

* Retaining points

* Plastic for excessive brittleness

* Internal passage for foreign objects

* Mating air-filter components

Any leaves, dirt or storage debris should be removed before installation.

Installation

Installation is normally straightforward and does not require specialist programming.

During fitting:

* Remove the damaged intake duct

* Inspect the air-filter housing

* Check all mating connections

* Position the replacement pipe correctly

* Engage mounting tabs/retainers

* Ensure connections are fully seated

* Check that the pipe does not contact moving or excessively hot components

After installation, confirm that the intake duct is secure and cannot move excessively.

Programming / Coding

No programming or coding is required.

This is a mechanical air-intake component.

Important Compatibility Note

Please compare before ordering:

* OE number – 7H0129578B

* Pipe shape

* Connection diameter

* Mounting points

* Air-filter housing design

* Engine code

* Vehicle production date

* Existing intake-system configuration

The same 7H0129578B reference is catalogued across a broad range of T5/T5.1 engine applications, but it should not be assumed to fit every Transporter solely from the model or engine size.

Matching the OE number against the original pipe is the safest method.

Condition

Genuine Volkswagen used engine-bay component.

As a used plastic intake component, the item may show normal signs of previous use, including:

* Surface scratches

* Dust or dirt

* Light cosmetic marks

* General age-related wear

Please inspect all listing photographs carefully for the exact condition of the pipe body, mounting tabs and connection points.

Any identifying colour/security markings applied to the part must remain intact in the event of a return.

Ideal genuine replacement for a cracked, broken, damaged or missing Volkswagen Transporter T5 / T5.1 air-filter intake pipe, provided 7H0129578B matches the original component.