T4 Transporter Catalytic Converter - 1996-03 (AAC,ACU,AEU,AET,APL,AVT Engines)

This replacement catalytic converter with exhaust middle pipe is designed for Volkswagen T4 Transporter petrol models, covering both short wheelbase (SWB) and long wheelbase (LWB) vans. Manufactured as a good quality reproduction by Ernst—an OEM supplier to Volkswagen—this unit delivers reliable emissions control, correct exhaust flow, and long service life.

Rated for Euro 1 and Euro 2 applications, it’s an ideal solution when replacing a corroded, blocked, or failed original catalytic converter.

What this part does

The catalytic converter reduces harmful exhaust emissions by converting pollutants such as carbon monoxide, hydrocarbons, and nitrogen oxides into less harmful gases before they exit the tailpipe. Integrated into the exhaust middle pipe, it also helps maintain proper exhaust backpressure, which is essential for smooth engine performance and fuel efficiency.

How it works

As exhaust gases pass through the catalyst substrate, precious metal coatings trigger chemical reactions that neutralise pollutants. The middle-pipe design ensures a smooth transition of exhaust flow between the front pipe and rear silencer, minimising turbulence and maintaining factory-style performance and noise levels.

Key features

• Exhaust middle pipe with integrated catalytic converter

• Suitable for 2.0 & 2.5 petrol T4 engines

• Euro 1 / Euro 2 compliant

• Good quality reproduction by Ernst (OEM supplier)

• Designed for SWB and LWB models

• Durable construction for long-term reliability

Engine compatibility

• AAC – 2.0 Petrol: 01/1996 – 06/2003

• AAF – 2.5 Petrol: 08/1992 – 12/1995

• ACU – 2.5 Petrol: 01/1996 – 10/1996

• AEU – 2.5 Petrol: 08/1996 – 06/2003

• AET – 2.5 Petrol: 08/1996 – 06/2003

• APL – 2.5 Petrol: 05/1999 – 12/1999

• AVT – 2.5 Petrol: 12/1999 – 06/2003

Vehicle applications

• VW T4 Transporter: 1992–2003

  • Petrol models

  • Short wheelbase & long wheelbase

Fitting notes

• Always check engine code and exhaust layout before ordering

• Recommended to fit new exhaust gaskets and clamps during installation

• Inspect lambda sensors and surrounding exhaust sections while replacing the catalytic converter

This catalytic converter and middle pipe assembly is an essential component for keeping your VW T4 petrol Transporter running cleanly, efficiently, and within emissions limits—without compromising on durability or fit.