Volkswagen Multivan Catalytic Converter T4 (1990-2003)

The catalytic converter for the Volkswagen Multivan T4 is an essential exhaust system component designed mainly for diesel engines manufactured between 1995 and 2003. It reduces harmful emissions such as NOx, CO, and particulates to help meet Euro 3 standards and is compatible with various engines including 1.9 D/TD/TDI, 2.4 D/TD, and 2.5 TDI. Available in original and aftermarket types, it typically weighs between 3.8 and 6.4 kg and measures around 1140 mm in length.

This catalytic converter fits various versions of the Multivan T4 with short and long chassis including the Syncro 4x4. Compatible engines include:

• 1.9 D/TD/TDI diesel engines from 1995 to 2003
• 2.4 D/TD diesel engines from 1995 to 2003
• 2.5 TDI diesel engines from 1996 to 2003 (except ACV engines after 300,000 km)
• 2.5 petrol engines (e.g. AET engine, 85 kW)

Applicable to Transporter T4, Caravelle, California, and Multivan variants.

There are several main Volkswagen original equipment manufacturer (OEM) references depending on engine type:

• For 2.5 TDI engines: 028131089AX, 028131089EX, 028131089F, and many others
• For 1.9/2.4 Diesel engines: 028253409H, 028253409C, 074253409A, among others
• Generic reference example: BM80025

These references help to ensure the correct match for your vehicle's engine and model year.

Yes, many approved aftermarket catalytic converters comply with E-Mark and Euro 3 standards and are designed to match original specifications. Some brands provide references such as BM80025H, 37900D, 311456, and more, offering quality alternatives typically made from stainless steel with durable honeycomb monoliths.

Choosing a reputable aftermarket catalytic converter ensures quality, performance, and emission compliance similar to original parts.

The main technical features include:

• Weight ranging from 3.8 kg up to 6.4 kg depending on version
• Approximate length around 1140 mm
• Manufactured generally in stainless steel (INOX 409 recommended for quality)
• Designed to reduce exhaust emissions and ensure compliance with emission regulations

Installation should be done by a qualified mechanic to ensure proper fit and emission system performance.

The catalytic converter is typically positioned along the exhaust pipe between the engine and the muffler. On the Multivan T4, it is located after the exhaust manifold and before the silencer, integrated into the main exhaust pipe to treat exhaust gases effectively before they exit the vehicle.

This positioning allows the catalytic converter to reduce harmful emissions from diesel or petrol combustion, improving air quality and complying with legal vehicle emission limits.

To ensure your catalytic converter fits perfectly and performs correctly, verify the following:

• Vehicle model and year (mainly 1995-2003 for T4)
• Engine type and capacity (e.g., 1.9 D/TD/TDI, 2.4 D/TD, 2.5 TDI, petrol 2.5 L)
• Engine code or reference number to cross-check compatible OEM or aftermarket parts
• Check if the engine is ACV type post 300,000 km as some converters may not fit
• Compatibility with chassis type: short, long, or Syncro 4x4

Consult your mechanic or use VIN-based compatibility services for precise match. Choosing the correct reference avoids fitment issues and costly returns.

Installation and upkeep advice includes:

• Have the catalytic converter fitted by a qualified mechanic to ensure correct installation and sensor alignment
• Regularly inspect the exhaust system for damage, leaks or corrosion, especially around the catalytic converter pipe
• Monitor engine condition and perform timely maintenance to avoid catalytic converter clogging or failure
• Use quality fuel (diesel or petrol depending on engine) to reduce harmful residue buildup
• Respect emission inspection schedules required by local country regulations

Finally, replace the catalytic converter if emission failures occur or if damage is evident to ensure your Multivan meets environmental and legal standards without impacting exhaust flow or vehicle performance.

Paying attention to these guidelines helps you save money and extend the life of your vehicle’s emission system components.