Audi TT Diesel Particulate Filter DPF

The Diesel Particulate Filter (DPF) on an Audi TT, mainly diesel models like the 2.0 TDi, is an essential pollution control device mandated since 2011. Positioned after the catalytic converter and before the silencer, it captures up to 99% of fine particles (soot and ashes) from exhaust gases to reduce pollution and carcinogenic risks.

It consists of a ceramic body (often cordierite or silicon carbide) shaped as a honeycomb with about 50 microchannels per cm² encased in stainless steel. Exhaust gases are forced through porous walls trapping soot particles.

The DPF regenerates in two main ways to burn off accumulated soot:

• Passive regeneration : Occurs during high load driving (e.g., highway above 3000 rpm) when exhaust temperature is sufficient to combust soot, usually every 500-700 km over 5-15 minutes.
• Active regeneration : Triggered by the engine control unit via a pressure sensor when the filter is clogged. It disables the EGR valve, activates post-injection and turbo to heat exhaust gases above 600°C to convert soot to CO2, water, and non-burnable ash.

Some diesel DPFs use additives like cerine to lower combustion temperature by 100°C for low load regeneration. Euro 6 models may also integrate AdBlue technology for additional NOx reduction. Petrol Audi TT models use Gasoline Particulate Filters (GPF) with higher temperatures enabling near real-time regeneration.

A defective or blocked DPF typically causes:

• Loss of engine power due to increased back pressure.
• Higher fuel consumption.
• Illumination of the engine warning light indicating pressure issues.
• Failed forced regeneration cycles.

These symptoms suggest it is time to check or service your DPF to avoid engine damage.

Proper maintenance tips for your Audi TT's DPF include:

• Drive at least once a month at speeds and engine loads that raise RPM above 3000 rpm, such as highway driving, to enable passive regeneration.
• Avoid frequent short urban trips which prevent complete regeneration and cause soot buildup.
• Use good quality diesel fuel with recommended additives that aid combustion and reduce deposits.
• Regular inspection and cleaning of the EGR valve to maintain exhaust flow.
• Professional decarbonisation services periodically to prolong the DPF lifespan.

Cleaning and repairing your Audi TT DPF can be done through various methods:

• Chemical cleaning : Adding DPF cleaner fluid into the fuel tank to dissolve soot deposits, or removing the DPF for a professional chemical bath cleaning.
• Manual regeneration : Using diagnostic tools to force active regeneration cycles.
• Replacement : If cleaning is insufficient, replacing the DPF with a new high-quality unit from a trusted manufacturer is recommended, with prices typically ranging from £1000 to £2500 based on the model.
• Note : Aftermarket options like racing downpipes that remove the DPF exist but are illegal and void vehicle environmental compliance.

Always seek professional advice and fitting for maintenance or replacement to ensure optimal function and legal compliance.

Audi TT diesel variants feature several types of DPF technologies:

• Standard DPFs without additives that rely on regeneration heat.
• DPFs with cerine-based additive systems that reduce regeneration temperature.
• Euro 6 compliant DPFs integrated with AdBlue (SCR) systems to also reduce nitrogen oxides (NOx).
• Variants combining DPF and catalytic converter technology downstream of the turbocharger.

The specific DPF type depends on the engine variant, manufacturing year, and emission standard compliance of your Audi TT.

Yes, by providing your vehicle identification number (VIN), specialists or parts suppliers can accurately check your Audi TT’s engine, transmission, and exhaust system specifications to confirm the correct DPF model and sensors required for your vehicle.

This ensures proper fitment and function, avoiding errors in selection and installation.

We offer brand-new, high-performance DPFs and catalytic converters for Audi TT models manufactured with premium ceramics and stainless steel INOX 409. These products are TÜV SÜD certified, matching or exceeding original equipment standards, and come with a 3-year warranty valid for up to 100,000 km.

• Produced with superior technology for durability and optimal performance.
• Full compliance with European regulations and emissions standards.
• Professional support available to assist with product selection based on your engine and vehicle generation.

Choosing quality, certified parts helps protect your engine, maintain emissions compliance, and preserve the environment.

Contact us or browse our professional catalog online for more details.