Volkswagen Sharan Diesel Particulate Filter DPF

The Diesel Particulate Filter (DPF) on Volkswagen Sharan diesel models is a mandatory emission control device on Euro 5 and later engines. It works by trapping soot particles from exhaust gases to significantly reduce fine particle emissions. It is mainly fitted on Sharan 2nd generation (7N1/7N2, 2000-2010) and 3rd generation models equipped with 2.0 TDI engines.

Volkswagen Sharan diesel models with DPF include:

• Sharan 7N 2.0 TDI 140 HP (103 kW), engine code CFFB, Euro 5 compliant, with cordierite ceramic material.
• Sharan 7N1/7N2 2.0 TDI 140 HP, compatible with multiple supplier parts.
• Sharan 2.0 TDI (7M9), 140 HP / 103 kW, engine code BRT, produced 2005-2010.
• Sharan 2.0 TDI SCR BMT 115 HP with SCR (AdBlue) system for NOx reduction alongside the DPF, Euro 6 compliant (post-2010).

Typical DPF dimensions: approximately 6.2 kg weight and 710 mm length. New parts do not require core returns.

Common signs of a clogged DPF (soot load exceeding 40-50 grams) include:

• Dashboard warning lights for engine, DPF, or anti-pollution systems illuminating.
• Reduced engine power due to blocked exhaust gases, especially noticeable with acceleration.
• Failure of automatic or forced regeneration to clear the soot build-up.
• Excessive smoke emissions or total engine blockage requiring urgent repair or DPF replacement.

The DPF regenerates by burning accumulated soot to keep the filter operable:

• Automatic regeneration: Initiated naturally when soot load reaches around 40-50 grams during driving.
• Forced regeneration: Triggered via diagnostic tools with modes such as "Maintenance regeneration while driving."
• Chemical cleaning: Application of specialized cleaning products (e.g., Cody Mille) injected into the system followed by engine idling and slight acceleration to remove soot and residues.

Preventive measures include using additives like Eco-10000 yearly and C99 regularly to maintain injection and DPF cleanliness, especially in areas with poor fuel quality.

Depending on the soot level and condition:

• Cleaning: Suited for soot levels below 50 grams; involves chemical treatments plus forced regeneration.
• Replacement: New DPF units compliant with Euro standards are available for direct replacement.
• Removal or deactivation: Not legally recommended in Europe due to increased pollution and legal consequences.

Diagnostic tools like OBD scanners help assess soot load, pressure differentials, and detect sensor issues.

To determine if the DPF or SCR is clogged, check for the following using OBD diagnostic tools and sensor data:

• Warning light codes and descriptions on the dashboard.
• Pressure differentials across the DPF from differential pressure sensors.
• Soot load values reported by the control unit.
• AdBlue (urea) injection system faults affecting SCR functionality.

Troubleshooting should start by addressing the root cause to ensure proper regeneration and prevent recurring clogs.

Accessing the DPF typically involves:

• Removing protective shields or underbody panels beneath the vehicle.
• Disconnecting sensors and hoses connected to the DPF and exhaust system.
• Unfastening clamps and mounting brackets securing the DPF.

Hoses related to differential pressure and temperature sensors usually connect directly to the DPF and must be carefully handled during removal or inspection.

Owning a TDI diesel vehicle with a DPF and SCR involves some considerations:

• DPF replacement costs typically range from 1000 to 2000 euros including parts and labor.
• Preventive maintenance like periodic cleaning and additive use can extend DPF life and reduce costs.
• The SCR system requires AdBlue fluid refills and associated maintenance to keep NOx emissions compliant.
• Regular diagnostics and addressing warning lights promptly help avoid expensive repairs.

Proper driving habits, such as longer drives at operating temperature, aid in natural regeneration and system longevity.