BMW 4 Series Diesel Particulate Filter DPF F32 / F33 / F36 (2013-2020)

The Diesel Particulate Filter (DPF) on the BMW 4 Series models F32 (Coupe), F33 (Convertible), and F36 (Gran Coupe) is a crucial emissions control device that captures soot particles from diesel engine exhaust gases to reduce harmful emissions. It is installed on diesel engines such as B37, B47, and N57.

The DPF applies to BMW 4 Series LCI models F32, F33, and F36 equipped with diesel engines B37, B47, and N57. It also relates to other related BMW series models with these engines. Notably, some petrol engines or gasoline models, such as the B58 petrol engine in the 440i xDrive, do not use DPFs.

• Example engines include B47D20A (2.0 TD) for 420d models producing 140-190 hp.
• N57D30T1 (3.0L) engine powering the 435d xDrive with 313 hp also uses a DPF.

Always verify compatibility via VIN or chassis number when ordering parts.

The DPF system collects soot particles from the exhaust to reduce emissions. It has two key functions:

• Passive Regeneration: Occurs during normal driving conditions, where soot is burned off at high exhaust temperatures.
• Active Regeneration: Initiated by the vehicle's ECU to burn accumulated soot when sensor data indicates excessive blockage.

Key components include the Diesel Particulate Sensor (DPS), which measures soot levels electrically and sends signals to the vehicle’s Digital Diesel Electronics (DDE) system for management.

Common symptoms include:

• Engine ECU error codes related to emissions or DPF sensor faults.
• Illumination of the emissions or DPF warning light on the dashboard.
• Reduced engine performance or increased fuel consumption.

Failure to address these can lead to severe clogging, impacting vehicle operation and warranty coverage.

DPF regeneration is usually automated by the vehicle’s ECU during driving. Manual regeneration may be possible through diagnostic tools that can trigger active regeneration cycles. However, cleaning or replacing DPF components should be performed by qualified professionals to avoid damage and maintain system integrity.

Short trips or urban driving can prevent effective passive regeneration causing premature clogging.

Replacement should involve genuine, high-quality DPF parts manufactured to OEM or superior standards. Krosfou offers new stainless steel DPFs with a 3-year warranty for BMW diesel models, complying with European regulations and certified by TÜV SÜD.

Important points:

• DPF replacement often requires replacing upstream and downstream catalytic converters if present.
• Installation must follow manufacturer instructions including replacement of gaskets, sensors, and injectors.
• Vehicles must not be driven only on short trips to ensure proper DPF function.
• Warranty is voided if damage results from negligence or improper use, including clogged DPF.

In most cases, the DPF is integrated into the exhaust system and may require partial disassembly of the exhaust piping to access and remove the filter unit. Professional garages use specific tools and procedures for safe removal and replacement.

Consult your technician or workshop specialized in BMW exhaust systems for advice.

Resetting or registering the DPF via diagnostic tools may temporarily clear error codes or adapt the system settings, but it does not fix physical clogging or damage. If the DPF is blocked or faulty, replacement or professional cleaning is necessary.

• Resetting is a diagnostic step, not a permanent solution.
• Ignoring actual DPF problems can cause engine damage or emissions non-compliance.

Always diagnose thoroughly before deciding on resets or replacements.