Description

This is a genuine BMW Diesel Particulate Filter (DPF) cleaning service for the E90 320d, corresponding to OEM part number 18307812281. We offer a professional, off-vehicle ultrasonic and thermal cleaning process that restores exhaust flow to near-new condition, resolving blockage issues and warning lights.

A DPF is a critical emissions control device fitted to modern diesel vehicles. Its primary function is to trap harmful soot (particulate matter) from the exhaust gas. Over time, this soot is burned off through a process called regeneration. However, if regeneration cycles are incomplete or fail to run, the filter becomes blocked with a mixture of soot and incombustible ash, leading to increased exhaust backpressure, warning lights, and reduced engine performance. Common causes for blockage include frequent short journeys where the engine doesn’t reach optimal temperature, faulty EGR valves, or failing temperature and pressure sensors that prevent regeneration from starting.

At Gap Turbos, our specialised cleaning service is a cost-effective and reliable solution. We first test the blocked unit to measure its initial flow rate. It then undergoes a deep clean in our ultrasonic tank, followed by a controlled thermal cycle in our specialist kiln to bake out remaining deposits. This process removes the stubborn ash that normal regeneration cannot, restoring the filter’s efficiency to over 98% of its original capacity. This is a fully legal and MOT-compliant alternative to DPF removal and is significantly cheaper than a new replacement unit from a main dealer.

What this diesel particulate filter (DPF) fits

This DPF cleaning service is for the standard filter fitted to the BMW 3 Series (E90, E91, E92, E93 chassis) 320d models. Specific compatibility is as follows:

• Model: BMW 320d
• Chassis Code: E90 (and related E91/E92/E93)
• Engine Code: N47D20
• Year Range: 2007 – 2012
• Emissions Class: Euro 5
• OEM Part Number: 18307812281
• Alternative Part Number: BM11041

It is always best practice to physically check the part number on your vehicle’s DPF before booking a service.

All our DPF cleaning services include a post-clean flow report and are covered by our standard warranty. Contact Gap Turbos in Birmingham for a firm quote and to check workshop availability.

Specifications

Vehicle fitment

• BMW 320d E90

Common faults & troubleshooting

• DPF warning light on dashboard: The ECU has detected excessive backpressure, indicating the filter is blocked and requires immediate attention.
• Engine enters “limp mode” with reduced power: This is a protective measure by the ECU to prevent engine damage when DPF blockage becomes critical.
• Poor fuel economy: A blocked filter forces the engine to work harder to expel exhaust gases, leading to increased fuel consumption.
• Stop/Start system not working: The vehicle’s ECU will often disable non-essential functions like the stop/start system when a DPF fault is active.
• Failed emissions test during MOT: A blocked or internally damaged DPF will not filter particulates effectively, resulting in an immediate MOT failure.

Fitting notes for this unit

• Reset Adaptations: After refitting, you must use a diagnostic tool to reset the DPF values in the ECU. Failure to do this will mean the car still thinks the old, blocked filter is installed.
• Replace Seals: Always use new flange gaskets and clamp seals during reinstallation. Re-using old, heat-cycled seals will lead to exhaust leaks.
• Handle Sensors with Care: When removing the temperature and pressure sensors, be careful not to damage the threads or wiring. Clean any soot from the sensor tips before refitting.
• Address Root Cause: Before fitting a cleaned DPF, ensure the original cause of failure (e.g., faulty thermostat, EGR valve, leaking injector) has been rectified, otherwise the cleaned filter will quickly block again.
• Perform Forced Regeneration: After installation and adaptation reset, perform a static or dynamic forced regeneration using a diagnostic tool. This confirms that all sensors are reading correctly and the system is functioning properly.

Alternative part numbers

This turbo is also referenced by:

• BM11041 — BMW DPF OE BM11041 (BMW 320d E90, N47D20, Euro 5)

Frequently asked questions