This ECU FAP EAS300.01 by Magneti Marelli is a dedicated control unit designed to manage DPF-related functions and injection parameters on selected Citroën and Peugeot diesel models. It coordinates particulate filter regeneration requests, monitors soot load signals, and communicates with engine management systems to optimise combustion and reduce emissions. The unit is commonly referenced by OEM part numbers and is often searched for by its product codes—making it an ideal replacement part for professional workshops and experienced DIY mechanics.

The module is compatible with a range of Stellantis diesel vehicles, including Citroën C5 and C8 and Peugeot 307 and 807 (verify fitment by part number). Symptoms of a failing DPF control unit include persistent DPF warning lights, inability to start the forced regeneration, irregular exhaust behaviour, and stored fault codes related to soot sensors or DPF control. Because this component directly affects regeneration logic and injection timing adjustments related to soot management, replacing a faulty unit typically restores correct DPF operation when other related components (sensors, wiring, DPF itself) are functional.

Technical information

• Manufacturer: Magneti Marelli
• Model: ECU FAP EAS300.01
• Product Codes: 9647428280-01, 09733309901
• Other Numbers: 9733309901, 1525CY, EAS300.01
• Applicable Vehicles: Citroën C5, Citroën C8, Peugeot 307, Peugeot 807 (common applications)

Installation recommendations

Before starting work, disconnect the vehicle battery to avoid electrical damage. Locate the DPF control ECU—typically in the engine bay or close to the main engine ECU depending on the model. Remove any protective covers and unplug all connectors carefully, releasing locking tabs to prevent connector damage. Replace the unit using the original mounting hardware and ensure connector pins are clean and fully seated. After installation, clear fault codes with a compatible diagnostic tool and run a system check; perform a forced regeneration or adaptation procedure if required by the vehicle’s service routine. Use anti-seize or dielectric grease on connectors if corrosion was present to improve long-term reliability.

Why this part commonly fails

DPF control units are exposed to thermal cycling, vibration, and potentially contaminated signals from soot sensors. Common causes of failure include connector corrosion, water ingress, thermal stress, and electrical surges. In many cases, the root cause is related to sensor faults or heavy soot/clogging in the DPF system that force the ECU to operate at limits; addressing only the ECU without checking sensors and the DPF itself may result in recurring faults. Regular inspection of wiring, sensor condition, and ensuring the DPF can regenerate properly will reduce premature ECU failures.

Note: This part is frequently searched by its part numbers (e.g., 9647428280-01, 09733309901). Always compare part numbers to confirm fitment before ordering.

This Magneti Marelli ECU (EAS300.01) is designed to manage injection timing and DPF regeneration for a range of Citroën and Peugeot diesel models. Ideal for professional workshops and experienced DIY mechanics, the unit is commonly searched by its product codes (e.g. 9647428280, 09733309901, 1525CY). It restores proper diesel particulate filter control, helps eliminate fault codes related to FAP/DPF systems and ensures reliable communication with engine sensors for correct regeneration cycles. Supplied for vehicles where this ECU is specified, it is a direct-fit electronic control unit intended to replace a failed or malfunctioning injection/DPF controller.

Technical Information

• Manufacturer: Magneti Marelli
• Model: EAS300.01
• Product Codes: 9647428280, 9647428280-01, 09733309901, 9733309901, 1525CY, 09733309901
• Other Numbers: EAS300.01, 1525CY NFP

Applications

Typical vehicle fitments: Citroën C5, Citroën C8, Peugeot 307, Peugeot 807. Verify the unit part number against the original ECU label before installation.

Function and Overview

This control unit manages fuel injection parameters and oversees DPF regeneration logic. It receives inputs from sensors (engine speed, temperature, pressure, differential pressure across the DPF, etc.), calculates regeneration needs and coordinates injector timing and regeneration strategies. When operating correctly it reduces soot accumulation, controls emissions, and prevents limp-home modes caused by uncontrolled DPF conditions.

How Replacement Is Performed

Replacement should be performed by a qualified technician or an experienced DIY mechanic with basic electrical knowledge. General procedure:

• Disconnect the negative battery terminal before any work.
• Access the ECU location (engine bay or cabin mounting depends on model) and remove any protective covers.
• Carefully unplug electrical connectors and remove mounting fasteners.
• Fit the replacement unit, secure fasteners and reconnect all connectors.
• Perform required initialization/coding as described below to restore full functionality.

Installation Recommendations

Always follow manufacturer removal and installation procedures. Avoid excessive force when disconnecting connectors and protect the unit from moisture and contamination during installation. If possible, perform coding and final checks using PSA diagnostic equipment to ensure proper integration with vehicle systems.

Installation and Coding – Important

• The unit is used and is paired with the original vehicle (VIN/PIN/keys).
• Options to activate the unit:
  1. Cloning data from the old unit (EEPROM/Flash) – after cloning the unit is plug and play.
  2. Virginization and subsequent initialization/telecoding via DiagBox (or online) + key adaptation.
• Recommended to be performed by a specialist with PSA service equipment (DiagBox/Lexia/PP2000).
• Always disconnect the battery before removal/installation and follow the manufacturer’s procedure to avoid damaging the unit.

Why This Part Fails Most Often

Common causes of ECU failure include water ingress or corrosion at connectors, thermal stress from prolonged exposure to high underhood temperatures, electrical surges or poor battery/charging system condition, and damage from improper handling. Secondary factors can be repeated DPF regeneration faults or faulty sensors that place extra load on the control unit. Regular inspection of wiring, connector integrity and the charging system can reduce the risk of premature ECU failure.

Notes for Buyers

Search the unit by listed product codes (9647428280, 09733309901, 1525CY, EAS300.01) for quick identification. Compatible with the vehicle models listed above when the OEM part number matches. Proper post-installation coding or cloning is essential for full functionality.

This Magneti Marelli ECU is designed to manage injection-related functions linked to the Diesel Particulate Filter (FAP/DPF) on selected Citroën and Peugeot models. Ideal for professional workshops and competent DIY mechanics, the unit restores proper DPF regeneration control and injector/timing-related management when the original control module is faulty. Supplied with multiple common part numbers, it fits a range of models where the EAS300.01 / 9647428280 family is specified.

Key Benefits

– Restores reliable DPF regeneration and related injection control logic
– Compatible with known PSA electrical/engine management architectures using EAS300.01 hardware
– Useful replacement for fault codes related to DPF control, excessive soot accumulation, or ECU electronic failure

How It Works

The ECU monitors sensors (engine speed, temperature, differential pressure across the DPF, lambda/O2 signals and other engine sensors) and controls injection timing and post-injection events required for forced or passive DPF regeneration. By adjusting injection parameters and communicating with the vehicle network, the unit helps clear soot from the filter when required and manages related engine functions.

Compatibility And Application

Frequently fitted to Citroën and Peugeot diesel models using Magneti Marelli EAS300.01 control hardware. Known compatible vehicle examples (verify against part numbers): Citroën C5, Peugeot 307. Always match the part numbers below to the vehicle’s original ECU marking before installation.

Technical Information

• Manufacturer: Magneti Marelli
• Model: EAS300.01 (Control Unit). Compatible Vehicle Models: Citroën C5; Peugeot 307
• Product Codes: 9647428280, 9647428280-01
• Other Numbers: 9733309901, 09733309901, 1525CY, 09733309901, EAS300.01

Installation Recommendations

– Always disconnect the battery before removal and installation to prevent damage to the electronics.
– Observe anti-static precautions and avoid touching exposed board components or pins.
– Ensure all connectors and pins are clean and corrosion-free; secure the ECU in its mounting bracket in the original orientation.
– After mechanical fitment, perform required software initialization/coding where applicable so the unit communicates correctly with other vehicle systems.

Installation and Coding – Important

• The unit is used and is “paired” with the original vehicle (VIN/PIN/keys).
• Options to put the unit into service:
  1. Cloning data from the old unit (EEPROM/Flash) – after cloning the unit is plug and play.
  2. Virginization and subsequent initialization/telecoding via DiagBox (or online) + key adaptation.
• Recommended to be performed by a technician with PSA service equipment (DiagBox/Lexia/PP2000).
• Always disconnect the battery before disassembly/assembly and follow the manufacturer procedure to avoid damaging the unit.

Why This Part Fails Most Often

Common causes of ECU failure include water ingress or moisture in the connector area, thermal stress from prolonged high under-hood temperatures, connector corrosion, or internal electronic component faults. Secondary effects such as a severely blocked DPF, repeated failed regeneration cycles, or faults in sensors/actuators (differential pressure sensor, EGR, injectors) can increase load on the ECU and contribute to failure.

Replacement And Practical Tips

When replacing the ECU, confirm the external part numbers match and inspect the DPF system and related sensors. If the DPF is heavily clogged, address the filter and sensor faults before installing the replacement ECU to avoid reoccurrence of error codes or premature failure. After installation follow the coding/initialization steps to ensure full functionality.

Notes For Mechanics

Keep the ECU’s part numbers handy during diagnostics and parts ordering: technicians often search by the item number (9647428280 / 9647428280-01 / 9733309901 / 1525CY). Proper diagnosis of DPF-related faults typically includes scanning for stored fault codes, checking sensor signals, and verifying regeneration events.

Looking for a reliable solution to restore the function of your diesel particulate filter (FAP) control unit in your Citroën or Peugeot? This quality used Magneti Marelli control unit, originally intended for Citroën and Peugeot models, is a perfect choice for professional mechanics and DIY enthusiasts who want to maintain their vehicles in optimal condition without the high cost of new parts.

The FAP ECU plays a crucial role in reducing particulate emissions from diesel engines by regulating the combustion process and ensuring efficient filtration. Common causes of failure include prolonged operation under demanding conditions, resulting in wear of electronic components or software degradation. Replacing this unit is essential to maintain environmental compliance and proper vehicle function.

Technical Information:

Manufacturer: Magneti Marelli
Model: Citroën, Peugeot
Product Codes: 9647428280-00, 09733309900
Additional Codes: 1525CY

Obtain this quality used control unit and ensure that your Citroën or Peugeot receives the best care at a fraction of the price of new parts. Reference to product numbers guarantees compatibility with your specific vehicle model. Do not miss the opportunity to acquire this essential automotive component!