This Magneti Marelli IAW 6LP2.12 engine control unit (ECU) is intended for professional workshops and DIY mechanics servicing Citroën and Peugeot models with the 1.4 16V KFU engine. The unit accepts common OEM product codes used in parts searches (see Technical Information below), making it quick to find by reference number. The ECU manages fuel injection, ignition timing and engine sensors to ensure stable idle, responsive throttle and correct emissions behaviour. Suitable for repairs where the original control unit is faulty, corroded or damaged after electrical faults or water ingress.

Installation Overview

Typical replacement steps: disconnect the vehicle battery; locate the ECU (commonly found in the engine bay or behind the glovebox depending on model); remove trim or covers; unplug wiring connectors and remove securing bolts; fit the replacement unit and reconnect. After mechanical installation, coding or data transfer is often required so the engine runs correctly and the immobiliser functions as expected.

Installation And Coding – Important

• The Unit Is Used And Is “Paired” With The Original Vehicle (VIN/PIN/Keys).
• Options To Commission 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 Carried Out By A Technician With PSA Service Equipment (DiagBox/Lexia/PP2000).
• Always Disconnect The Battery Before Removal/Installation And Follow The Manufacturer Procedure To Avoid Damaging The Unit.

Recommended For Replacement

ECUs usually have a long service life and are replaced only when faults occur (engine misfires, no-start, persistent fault codes, or communication loss on diagnostic tools). Replacement is recommended after confirmed electronic failure, water damage, heat-related faults or irreparable connector corrosion. When possible, have the original unit’s data cloned to the replacement to avoid immobiliser or coding issues.

How It Is Replaced On The Vehicle

• Prepare: Park on level ground, engage handbrake, remove ignition key and disconnect the negative battery terminal.
• Access: Remove necessary trim or panels to reach the ECU location (engine bay or passenger compartment depending on model).
• Disconnect: Carefully release locking tabs on wiring harness connectors; label connectors if needed to avoid mix-up.
• Remove: Unscrew mounting bolts and extract the ECU; inspect connectors and wiring for damage.
• Fit: Mount the replacement unit, secure bolts, reconnect harnesses and reconnect the battery.
• Commissioning: Perform cloning or coding/initialization as required (see Installation And Coding – Important).

Why This Part Fails Most Often

Common causes of ECU failure include water ingress (leaks, flooding), corrosion on connectors, electrical surges from jump-starts or charging system faults, and thermal stress or failed solder joints. Connector damage and poor grounding can also cause intermittent faults that mimic sensor or actuator failures.

Technical Information

• Manufacturer: Magneti Marelli
• Model: IAW 6LP2.12
• Product Codes: 9664339980; 9665936280
• Other Numbers: 16.631.064; 16.988.004; 1940XH; 1940XJ
• Compatible Engines/Models: 1.4 16V KFU Engine; Fits Citroën and Peugeot Vehicles; Removed From Citroën C4 (2009)

Mounting Recommendation

Use correct torque for ECU mounting screws, ensure connectors click fully into place and that connector seals are intact. Protect the unit from moisture and avoid routing high-current wiring near the ECU harness. If the vehicle has experienced electrical faults, inspect the alternator and battery to prevent damage to the new unit.

This Magneti Marelli IAW 6LP2.05 engine control unit (ECU) is intended for petrol 1.4 16V KFU engines used in Citroën and Peugeot models. The unit controls fuel injection, ignition timing and related sensor inputs to ensure correct engine running, emissions and drivability. Supplied as a used replacement taken from a Citroën C4, it is a direct-fit unit for compatible vehicles when matched and prepared correctly.

Key Benefits

• Direct compatibility with 1.4 16V KFU engine installations in Citroën/Peugeot models.
• Original Magneti Marelli hardware designed for factory-level engine management.
• Commonly referenced by OEM part numbers for fast identification (see Technical Information).
• Suitable for professional workshops and experienced DIY mechanics familiar with ECU replacement and coding.

Fitment And Application

Commonly fitted to Citroën C4 and Peugeot 307 models equipped with the 1.4 16V KFU petrol engine. Check the engine type and ECU part number on the original unit before replacement. This unit is frequently searched by product codes such as 9653979480 and 9657429380.

Technical Information

• Manufacturer: Magneti Marelli
• Model: IAW 6LP2.05
• Product Codes: 9653979480, 9657429380
• Other Numbers: 16.631.054, 16.735.044, 1940XH, 1940XJ, NFP

Installation And Coding – Important

– The unit is used and is paired with the original vehicle (VIN/PIN/keys).
– Options for commissioning:
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).
– Before removal/installation always disconnect the battery and follow the manufacturer’s procedure to avoid damaging the unit.

Installation Recommendations

• Always disconnect the vehicle battery before starting work and wait a few minutes to ensure all capacitors are discharged.
• Label and photograph connectors before unplugging to ensure correct reassembly.
• Remove mounting bolts and unplug harness connectors carefully; avoid pulling on wires.
• If the unit requires cloning or coding, perform the procedure with appropriate diagnostic equipment before or immediately after installation according to the chosen method (cloning or virginization).
• After installation, check for wiring harness integrity, clean connector contacts if corroded, and confirm all engine sensors operate correctly via diagnostics.

How Replacement Is Performed (Overview)

• Disconnect negative battery terminal.
• Locate the ECU (usually in engine bay or passenger footwell depending on model).
• Unplug all electrical connectors and remove securing screws or brackets.
• Install the replacement unit, secure mechanically and reconnect harnesses.
• Complete cloning or coding procedure as required (see Installation And Coding – Important).
• Reconnect battery and verify engine starts and runs; clear any fault codes and perform functional checks.

Why This Part Most Commonly Fails

ECUs like the IAW 6LP2.05 are generally durable, but failures typically result from external factors rather than normal wear. The most common causes are water ingress and moisture corrosion at connectors, thermal stress and solder joint cracks from repeated heat cycles, voltage spikes or poor battery/charging system condition, and physical damage or connector corrosion. Symptoms of a failing unit can include no-start, erratic idle, misfires, loss of fuel injection, and multiple engine management fault codes.

Notes For Buyers

Searches for this item are often performed using the OEM product codes (9653979480, 9657429380, 16.631.054, 16.735.044, 1940XH, 1940XJ). Suitable for professional installation or experienced DIY mechanics. Ensure that cloning or coding is planned as required for full functionality after replacement.

This Magneti Marelli IAW 6LP2.05 engine control unit (ECU) is a direct-fit replacement for vehicles equipped with the 1.4 16V KFU petrol engine. Designed for professional workshops and experienced DIY mechanics, the unit manages fuel injection, ignition timing and sensor signals to restore correct engine performance, drivability and emissions control. Commonly searched by part numbers and codes (IAW 6LP2.05, 9653979480, 9659099180, 16.631.054, 16.735.054, 1940XH, 1940XJ), this unit is suitable for Citroën and Peugeot platforms and is especially relevant for Citroën C4 and compatible Peugeot models with the 1.4 16V KFU engine.

Technical Information

• Manufacturer: Magneti Marelli
• Model: IAW 6LP2.05
• Product Codes: 9653979480, 9659099180
• Additional Numbers: 16.631.054, 16.735.054, 1940XH, 1940XJ, NFP
• Fits Engines: 1.4 16V KFU (Petrol)
• Typical Vehicles: Citroën C4; select Peugeot models (e.g. 307) with the 1.4 16V KFU engine

Compatibility And Application

The ECU is intended for vehicles fitted with the 1.4 16V KFU petrol engine. Fitment depends on engine code and electrical connector configuration; exact compatibility is governed by the ECU part and software version. This unit is commonly found on Citroën C4 and some Peugeot models—verify engine code on the vehicle to ensure correct replacement.

Installation

Recommended for professional mechanics or experienced DIY technicians. Basic replacement steps:

• Disconnect the negative terminal of the battery before any work.
• Locate the ECU (position varies by model: engine bay or passenger compartment). Refer to the vehicle repair manual for exact location and access procedure.
• Unplug electrical connectors carefully, release any locking tabs and note connector orientation.
• Remove mounting bolts and extract the old unit.
• Fit the replacement unit, secure mounting bolts to the manufacturer’s torque specification and reconnect all connectors.
• Perform required coding, cloning or initialization (see Installation and Coding section below) before attempting to start the engine.
• After installation, check for fault codes and verify correct engine operation and sensor readings.

Installation And Coding – Important

• The Unit Is Used And Is “Paired” With The Original Vehicle (VIN/PIN/Keys).
• Options For Commissioning:
  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).
• Before Removal/Installation Always Disconnect The Battery And Follow The Manufacturer’s Procedure To Avoid Damaging The Unit.

Why This Part Commonly Fails

• Water Ingress And Corrosion Causing Connector Or Circuit Damage.
• Electrical Surges Or Poor Grounding Leading To Component Failure.
• Internal Solder Joint Cracks Due To Vibration And Thermal Cycling.
• Connector Wear Or Bent Pins Causing Intermittent Signals.
• Age-Related Electronic Component Degradation.

Symptoms Of A Faulty ECU

• Engine Won’t Start Or Cranks Without Ignition.
• Intermittent Stalling, Misfires Or Poor Running.
• Erratic Idle Or Sudden Loss Of Power.
• Persistent Engine Fault Codes Related To Sensors, Fuel Injection Or Ignition.

Replacement Advice

ECUs have no fixed service interval; lifespan depends on operating conditions. If symptoms point to ECU failure, perform a full electrical inspection (battery voltage, grounds, connector condition) and read fault codes before replacement. Where possible, cloning the original unit’s EEPROM/Flash preserves immobilizer and vehicle-specific data and is typically the fastest route to a plug-and-play result. If cloning is not available, virginization and coding with PSA diagnostic tools will be required to bring the unit into service.

Who Should Install

Suitable for professional auto-electricians and competent DIY mechanics comfortable with vehicle electronics and coding procedures. For correct commissioning of used ECUs and secure immobilizer handling, use of PSA diagnostic equipment and trained personnel is strongly recommended.

Keywords For Search

IAW 6LP2.05, Magneti Marelli ECU, Engine Control Unit, 9653979480, 9659099180, Citroën C4 ECU, Peugeot 307 ECU, 1.4 16V KFU ECU

Product Overview

High-quality engine control unit (ECU) IAW 6LP2.05 from Magneti Marelli, designed for use in vehicles equipped with the 1.4 16V KFU engine family. This unit is suitable for professional workshops and experienced DIY mechanics who need a reliable engine management module to restore proper fuel injection, ignition timing and engine operation. Commonly searched by its part numbers and codes, the ECU is a direct-fit solution for affected Citroën and Peugeot models where the IAW 6LP2.05 specification is required.

How This Unit Works And What It Controls

The ECU Controls Fuel Injection, Ignition Timing, Idle Management And Diagnostic Communication. It Receives Inputs From Sensors (Crankshaft Position, Camshaft Position, Throttle, MAP/MAF, Temperature Sensors) And Commands Injectors, Ignition Coils And Idle Actuators To Ensure Stable Engine Performance. A Faulty Unit Can Cause Misfires, Poor Starting, Increased Fuel Consumption Or Loss Of Power.

How To Replace

General Replacement Steps: Disconnect The Battery Before Any Work. Locate The ECU (Usually In The Engine Bay Or Close To The Firewall Depending On Model). Unplug Electrical Connectors Carefully And Remove Fastening Bolts. Swap The Unit, Refit Connectors And Secure Bolts With Correct Torque. After Mechanical Fitment The Unit May Require Coding Or Data Transfer To Match The Vehicle Immobiliser And Key System — See Installation And Coding Section Below.

Technical Information

• Manufacturer: Magneti Marelli
• Model: IAW 6LP2.05
• Product Codes: 9664339980, 9664934380
• Additional Numbers: 9653979480, 9650909180, 16.735.084, 16.631.064, 16.631.054, 16.735.054, 1940XH, 1940XJ
• Engine Compatibility: 1.4 16V KFU
• Origin Vehicle: Removed From Citroën C4

Installation And Coding – Important

• The Unit Is Used And Is Paired With The Original Vehicle (VIN/PIN/Keys).
• Options For Commissioning:
  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 Procedure To Avoid Damaging The Unit.

Installation Recommendations

Perform Installation In A Dry, Clean Environment. Inspect Connector Pins For Corrosion Or Bent Contacts And Clean The Mating Surfaces If Necessary. Use Proper Tools For Fasteners And Follow Manufacturer Torque Specifications Where Available. After Installation Verify Wiring Grounds And Battery Voltage. If Cloning Is Chosen, Ensure A Complete EEPROM/Flash Backup Of The Original Unit. If Virginizing, Prepare The Required Diagnostic Equipment And Original Key Information.

Most Common Failure Causes

ECUs Of This Type Typically Fail Due To Water Ingress, Corrosion On Connectors, Thermal Stress And Solder Joint Fatigue. Electrical Surges From Faulty Charging Systems Or Jump-Starting With Incorrect Polarity Can Damage Internal Electronics. Software/Immobillizer Mismatches Or Lost Key Pairings Are Also Frequent Sources Of Perceived ECU Faults.

Who Should Fit This Unit

Recommended For Experienced Mechanics And Workshops Familiar With PSA Electronics. DIY Enthusiasts With Good Electrical Knowledge Can Perform Mechanical Replacement; Coding Or Cloning Steps Should Be Carried Out By A Specialist Or With Proper Diagnostic Equipment.

Keywords For Search

ECU IAW 6LP2.05, Magneti Marelli ECU, Citroën Peugeot Engine Control Unit, 9664339980, 9664934380, 1.4 16V KFU ECU

Commonly found in models such as Citroën C4, the IAW 6LP2.05 can also replace product codes 9664339980, 9665486380, 16.735.094, 16.631.064, 1940XH, and 1940XJ, ensuring versatility in repair and maintenance.

Typically, engine control units can fail due to electrical issues, overheating, or physical damage, which may result in poor engine performance. It is essential to replace a malfunctioning ECU promptly to maintain vehicle efficiency and performance.

Technical Information:

• Manufacturer: Magneti Marelli
• Model: IAW 6LP2.05
• Product Codes: 9664339980, 9665486380
• Additional Numbers: 16.735.094, 16.631.064, 1940XH, 1940XJ