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.

Engine control units (ECUs) play a vital role in the vehicle’s fuel injection system, ensuring optimal fuel efficiency and emission control. They continuously monitor various engine parameters and adjust functions accordingly to maintain performance.

It’s important to replace the ECU when experiencing performance issues, as they may deteriorate over time due to heat and vibrations, leading to faulty readings and engine malfunctions. Regular checks can help identify when a replacement is necessary.

Technical Information

• Manufacturer: MAGNETI MARELLI
• Model: IAW 6LP2.05
• Product Codes: 9664339980, 9664164680
• Additional Numbers: 16.735.074, 16.631.064, 1940XH, 1940XJ

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

As a critical part of the engine management system, the control unit regulates fuel injection and optimizes engine performance, ensuring efficient operation and reduced emissions. With its advanced technology, it plays a vital role in vehicle functionality, affecting acceleration, fuel efficiency, and overall driving experience.

When considering a replacement, it’s important to be aware that control units like the IAW 6LP2.12 may fail due to electrical issues, moisture ingress, or manufacturing defects. Regular inspections of your vehicle’s electronic components can prevent unexpected failures.

Technical Information:

• Manufacturer: Magneti Marelli
• Model: IAW 6LP2.12
• Product Codes: 9665936280, 9664339980
• Other Numbers: 16.631.064, 1607022280, 1607022380