This air intake filter box (OE 9640454480, 1427J3) is a direct-fit replacement designed for Citroën and Peugeot vehicles equipped with 2.0 and 2.2 HDi diesel engines. Built to restore correct airflow and sealing of the intake tract, the unit is ideal for professional garages and DIY mechanics who search by OE number or model. Replacing a damaged airbox prevents unmetered air leaks, protects the turbocharger and MAF sensor from contamination, and helps maintain engine performance and fuel economy.

Function: The filter box houses the air filter element and directs intake air to the turbocharger and engine while sealing the intake from engine bay contamination. This version is supplied without the water-to-air heat exchanger, matching the configuration used on the listed models and engine variants.

Technical Information

• Manufacturer: Stellantis
• Model: Citroën C5; Citroën C8; Peugeot 607; Peugeot 807
• Product Codes: 9640454480, 1427J3
• Additional Numbers: None Provided

Installation Recommendations

• Tools Required: Common hand tools (screwdrivers, socket set), pliers for hose clamps, and a torque wrench if reusing torque-sensitive fasteners.
• Procedure Summary: Disconnect battery for safety, remove intake hoses and MAF sensor if attached, unclip or unscrew fasteners securing the old airbox, swap the airbox and seals, refit hoses and sensors ensuring airtight connections. Check that all clips and clamps are fully engaged.
• Time Estimate: Approximately 30–60 minutes in a typical workshop environment, shorter for experienced technicians.
• Notes: Inspect the air intake hoses, MAF sensor, and sealing gaskets while installing. Replace any brittle or damaged seals to ensure proper sealing and avoid sensor errors.

Why This Part Fails Most Often

• Cracked Housing: Plastic housings degrade over time due to heat cycles and vibration, leading to cracks and air leaks.
• Broken Clips And Mounts: Impact, rough handling during service, or fatigue can break the attachment points, causing poor sealing or rattles.
• Seal And Gasket Deterioration: Rubber seals harden or tear, allowing unmetered air to bypass the filter and trigger fault codes or rough idling.
• Contamination And Clogging: Excessive dust, oil or coolant ingress (if previous failures occurred) can damage internal components and reduce airflow.
• Previous Repairs: Improper repairs or makeshift fixes often accelerate failure or create secondary issues (loose clamps, misaligned ducts).

Signs that Replacement Is Needed: Visible cracks, audible whistling or suction noises at idle, decreased engine response, or diagnostic codes related to airflow or MAF readings. Because the airbox is not a regular consumable, replacement is typically required only after damage or when seals fail.

Search Tip: Customers frequently locate this part by OE numbers 9640454480 and 1427J3. Verify the part number against the vehicle’s model and engine code before ordering to ensure the correct configuration for 2.0 and 2.2 HDi applications.

This intake filter box with integrated water–air heat exchanger is a direct-fit solution for PSA 2.0 HDi and 2.2 HDi engines. Designed for professional workshops and DIY mechanics, the unit combines air filtration with a coolant-fed heat exchanger to stabilise intake-air temperature and reduce condensation in the intake tract. Commonly searched by OEM and reference numbers (9640454480, 964045780, 1427J3, 144200), this part restores proper air flow and prevents water ingress that can affect engine performance, turbo response and emissions control.

Technical Information

• Manufacturer: Stellantis / Citroën / Peugeot
• Model: Citroën C5, Citroën C8, Peugeot 607, Peugeot 807
• Product Codes: 9640454480, 964045780
• Additional Numbers: 1427J3, 144200

Function and Benefits

The unit houses the air filter element and an integrated water–air heat exchanger. By exchanging heat between engine coolant and the intake air, the exchanger helps to:

• Reduce condensation and water accumulation inside the intake tract.
• Stabilise intake-air temperature for improved cold-start behaviour and combustion consistency.
• Protect downstream components (turbocharger, MAF sensor, EGR) from excessive moisture and contamination.

Fitment and Compatibility

Direct fit for listed Citroën and Peugeot models equipped with 2.0 HDi or 2.2 HDi diesel engines. Always check the reference numbers (9640454480 / 964045780 / 1427J3 / 144200) against the vehicle’s parts catalog when confirming fitment. This item is intended for the intake system where the filter housing and coolant connection points match the OEM layout.

Installation Recommendations

Recommended for installation by experienced technicians or competent DIY mechanics with basic workshop tools. Typical replacement steps:

• Work on a cold engine. If the exchanger is connected to the cooling circuit, relieve system pressure and be prepared to capture any coolant that may spill.
• Disconnect intake hoses, clamps and any electrical connectors (MAF sensor, intake sensors) attached to the housing.
• Unfasten mounting screws/clips securing the filter box and remove the assembly carefully to avoid damage to the exchanger or attached hoses.
• Replace sealing gaskets and hose clamps as needed. Ensure all seals are seated correctly and fastening points are torqued to the manufacturer’s specification.
• After installation, refill and bleed the cooling circuit if it was opened. Start the engine and check for air intake leaks and coolant leaks around the exchanger connections.

Most Common Failure Causes

• Plastic fatigue and cracking from heat cycles and vibration, leading to air leaks or coolant seepage.
• Corrosion or internal blockage of the heat exchanger caused by contaminated or degraded coolant.
• Clogging from dirt, oil or soot in the intake path reducing airflow and performance.
• Damaged seals or hose connections allowing water or air leaks.
• Mechanical damage during removal or reinstallation (broken clips, stripped threads).

Service Advice

There is no fixed service interval for the filter box with heat exchanger; lifespan depends on operating conditions and maintenance. Inspect the unit during major services or when symptoms appear: reduced engine performance, unusual intake moisture, coolant loss, or visible cracks. Replace if leaking, heavily contaminated or mechanically damaged. Use genuine replacement parts or equivalent-quality components and renew seals and clamps during installation to ensure long-term reliability.