This replacement filter box (air intake/air filter housing) is designed for a range of Stellantis diesel models with the 2.0 HDi engine. It houses the engine air filter, secures the Mass Air Flow (MAF) sensor and intake ducts, and ensures clean, metered air reaches the engine for optimal combustion. Supplied to fit original equipment part numbers, this unit is a direct-fit solution for mechanics and experienced DIY enthusiasts who need a reliable, OEM-compatible airbox.

Features And Benefits

– Direct fit for specified Citroën and Peugeot models — reduces installation time compared with universal solutions.
– Maintains correct air routing and MAF sensor positioning to avoid air leaks and inaccurate sensor readings.
– Helps reduce intake noise and protects the air filter from debris and water ingress.
– Supplied with the referenced OEM numbers to simplify parts lookup and ordering.

Technical Information

• Manufacturer: Stellantis (Citroën / Peugeot)
• Models: Citroën C4 Picasso, Citroën C5 X7, Citroën C8, Peugeot 308, Peugeot 3008 (I), Peugeot RCZ, Peugeot DS5
• Product Codes: 9653388980, 9657982380, 1420Q2
• Other Numbers: 9657982380, 1420Q2
• Engine: Primarily 2.0 HDi diesel applications (confirm with part numbers for specific sub‑variants)

Installation Recommendations

• Work With The Engine Cold And Parked On A Level Surface. Remove Intake Ducts And Clamps Securing The Airbox.
• Disconnect The MAF Sensor Electrical Connector Carefully Before Removing The Airbox. Handle The Sensor And Seals Gently To Avoid Damage.
• Unclip Or Unscrew Fasteners Holding The Housing; Remove The Old Box Along With Any Retained Gaskets Or Seals.
• Install The New Filter Box Ensuring All Sealing Surfaces And Gaskets Are Clean And Correctly Seated. Refit The MAF Sensor, Intake Ducts And Clamps, Then Test For Air Leaks.
• Replace The Engine Air Filter When Replacing The Housing; Inspect Hoses And Clamps For Wear And Replace As Needed.

Why This Part Fails Most Often

Airbox housings are generally durable but commonly fail due to plastic fatigue, heat aging and mechanical stress from repeated engine bay temperature cycles. Common causes include cracking at clip points or mounting bosses, damage from impact (e.g., road debris), deterioration of seals that lead to unmetered air leaks, and oil contamination causing softening of plastic. Symptoms of a failing airbox include rattling or whistling noises from the intake, poor idle quality, reduced engine performance, and diagnostic trouble codes related to air flow or mixture when the MAF reads inconsistent values.

Practical Tips For Mechanics And DIYers

• Always Fit New Seals Or Gaskets If The Old Ones Show Any Deformation — A Small Air Leak Can Trigger A Fault Code.
• Check The MAF Sensor For Contamination; Clean Or Replace If Readings Are Erratic After Installing The New Box.
• Keep The OEM Part Numbers (9653388980 / 9657982380 / 1420Q2) Handy When Ordering Related Components Like Clamps, Hoses Or Replacement Filters.
• Inspect Adjacent Components (Intake Ducts, Turbo Inlet, Vacuum Hoses) While The Airbox Is Removed To Avoid Rework.

Compatibility And Ordering

This filter box is intended to match the listed OE part numbers and fit the models and engine family specified above. Use the product codes in the Technical Information section to confirm fitment against your vehicle’s parts documentation or service manuals before ordering.

This air filter box (airbox) is designed for Citroën C4 and Peugeot 307 models equipped with 2.0i petrol engines. The housing secures the air filter element, directs intake airflow, and protects the intake tract from dirt and water. Mechanics and DIY enthusiasts often search by part numbers 9643567080 or 1427J8 when looking for a direct replacement. A correctly fitted airbox ensures accurate airflow measurement, stable idling and optimal engine performance.

Technical Information

Manufacturer: Stellantis / Citroën / Peugeot
Model: Citroën C4; Peugeot 307 (2.0i engines)
Product Codes: 9643567080
Additional Numbers: 1427J8

Application And Fitment

Fits the intake system of 2.0i petrol variants of Citroën C4 and Peugeot 307. Confirm fitment by matching the part numbers 9643567080 or 1427J8 to the original housing. The airbox is compatible with the standard intake layout where the mass air flow (MAF) sensor or intake duct mounts directly to the housing.

Installation Recommendations

• Tools Required: screwdriver or Torx set, 8–10 mm socket, trim tool or small pry for clips.
• Procedure: Remove clamps and intake hoses, unclip or unscrew the airbox fasteners, gently disconnect any attached MAF sensor or hoses, replace the housing and reinstall clamps ensuring a tight seal. Replace the air filter element at the same time.
• Tips: Inspect and clean sealing surfaces and intake ducts before installation. Refit the MAF sensor carefully and avoid contaminating the sensor element. Ensure all clamps are secure to prevent unmetered air leaks.

Most Common Failure Reasons

Airbox failure is usually caused by physical damage, brittle plastic and worn clips. Common causes include impact damage, prolonged exposure to heat that makes the plastic brittle, degraded rubber seals and improper removal that breaks mounting tabs. Symptoms of a failing airbox include whistling or intake noise, unstable idle, decreased engine power, increased fuel consumption and possible fault codes related to intake airflow. Because the housing protects the air filter, any cracks or poor sealing will allow unfiltered air and contaminants into the intake, which can accelerate wear on downstream components.

Why Choose This Replacement

Choosing a correctly numbered replacement housing (9643567080 / 1427J8) restores the original intake geometry and sealing. For workshops and home mechanics, replacing a damaged airbox is a cost-effective way to eliminate intake leaks and maintain engine performance. Always pair the new housing with a new air filter element and check associated intake components (hoses, clamps, MAF sensor) during the service.

High-quality intake resonator designed to control intake tract acoustics and airflow behavior on Citroën C4 and Peugeot 307 models equipped with the 2.0i 130 kW petrol engine. This component integrates a vacuum-actuated flap that helps optimize intake resonance across different engine loads, reducing unwanted induction noise and contributing to smoother throttle response. Commonly searched by its product codes, the part is a direct-fit solution for mechanics and DIY enthusiasts seeking a reliable replacement for a cracked or malfunctioning resonator assembly.

Technical Information

• Manufacturer: Stellantis
• Model: Citroën C4; Peugeot 307
• Product Codes: 9643586380; 9646189680
• Additional Numbers: 143450; 143439; NFP

Function And Benefits

The resonator smooths pressure pulses in the intake tract and reduces intake noise at specific engine speeds. The vacuum flap adjusts the resonator’s internal volume or flow path depending on engine vacuum, improving torque delivery and drivability across the rev range. Replacing a damaged resonator restores proper airflow dynamics, reduces whistling or hissing noises, and helps maintain stable idle and throttle response.

Symptoms Indicating Replacement

• Audible whistling, hissing, or increased intake noise under load or at idle.
• Rough Idle Or Intermittent Hesitation When Accelerating.
• Visible Cracks Or Broken Mounting Tabs On The Resonator Body.
• Vacuum Flap Stuck Or Diaphragm Failure Causing Irregular Airflow.

Installation Recommendations

• Work On A Cool Engine And Disconnect The Battery If Removing Sensors Nearby.
• Remove The Engine Cover And Unclip Or Unscrew The Air Intake Ducting To Access The Resonator.
• Carefully Disconnect Any Vacuum Hoses Connected To The Flap; Note Their Routing For Reassembly.
• Unfasten Clamps Or Screws Securing The Resonator, Remove Old Unit, And Inspect Surrounding Hoses And Seals.
• Fit The Replacement Resonator Ensuring Vacuum Hose Connections Are Secure And Clamps Are Tightened To Manufacturer Torque Where Applicable.
• After Installation, Start The Engine And Check For Air Leaks, Proper Flap Movement, And Normal Idle/Driveability.

Most Common Reasons For Failure

• Age-Related Plastic Degradation And Cracking From Heat Cycling And Engine Bay Vibration.
• Mechanical Damage From Impact Or Improper Removal/Installation.
• Vacuum Diaphragm Or Hose Deterioration Causing The Flap To Stick Or Lose Actuation.
• Oil Contamination Or Debris In The Intake Tract Affecting Flap Movement.

This resonator is frequently searched by its product numbers; verify the listed codes when ordering to ensure you receive the correct direct-fit replacement for Citroën C4 and Peugeot 307 2.0i 130 kW engines.

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.