Description
Filter box without water–air heat exchanger for Citroën C5, C8 and Peugeot 607, 807 with 2.0 and 2.2 HDi engines.
This replacement air filter housing is designed for the 2.0 and 2.2 HDi diesel engines used in Citroën C5 and C8 and Peugeot 607 and 807. Built to provide a secure, sealed location for the engine air filter and intake ducting, the unit helps maintain correct airflow to the turbocharger and mass airflow sensor while protecting the intake tract from dirt, moisture and debris. Ideal for workshops and experienced DIY mechanics searching by part number (9640454480 / 1427J3), the housing is a direct-fit solution where the vehicle specification calls for a filter box without the integrated water–air heat exchanger.
Technical Information
- Manufacturer: Stellantis / Citroën / Peugeot
- Model: Citroën C5, Citroën C8, Peugeot 607, Peugeot 807
- Product Codes: 9640454480, 1427J3
- Other Numbers: No additional OEM cross-references provided
Function And Fitment
The air filter box houses the engine air filter element and joins the intake ducting to the turbocharger and mass airflow/meters. By keeping the intake air clean and directing it through the correct path, the housing ensures stable airflow measurement and reduces the risk of foreign object entry. This specific version is produced without the water–air heat exchanger, so it fits vehicles whose intake assembly does not require that additional component.
Recommended Installation
Replacement is straightforward for competent mechanics and experienced DIYers. Typical steps:
- Park vehicle on level ground, switch off engine and allow to cool. Disconnect negative battery terminal if you will be removing or working near electrical sensors.
- Remove the intake ducts and loosen any clamps securing the airbox to the turbo inlet and to ducting. Carefully unplug any electrical connectors (e.g. mass airflow sensor) and breather hoses attached to the housing.
- Undo mounting bolts or clips holding the housing. Support the box while releasing the last fastener to avoid dropping and damaging surrounding components.
- Fit the new housing in reverse order: position, secure mounting points, reconnect hoses and sensors, then refit intake ducts and clamps. Ensure all seals and gaskets sit correctly to prevent unmetered air ingress.
- After installation, start the engine and check for intake leaks, rattles or warning lights. Recheck clamps and connections after a short road test.
Why This Part Fails Most Often
- Cracked Or Broken Mounting Tabs: Plastic housings become brittle with age and heat cycles; broken tabs cause vibration and air leaks.
- Physical Damage: Impact from road debris or minor collisions can crack the box or deform mating surfaces.
- Oil And Soot Contamination: Diesel engines (HDi) can deposit soot and oil in the airbox, accelerating deterioration of seals and promoting blockages.
- Poor Sealing Or Degraded Gaskets: Failed seals allow unfiltered air into the intake, causing incorrect airflow readings and performance issues.
- Incorrect Previous Repairs: Improperly fitted ducting or clamps can overstress the housing or allow water ingress under heavy rain.
Inspect the airbox whenever replacing the air filter or if the vehicle shows signs of poor running, fluctuating idle, or turbo lag. Replacing a damaged housing restores correct airflow, protects downstream sensors and the turbocharger, and helps maintain engine performance and fuel economy.
