Description
Filter box 1.6 HDI 80kw 9HZ for CITROEN C5 II, X7 and PEUGEOT 407 cars
Part description
This filter box (air filter box) is designed for the 1.6 HDI 80 kW (9HZ) engine and is used in Citroën C5 II / C5 X7 and Peugeot 407 cars. The filter box ensures correct seating and routing of the air filter, protection of the intake from dirt and stable air supply to the engine. When exchanging, you will especially appreciate that the exact product number is the search criteria – below we list all the numbers from the documents.
Technical information
- Manufacturer: Stellantis (Citroën / Peugeot)
- Model: Citroën C5 II, Citroën C5 X7, Peugeot 407
- Other numbers: 9648938580, 9651883080, 1420N9
Product codes
- Product codes: 9685205580, 9651883080, 9648938580, 1420N9
Installation recommendations
Generally/typically for a filterbox (air filter box), replacement is straightforward, but it is important to ensure that the intake connections are tight and that all hoses and lines are properly seated. The exact steps may vary depending on the specific version of the car and the design of the intake.
1) Before assembly
- Compare the new and original part: shape, fit, neck diameters, hole locations and connections for hoses/lines.
- Check the condition of the plastic: cracks, broken holders, deformation of the contact surfaces.
- Verify compliance by product codes (9685205580 / 9651883080 / 9648938580 / 1420N9).
- If lid/cap assembly is included, check seating edges and latches/clasp function.
2) Necessary tools and materials
- Basic set of ratchets and attachments / screwdrivers (according to the type of connections)
- Hose clip pliers (if used)
- A clean rag or a mild cleaner to remove dust from around the intake
- Possibly new clips or small fasteners if the original ones are damaged
3) Step-by-step assembly procedure
- Turn off the ignition, allow the engine to cool and access the part.
- Dismantle the obstructing covers/lines if they prevent the removal of the filter box.
- Undo the clamps/sleeves on the suction connection and carefully disconnect the connected hoses.
- If there are cables or holders running on the filter box, loosen them so as not to damage them.
- Unscrew/unlock the attachment of the filter box to the bodywork/engine compartment (depending on the design).
- Remove the original filter box and check the surroundings – remove dirt that could fall into the intake.
- Move any additional elements from the original piece (holders, inserts, rubber stops) if they are not part of the supplied part and are usable.
- Place the new filter box in the correct position and first attach it lightly.
- Connect all hoses/suction connections and check that they fit straight and without tension.
- Tighten the attachment of the filter box and secure the clips/sleeves on the connections.
- Put back the covers and fix the lines/cabling into the original holders.
- Visual check that there is no loose hose, leaky connection or unsecured clip.
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4) Post-assembly checks and test drive/function verification
- Start the engine and check for a hissing or unusual intake sound (typically a sign of a leak).
- Verify that the engine runs smoothly and the throttle response is smooth.
- After a short ride, visually check the connections again to see if any hoses have come loose.
5) The most common assembly mistakes + how to avoid them
- Not tightened clamps/sleeves → always check all suction connections after assembly.
- Pinched or poorly fitted sealing edges → seat the part without tension, do not pull over the edges.
- Forgotten wiring/hoses attachment → put everything back in the holders to avoid abrasion and vibration.
- Damage to plastic handles during disassembly → work with sensitivity, use suitable tools for clips.
Reasons why the part is damaged
- Plastic cracks due to heat and age in the engine compartment.
- Incompetent handling during filter replacement or service interventions (broken latches, holders, handles).
- Vibration and tension in the suction caused by badly seated hoses or missing stops.
- Leaks and increased stress on joints when using damaged clips/sleeves or poor fit.
