Description
Filterbox 1.6 HDi 80 kW for Citroën C5 II (X7) and Peugeot 407.
This filter box is designed for the 1.6 HDi 80 kW diesel engines used in Citroën C5 II (X7) and Peugeot 407. Ideal for mechanics and DIY enthusiasts who search by OE numbers, this replacement part restores correct air routing and protects the engine by housing the air filter element. The robust construction ensures secure mounting and reliable sealing to prevent unfiltered air ingress, which can cause performance loss and increased wear. Featuring compatible product codes listed below, the unit is a direct-fit part for affected models and simplifies workshop replacement with common tools.
Technical Information
- Manufacturer: Stellantis (Citroën / Peugeot)
- Model: Citroën C5 II (X7); Peugeot 407
- Product Codes: 9659405080; 9651883080; 1420N9
- Additional Numbers: 1.6 HDi, 80 kW
Function And Benefits
The filter box houses the engine air filter and channels intake air to the turbocharger and engine. A properly sealed filter box prevents contamination from dust, moisture and debris, helping to maintain fuel economy, throttle response and turbocharger longevity. Replacing a damaged filter box restores correct air metering and prevents unfiltered air from bypassing the filter element.
Typical Replacement Interval And Symptoms
Filter boxes do not have a fixed service interval and usually last the life of the vehicle unless damaged. Replace the unit if you notice visible cracks, broken mounting tabs, persistent check-engine lights related to intake or mass-air readings, unusual whistling from the intake, or if the airbox no longer seals properly. Addressing a faulty filter box promptly prevents accelerated wear of the air filter and downstream components.
Installation Recommendations
- Prepare basic workshop tools: screwdriver set, socket set and new clamps if required.
- Disconnect the battery if you will unclip or disconnect any sensors near the airbox to avoid accidental faults.
- Release clamps and remove intake ducts connected to the airbox; carefully unplug any sensors (e.g., MAF) if present and note their orientation.
- Remove fixing bolts or clips and lift out the old filter box with the air filter element; inspect and replace the filter element if needed.
- Fit the new filter box, ensuring all sealing surfaces and gaskets are clean and correctly seated; tighten clamps to proper torque and reconnect sensors and ducts.
- Start the engine and check for intake leaks, unusual noises and that no diagnostic warnings remain.
Why This Part Most Often Fails
- Physical Damage: Impact or improper handling can crack the housing or break mounting tabs during maintenance.
- Age And Heat Cycling: Prolonged exposure to engine heat and vibration can embrittle plastic, leading to hairline cracks and leaks.
- Poor Sealing: Worn or damaged gaskets and loose clamps allow unfiltered air ingress, causing contaminants to bypass the filter element.
- Aftermarket Modifications: Incorrectly fitted intake upgrades or clamps can stress mounting points and accelerate failure.
Pick this filter box when you require a direct-fit replacement for Citroën C5 II (X7) and Peugeot 407 1.6 HDi 80 kW applications. Use the OE product codes 9659405080, 9651883080 or 1420N9 to find the correct listing quickly and ensure compatibility with the targeted engine variant.
