Product Overview

This intake air resonator is an OEM-style component manufactured for Stellantis Citroën and Peugeot platforms. Designed to fit a range of 1.8i, 2.0i and 2.2i petrol engines (including applications such as the Peugeot 407), the resonator smooths airflow, reduces intake noise and helps maintain consistent air delivery to the engine. Commonly searched under part numbers 9646767780 and 1427J9, this unit is a direct-replacement item aimed at professional workshops and DIY mechanics who require a reliable, vehicle-specific intake component.

Benefits

• Reduces induction noise and unpleasant resonance during throttle changes.
• Stabilizes airflow to the throttle body and mass air flow (MAF) sensor for smoother idling and throttle response.
• OEM-fit design ensures correct mounting points and sealing to the airbox and intake ducting.
• Direct-fit replacement using original part numbers improves compatibility and reduces installation time.

Technical Information

• Manufacturer: Stellantis / Citroën / Peugeot
• Model: Citroën and Peugeot vehicles with 1.8i, 2.0i and 2.2i petrol engines (e.g. Peugeot 407)
• Product Codes: 9646767780, 1427J9
• Other Numbers: NFP

Installation Recommendations

Recommended for fitment by experienced technicians or competent DIYers. Typical replacement procedure:

• Park vehicle on level ground and allow the engine to cool.
• Remove the engine cover (if fitted) and/or loose intake trim to access the airbox and resonator.
• Loosen hose clamps and remove any retaining clips or screws holding the resonator to the airbox and intake duct.
• Carefully withdraw the resonator from the intake assembly, checking surrounding hoses and connectors for wear.
• Fit the new resonator in the correct orientation, replace seals or clamps as needed and tighten fasteners to the original torque where specified.
• Reinstall any removed covers and perform a visual check for leaks. Start the engine and listen for changes in intake noise and idle quality.

Tip: Inspect the MAF sensor, intake boots and clamps while the resonator is removed. Replace damaged hoses or loose clamps to ensure a long-lasting repair.

Most Common Failure Causes

• Material fatigue and cracking due to heat cycles and engine bay vibration—plastic resonators can develop splits that cause vacuum leaks and increased intake noise.
• Oil contamination from PCV system or turbocharger blow-by (on applicable engines) leading to softening or deforming of the resonator and seals.
• Loose or broken mounting points and degraded rubber seals resulting in air leaks and poor sealing to the airbox.
• Age-related deterioration of internal baffles which can increase intake noise and affect airflow characteristics.

Maintenance And Service Life

There is no fixed interval for replacement. Inspect the resonator during routine service (air filter replacement or when diagnosing intake leaks). Typical signs that indicate replacement is required include audible hissing or sucking noise from the intake, rough idle, or visible cracks/deformation on the resonator body.

Compatibility And Part Numbers

When ordering, reference the product codes listed above (9646767780, 1427J9) to improve the chance of correct fitment. The resonator is intended as a direct replacement for matching Citroën and Peugeot 1.8i / 2.0i / 2.2i engine applications, including models such as the Peugeot 407 where these part numbers apply.

Who Should Fit This Part

Suitable for professional auto technicians and experienced DIY mechanics comfortable working in the engine bay. If you are unsure about removal steps or encounter electronic sensors while accessing the resonator, consult a workshop manual or a qualified technician.

This used intake resonator connection is a direct-fit part for Citroën and Peugeot 2.0i petrol engines. Commonly searched by product numbers 9626612880 and 14265E, it links the air resonator to the intake system, helps dampen induction noise and ensures correct airflow to the throttle body. Ideal for professional mechanics and DIY enthusiasts who need a reliable replacement part that restores airtightness and engine response in the low and mid rpm range.

Technical Information

Manufacturer: Stellantis / Citroën / Peugeot

Model: Citroën C5, Peugeot 407 (2.0i)

Product Codes: 9626612880, 14265E

Other Numbers: NFP

Function

The connector joins the intake resonator to the air intake tract. It reduces induction noise, cushions airflow pulsations and helps maintain steady pressure and flow to the throttle body. A sealed, correctly fitted connector prevents unmetered air entering the intake, which can otherwise cause rough idling or drivability issues.

Fitment And Replacement

Fitment is typically straightforward for technicians familiar with PSA engine bays. Access the resonator and intake snorkel by removing the engine cover and any obstructing trim. Loosen hose clamps or remove retaining clips, slide off the old connector and inspect adjoining ducts for damage. Fit the new connector, ensuring a snug fit on both mating parts and re-tighten clamps to secure an airtight seal. After installation, start the engine and check for vacuum leaks or abnormal induction noise.

Installation Recommendations

– Work on a cool engine and keep the intake area clean to avoid debris entering the system.
– Use appropriate stainless or OEM-style hose clamps and avoid overtightening which can deform the connector.
– Inspect adjacent components (airbox seals, MAF sensor boot, resonator housing) for wear when replacing the connector.
– After assembly, verify idle stability and perform a visual leak test (soapy water or smoke) if available.

Why This Part Fails Most Often

Failures are usually caused by age-related material fatigue, heat cycles, and mechanical vibration. Exposure to engine bay heat, oil contamination from crankcase ventilation systems, or impact from road debris can lead to cracks, hardening or deformation of the connector. Once the seal is compromised, symptoms include increased induction noise, erratic idle, loss of low-end torque or error codes related to airflow inconsistencies.

How Often It Fails

There is no fixed replacement interval; the connector often lasts many years but should be inspected during routine service or when symptoms appear. Vehicles exposed to frequent short trips, high underbonnet temperatures or oil blow-by may require earlier replacement.

Note On Search And Identification

This part is frequently searched by its product numbers (9626612880, 14265E). Use these reference numbers when checking fitment for Citroën C5 and Peugeot 407 2.0i applications to speed up identification.

Description

This intake resonator connector is a direct-fit component designed for Citroën and Peugeot vehicles equipped with the 2.0i petrol engine. It links the air resonator (intake silencer) to the air intake tract, helping to smooth airflow, reduce intake noise and maintain consistent engine response. Ideal for professional workshops and DIY mechanics searching by OE numbers (9641733880, 143431), this part restores proper sealing and resonance characteristics after damage or wear.

Benefits

• Restores correct intake tract sealing to prevent unmetered air leaks that affect idle and performance.
• Reduces intake noise and resonance for a quieter engine bay.
• OE-compatible fit that simplifies replacement and reduces installation time.
• Valuable for mechanics and car owners who search by part numbers (9641733880 / 143431).

Technical Information

• Manufacturer: Stellantis / Citroën / Peugeot
• Model: Citroën C5; Peugeot 407 (vehicles with 2.0i engine)
• Product Codes: 9641733880, 143431
• Additional Numbers: OE Equivalent Numbers 9641733880 | Internal Tag 143431

Installation Recommendations

Replacement is straightforward for a trained technician or an experienced DIYer. Follow these practical steps:

• Work on a cool engine and ensure the intake system is depressurized.
• Remove the air intake hose clamps and detach the airbox or resonator as needed to access the connector.
• Inspect mating surfaces, gaskets and adjacent hoses for wear or oil contamination; clean before fitting the new connector.
• Replace or tighten hose clamps to the manufacturer’s recommended tension to avoid leaks; use quality clamps to prevent failure.
• After installation, check for intake leaks at idle and under load; listen for abnormal intake noise and verify stable idle.

Why This Part Fails

Common causes of failure include long-term heat and UV exposure that makes the plastic brittle, oil contamination from crankcase ventilation that weakens the material, mechanical damage during previous repairs, and clamp fatigue or improper installation allowing air leaks. Failure typically presents as hissing or fluctuating idle, reduced throttle response or a noisy intake.

Notes For Buyers

• Searchable by OE numbers 9641733880 and 143431 — include these in your search to find the correct replacement quickly.
• Inspect surrounding intake components (hoses, clamps, resonator box) when replacing this connector to prevent repeat failure.
• Designed for vehicles equipped with the 2.0i engine; verify engine type before ordering.

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.