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.