This Eaton vacuum/pressure valve is designed to control vacuum supply to swirl flaps and EGR systems on a range of Citroën and Peugeot petrol engines. It Acts As An Electromagnetic Solenoid That Modulates Vacuum To The Actuators, Enabling Proper Swirl Flap Operation And Exhaust Gas Recirculation Control. The Part Is Often Searched By Its Reference Numbers And Fits Several Stellantis Models, Making It A Common Replacement Item For Garages And DIY Enthusiasts.

Technical Information

• Manufacturer: Eaton
• Model: Citroën C5, Citroën C8, Peugeot 307, Peugeot 406, Peugeot 607, Peugeot 807
• Product Codes: 1951610, 1628CH
• Other Numbers: NFP (Reference Tag From Supplier Listing)

Function And Application

The Valve Regulates Vacuum Or Pressure Sent To Swirl Flap Actuators And The EGR Circuit, Allowing Controlled Airflow Swirl In The Intake Manifold And Accurate Exhaust Gas Recirculation. Proper Operation Improves Engine Torque At Low RPM, Reduces Emissions And Ensures Stable Idle. On The Vehicle, The Valve Is Typically Mounted Near The Intake Manifold Or EGR Assembly And Is Connected Via Vacuum Hoses And An Electrical Connector.

Replacement Procedure (Overview)

Recommended For Experienced Mechanics Or Competent DIYers. Typical Replacement Steps:

• Disconnect The Battery To Avoid Electrical Shorts.
• Locate The Valve Near The Intake Manifold / EGR Unit And Identify Vacuum Hoses And The Electrical Connector.
• Label Or Photograph Hose Routing Before Removal To Ensure Correct Reassembly.
• Disconnect The Electrical Connector And Carefully Remove Vacuum Hoses (Clamps Or Quick Connectors May Be Present).
• Unbolt The Valve From Its Bracket, Replace Any Seals Or O-Rings If Accessible, And Install The New Unit.
• Reconnect Hoses And Connector, Restore Battery, And Clear Any Engine Fault Codes If Present.
• Verify Operation By Observing Swirl Flap Movement, Checking For Vacuum Leaks, And Confirming That Related Fault Codes Do Not Return.

Installation Recommendations

• Use New Vacuum Hoses Or Clamps If Old Ones Are Brittle Or Cracked.
• Replace O-Rings Or Seals To Ensure A Tight Vacuum Seal.
• Check Electrical Connector For Corrosion And Ensure Proper Pin Contact.
• Torque Fasteners To Manufacturer Specifications Where Available; Avoid Over-Tightening Plastic Mounts.
• After Installation, Perform A Functional Check Under Engine Running Conditions And Confirm Absence Of Vacuum Leaks.

Common Failure Causes

The Most Frequent Reasons For Valve Failure Include Soot And Carbon Contamination From The EGR System, Brittle Or Cracked Vacuum Hoses, Electrical Connector Corrosion, And Internal Diaphragm Or Solenoid Wear. Failure Symptoms Often Include Check Engine Light, Loss Of Low-End Torque, Rough Idle, Or Erratic Swirl Flap Behavior. Lifespan Varies With Driving Conditions; Units On High-Mileage Vehicles Or Those With Heavy City Driving And Frequent EGR Use Tend To Fail More Often.

Why Choose This Unit

Having The Correct Valve By Eaton With The Right Reference Numbers Improves Fitment Confidence And Reduces Diagnostic Time. Listing Of Product Codes In The Description Helps Technicians And DIYers Find The Correct Replacement Quickly When Searching By Part Number.

Notes For Buyers

Part Numbers And Model Coverage Shown Above Are Supplied From The Item Listing And Fitment Tags. If The Vehicle Is Among The Listed Models, This Valve Is Commonly Used As A Direct Replacement For The Described Functions. This Item Is Offered As A Used Unit With A Functional Guarantee As Stated In The Original Listing.

This vacuum/pneumatic control valve from EATON is a direct-fit component commonly used on Citroën and Peugeot diesel engines to regulate pressure to swirl-flap actuators and to control EGR-related vacuum circuits. Designed for professional workshops and DIY mechanics, the unit is often searched by its product numbers (1951510, 1628CH) — include these codes when looking up fitment or replacement parts.

Typical symptoms of a failing valve include illumination of the engine warning light, rough or unstable idle, reduced engine responsiveness, irregular EGR operation or swirl-flap faults, and occasional loss of torque or increased fuel consumption. Diagnosing should start with visual inspection of vacuum lines and electrical connector, followed by functional testing of the valve with a multimeter and a vacuum/12V supply if available.

Technical Information

• Manufacturer: Eaton
• Model: Citroën C5; Citroën C8; Peugeot 307; Peugeot 406; Peugeot 607; Peugeot 807
• Product Codes: 1951510, 1628CH
• Additional Numbers: NFP

Installation Recommendations

• Prepare: Work on a cool engine, disconnect the battery if required by your workshop practice to avoid electrical faults.
• Removal: Locate the valve (often mounted on or near the intake manifold/EGR assembly), unplug the electrical connector, and remove mounting screws or clips. Gently detach vacuum hoses and note routing.
• Inspection: Check vacuum hoses, O-rings and mating surfaces for cracks, hardening or carbon deposits. Replace hoses and O-rings as needed to ensure a leak-free installation.
• Fitting: Fit the replacement valve, secure mounting fasteners to original torque where specified, reconnect vacuum lines and the electrical connector. Start the engine and confirm correct operation; check for vacuum leaks and clear any stored fault codes after replacement.
• Testing: If possible, bench-test the valve with a 12V supply and a handheld vacuum pump or measure coil resistance with a multimeter to confirm electrical continuity before installation.

Reason For Common Failure

• Carbon Contamination: Soot and carbon build-up in EGR or intake systems can clog or block valve passages and ports, impairing movement and sealing.
• Vacuum Hose Degradation: Old or brittle vacuum hoses leak or collapse, preventing the valve from actuating correctly.
• Mechanical Wear Or Diaphragm Damage: Internal diaphragms or seals can rupture over time, causing loss of vacuum control.
• Electrical Faults: Corroded connectors, damaged wiring or coil failures lead to loss of valve actuation.

This part is suitable for professional replacement and for competent DIY mechanics familiar with intake/EGR systems. When replacing, always renew associated sealing elements and inspect the vacuum supply to ensure a reliable, long-term repair.