This replacement air inlet/distributor for the 1.6 e-HDi engine (OE Reference 9678406580) restores correct routing of intake air between turbocharger, intercooler and intake tract. Designed for professional workshops and experienced DIY mechanics, the part helps eliminate boost leaks, unstable idle and related fault codes frequently encountered on older diesel turbo systems.

Key Benefits

Durable design matched to OE geometry for easy fitment. Restores proper air flow and boost integrity to reduce turbo underboost faults and mass‑air sensor errors. Ideal when original hoses have become brittle, cracked or oil‑contaminated.

Technical Information

• Manufacturer: Stellantis / Citroën / Peugeot
• Models: Citroën Berlingo B9 (Berlingo III), Citroën C4 II, Citroën C4 Picasso, Peugeot 308, Peugeot Partner III, Peugeot Partner Tepee
• Product Codes: 9678406580
• Other Numbers: Related Fault Codes: P0101, P0299

Function

This component routes intake air and links the turbo/intercooler circuit to the intake manifold and associated sensors. A sealed, correctly sized connection is essential for accurate Mass Air Flow (MAF) readings and proper turbocharger boost control. Any leak or restriction in this area can trigger diagnostic trouble codes and degrade engine performance.

How To Replace

Suitable for experienced technicians and competent DIYers. Basic replacement steps:

• Allow the engine to cool. Work on a cold engine to avoid burns and to ensure hoses are easier to remove.
• Remove any engine covers or components obstructing access to the air connection.
• Loosen and remove hose clamps and any retaining clips. Carefully detach sensors or vacuum lines connected to the part.
• Inspect sealing surfaces and replace any O‑rings or gaskets if present. Clean mating surfaces from oil and soot.
• Install the new part, ensuring correct orientation and secure clamping to manufacturer torque recommendations for hose clamps.
• Reconnect sensors and vacuum lines. Refit covers and start the engine to check for leaks and stable idle.
• After installation clear stored fault codes and, if possible, perform a boost/leak test or smoke test to confirm sealing integrity.

Installation Recommendations

• Use new stainless or OEM‑quality hose clamps to ensure long‑term sealing.
• Replace any adjoining rubber hoses that show cracking, softening or oil saturation at the same time.
• Clean MAF sensor and intake tract before finishing to avoid residual contamination affecting readings.
• If fault codes persist after replacement, check turbocharger actuator, boost control hoses and MAF sensor calibration.

Why This Part Fails

Common failure causes include material ageing and heat exposure that lead to hardening, cracks and splits. Oil contamination from turbocharger leaks or EGR/PCV systems accelerates deterioration. Mechanical strain from improperly fitted clamps or distorted mating flanges also causes leaks. Typical symptoms are rough idle, loss of power, increased fuel consumption and fault codes such as P0101 (MAF circuit range/performance) and P0299 (turbocharger underboost).

Compatibility And Notes

Part number 9678406580 is widely referenced for the 1.6 e‑HDi diesel range fitted to the listed Citroën and Peugeot models. Always verify the physical shape and connector positions against the vehicle before installation to ensure correct fitment.