Description
Vacuum reservoir and oil vapor separator for CITROËN and PEUGEOT vehicles with 2.2 HDi 125 kW engine
Product Overview
This combined vacuum reservoir and oil vapor separator (often referenced under part numbers 9653275280 and 1180Q) is designed for the 2.2 HDi diesel engines used in various Citroën and Peugeot models. It stores vacuum for the brake booster and other vacuum-operated systems while separating oil vapors from the crankcase ventilation stream to protect the intake system and turbocharger. The unit improves vacuum stability under load and prevents oil contamination of the intake manifold.
Fitment And Compatibility
Commonly fitted to vehicles with the 2.2 HDi 125 kW engine, including but not limited to:
Citroën C5 (X7), Citroën C6, Citroën C8, Peugeot 407, Peugeot 607, Peugeot 807. The part is frequently searched for by its product codes 9653275280 and 1180Q.
Function And Symptoms Of Failure
Function: The unit serves two main roles — acting as a vacuum accumulator to ensure steady vacuum supply for the brake servo and other actuators, and functioning as an oil vapor separator (PCV cooler) to capture oil droplets and return them to the sump or prevent them from entering the intake.
Symptoms Of Failure: Loss of vacuum (harder brake pedal or delayed brake assist), oil smell from the intake, increased oil consumption, smoke from the exhaust, rough idle or turbocharger contamination. Clogged separator passages can increase crankcase pressure and lead to oil leaks or turbo contamination.
Replacement Procedure (Practical Guide)
Replacement is straightforward for experienced technicians and mechanically minded DIYers. Typical steps:
- Allow the engine to cool and park on a level surface.
- Locate the unit in the engine bay and identify all vacuum hoses and PCV lines connected to it.
- Release and mark hoses and vacuum lines to ensure correct reassembly; remove retaining clips and electrical connectors if present.
- Unbolt the reservoir from its mounting bracket and remove the unit.
- Install the new reservoir, ensuring the check valve orientation and hose routing match the original setup. Replace any brittle hoses or worn clamps.
- Reattach all lines and secure mounting bolts to the manufacturer’s torque settings where available. Start the engine and verify vacuum integrity and absence of leaks.
Note: Replace any vacuum hoses and clamps that appear hardened, cracked, or oil-soaked to prevent premature failure of the new unit.
Technical Information
- Manufacturer: Stellantis
- Model: Citroën C5 (X7), Citroën C6, Citroën C8, Peugeot 407, Peugeot 607, Peugeot 807
- Product Codes: 9653275280
- Other Numbers: 1180Q
Mounting Recommendations
When installing this unit, ensure all vacuum and PCV hoses are new or in good condition and routed exactly as the original. Secure hose clamps to prevent vacuum leaks. Pay attention to the check valve orientation — incorrect installation will prevent proper vacuum supply. After installation, run the engine and test brake assist feel and vacuum stability under varying engine speeds. If the vehicle is equipped with an electric vacuum pump, verify pump operation and hose connections.
Why This Part Commonly Fails
Typical causes of failure include long-term oil contamination, soot buildup, heat ageing and physical cracks from vibration or impact. Oil-laden blow-by will clog separator media over time, reducing separation efficiency and causing increased crankcase pressure. Rubber hoses and internal valves may harden or stick, leading to vacuum loss. Addressing the root cause (excessive blow-by, worn turbo seals, or blocked crankcase return) helps prevent repeat failures.
Notes For Buyers
This unit is a direct-replacement wear part for the listed HDi engines. Because many technicians and DIYers search by part number, the codes 9653275280 and 1180Q are included here for easier identification.
