Citroën C5
PSA four-cylinder naturally aspirated engine from the EW family with 1.8-litre displacement and timing belt. Solid everyday engine between the 1.6 and 2.0. Timing belt change every 120,000 km is mandatory.
Base petrol in the C5
116 hp in the C5 I — entry-level powertrain; slightly tight for the mid-range but durable.
Engine Weaknesses 6
The 1.8 16V uses a conventional timing belt with a 120,000 km replacement interval (some model years 150,000 km). If the belt is not replaced in time, a snap will cause total valve damage on this interference engine.
Symptoms: Engine stumbles on cranking, engine noises, sudden engine stall, metallic impact inside the engine
The head gasket can fail at higher mileages, allowing coolant into the oil or combustion chamber. Typical problem on neglected cooling systems where coolant has not been changed regularly.
Symptoms: White smoke from exhaust, coolant loss without visible leak, oil emulsion in the coolant reservoir
Like the related EW10, the hydraulic tappets in the EW7 1.8 are prone to malfunctions on cold start as they age. Stumbling improves after warm-up but progresses without intervention.
Symptoms: Stumbling and shaking on cold start, misfire warnings, disappears after fully warming up
Sagem ignition coils in the EW7 are a known weakness. Faulty coils cause misfires that can damage the catalytic converter with unburnt fuel. Replacement as a complete set is recommended.
Symptoms: Rough engine running, power drop, engine check light with fault codes P030x, occasional stumbling under load
The shaft seals on both camshafts become porous over time and lose their sealing ability. Oil leaking from the end of the engine is a common age-related issue on this engine that requires regular checking.
Symptoms: Oil spots under the car, visible oil leak at the engine end, oil consumption without oil mist
At higher mileages the camshaft seals on the EW7 frequently leak. The oil loss is often minor but causes contamination, burning smell, and in the long run oil starvation.
Symptoms: Oil film or oil smell in engine bay, visible oil loss at the front of the engine, slightly falling oil level
Vehicle Weaknesses 4
The Hydractive 3 suspension on the C5 I is a known money pit at higher mileages. Spheres lose their nitrogen charge and the ride becomes hard and uncomfortable. Leaking cylinders or a failed hydraulic block leads to complete failure and expensive replacement.
The BSI central control unit in the C5 I is notorious for complete failures in which fault messages for the immobiliser, gearbox, brakes, ABS and ESP appear simultaneously. Moisture in the ECU or corrosion at earth points are the most common causes.
Tie rods and tie rod ends on the C5 I have below-average durability. MOT reports document elevated tie rod wear as one of the most common defects on this model. Driveshafts and joints also show premature wear.
Vehicles from the early production years (2001–2004) show corrosion problems on the underfloor and front subframe. Brake lines and subframe welds rot through, especially in areas where road salt is used.
