Dacia Logan MCV 0.9 TCe Mk2

The 0.9 TCe engine uses a plastic thermostat housing with a gasket that is known to deteriorate over time. When the seal fails, coolant leaks externally, often visible as wet spots around the front of the engine. If caught early, this is a straightforward repair: the thermostat housing and gasket cost around €30-80, with labor around €100-200. However, if the leak goes unnoticed, the resulting coolant loss can lead to overheating and potentially serious engine damage. This is widely reported across all vehicles using the H4B engine (Renault Clio IV, Captur, Dacia Sandero, Logan). Regular coolant level checks are the best prevention.

The H4B engine uses a timing chain rather than a belt, but the chain, guides, and tensioner do wear over time. Symptoms include a rattling noise on cold start that settles after a few seconds, and in advanced cases, an engine management light. The plastic chain guide rails can disintegrate, allowing the chain to skip teeth and potentially cause valve-to-piston contact. Poor oil maintenance significantly accelerates this issue. Typical onset is 120,000-150,000 km with regular servicing, but neglected engines can fail earlier. Chain kit replacement costs €800-1,200 at an independent shop; if the chain has skipped and damaged valves, engine replacement may be needed at €1,500-2,500 for a remanufactured unit.

The three-cylinder engine uses a single coil pack which can develop faults over time, leading to misfires, rough idle, and the engine management light illuminating. This is more commonly reported on pre-2016 engines. Replacement is straightforward: the coil pack costs €50-100, spark plugs €20-40 for a set of three, and labor is under an hour. Replacing both coil and plugs together is recommended. This is not a severe issue but causes drivability concerns until resolved.

The 0.9 TCe is fitted with a dual-mass flywheel and hydraulic clutch. Urban stop-start driving accelerates wear, and some owners report clutch judder and vibration developing between 60,000-100,000 km. A dealer-quoted clutch and flywheel replacement runs €800-1,200 including labor, though independent garages typically charge €600-900. Some owners opt for a single-mass flywheel conversion to reduce future replacement costs, though this increases pedal vibration slightly. Smooth driving and avoiding slipping the clutch in traffic extend its life considerably.

Some owners report the engine revving up and down on its own at idle, known as 'hunting.' This is typically caused by a vacuum leak in one of the boost hoses, a dirty throttle body, or occasionally a faulty idle control valve. Cleaning the throttle body costs under €100 at any garage. If a boost hose has perished, replacement is €50-150. In rare cases a software update from the dealer resolves the issue. The three-cylinder engine is inherently vibration-prone at idle, so some roughness is normal, but oscillating RPM should be investigated.

The Easy-R is an automated manual gearbox that uses a computer-controlled clutch actuator. It had serious reliability problems: early clutch failures at under 10,000 km were reported, along with jerky shifting, stalling at junctions, and complete gearbox immobilization. Dacia acknowledged the issues and the Easy-R was eventually discontinued. Clutch actuator replacement costs €500-800, and a full clutch replacement in the Easy-R runs €800-1,500 due to the additional actuator calibration. If buying an Easy-R-equipped car, budget for potential gearbox issues. Manual transmission versions of the Logan MCV are significantly more reliable.