✓ The faults of this engine were checked against sources (10/2026). Each item has at least two independent sources or an official recall or parts-maker technical note.
Con-rod bearing wear or spun bearing (early engines, to ~2010)
usually 100,000–250,000 km · High risk
model years 2001–2010 only
Signs: Knocking from the bottom end when warm, oil pressure warning; if ignored the crankshaft is damaged and the engine fails
Fix: On early engines change oil every 10,000-15,000 km with the correct spec; at the first knock stop driving and replace the con-rod bearings (preventive bearing change is common on high-mileage early cars)
€700–3,500
High-pressure pump sheds metal, damaging injectors (Delphi, to ~2011)
usually 80,000–200,000 km · High risk
model years 2001–2011 only
Signs: Hard starting or no start, misfire and smoke, rail pressure fault codes, several injectors failing at once
Fix: Check the fuel filter and the pump for metal particles; replace the pump and the contaminated injectors, rail and lines and flush the tank, otherwise new parts fail again
€1,200–3,000
Injector wear (high return flow, rough running)
usually 150,000–250,000 km · Medium risk
Signs: Hard hot starting, rough idle, black smoke, power loss, return flow out of tolerance on the test
Fix: Return-flow (leak-off) test and live-data correction check; recondition or replace the faulty injectors with new copper seals
€400–1,400
EGR valve coking
usually 80,000–200,000 km · Medium risk
Signs: Jerky idle, black smoke, power loss, EGR fault codes (e.g. P0401); worse with short town trips
Fix: Check EGR position in live data; clean the valve and intake, replace the valve if it sticks or its motor fails
€200–700
DPF clogging, failed regenerations
usually 80,000–200,000 km · Medium risk
Signs: DPF warning, frequent or interrupted regenerations, limp mode; mostly cars used for short trips
Fix: Check the differential pressure sensor and EGR first, then forced regeneration, cleaning or replacement; use low-ash RN0720 oil
€150–1,500
Turbocharger failure (oil supply, boost hose)
usually 120,000–250,000 km · Medium risk
Signs: Whistling, blue smoke, oil use, loss of power or limp mode (P0299 underboost)
Fix: First check boost hoses and clamps and the intercooler pipes; if the turbo has play, replace it and clean or replace the oil feed line and check oil pressure
€100–1,400
Premature timing belt failure (Mégane III / Scénic III, ~2009-2011)
usually 60,000–120,000 km · High risk
model years 2009–2011 only
Signs: Belt snaps or jumps well before the 160,000 km interval; the engine stops and valves are bent
Fix: On these cars ask a Renault dealer by VIN whether the service bulletin on the high-pressure pump / belt drive was done, and do not run the belt to 160,000 km; change it at 120,000 km or 6 years at the latest
€400–3,500