✓ 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.
Variable-geometry turbo or boost control fault (single-turbo versions)
usually 80,000–200,000 km · Medium risk
Signs: Loss of power, limp mode, underboost or overboost codes (P0299 / P0234), whistling
Fix: Check boost hoses, the vacuum or electric actuator and the pressure sensor first; free or replace the sticking vanes / turbo if the geometry is seized
€150–1,500
EGR valve clogging
usually 80,000–200,000 km · Medium risk
Signs: Jerky acceleration, power loss, engine light with EGR codes; worse with short town trips
Fix: Check EGR position in live data; clean the valve and intake or replace the valve if it sticks
€200–800
EGR cooler or EGR pipe cracks, exhaust smell in the cabin (mainly twin-turbo)
usually 60,000–200,000 km · Medium risk
Signs: Smell of exhaust in the cabin or engine bay, ticking or hissing leak, sometimes coolant loss
Fix: Find the leak with the engine running; replace the cracked EGR cooler or pipe and check with the dealer by VIN for any campaign on the EGR pipe
€400–2,000
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
€150–1,800
Injector faults (piezo injectors)
usually 100,000–250,000 km · Medium risk
Signs: Hard starting, rough idle, smoke, misfire, injector correction or rail pressure fault codes
Fix: Read injector corrections and do a return-flow test; replace the faulty injector(s) with new seals and code them to the ECU
€400–1,600
Timing chain stretch (rattle on cold start)
usually 100,000–200,000 km · Medium risk
Signs: Metallic rattle for a few seconds after a cold start, camshaft/crankshaft correlation codes; a jumped chain damages the valves
Fix: Keep to the oil spec and do not stretch oil intervals; at the first rattle replace the chain kit (chain, guides, tensioner, sprockets)
€1,000–2,000
Oil leaks at the timing cover or oil filter housing
usually 80,000–200,000 km · Wear part
Signs: Oil wetting at the front of the engine or around the filter housing, drops under the car
Fix: Find the source; reseal the timing cover or replace the oil filter housing gasket
€100–600
Emissions recall: NOx trap software (R9M Gen 2, Megane/Scenic/Espace/Talisman)
at any mileage · Wear part
model years 2015–2019 only
Signs: Usually none; the NOx trap loses efficiency through sulphur build-up, sometimes poorer performance
Fix: Have a Renault dealer check by VIN that the free ECU reprogramming was done
free / recall