✓ 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.
Coolant vent line breaks at the cylinder head (to ~2019)
usually 50,000–150,000 km · Medium risk
model years 2015–2019 only
Signs: Sudden or intermittent coolant loss, low coolant or engine temperature warning, coolant under the front of the car
Fix: Check by VIN whether the service action was done; replace the vent line with the revised part (17 12 9 845 173) and bleed the system
€0–400
Oil filter housing cracks: coolant leak, oil in coolant
usually 80,000–180,000 km · High risk
Signs: Coolant loss or puddle, temperature warning, oily sludge in the expansion tank
Fix: Replace the housing (intake manifold usually comes off); if oil got into the coolant, flush the cooling system
€400–1,200
Water pump leak
usually 100,000–170,000 km · Medium risk
Signs: Coolant traces near the front subframe, high temperature warning, heater blows hot at full
Fix: Replace the pump insert, or the whole carrier if the carrier gasket leaks; keep the coolant level correct
€400–1,000
Valve cover gasket oil leak (check crankcase ventilation)
usually 100,000–200,000 km · Wear part
Signs: Oil film on top of the engine, burning oil smell, oil in the spark plug wells
Fix: Locate the leak with UV dye; replace the gasket and, if its membrane is worn, the crankcase ventilation separator
€250–800
Carbon deposits on intake valves (direct injection)
usually 100,000–200,000 km · Wear part
Signs: Rough idle, misfire codes, slight power loss and higher fuel use
Fix: Confirm with an endoscope, then clean the intake valves (walnut blasting)
€300–700