The 2016 Q50 shares Nissan's problematic steer-by-wire system and suffers from catastrophic engine failures on the 2.0T, plus transmission cooler leaks and control arm bushing deterioration. The 3.5L hybrid and 3.7L V6 are more reliable, but the 2.0T and early 3.0TT require serious scrutiny.
2.0L Turbo Catastrophic Engine Failure (Mercedes M274 engine)
Occasional · high severityTypical onset: 60,000-90,000 mi
Symptoms: Metal shavings in oil, Knocking or ticking noise from lower end, Sudden loss of oil pressure, Check engine light with misfire codes, Complete engine seizure
Fix: Connecting rod bearings fail, leading to spun bearings and destroyed crankshaft. Requires complete engine replacement or full rebuild with new crank, rods, bearings, and often pistons. 18-25 hours labor for engine R&R plus machine work.
Estimated cost: $8,000-15,000
Direct Adaptive Steering (DAS) Failure
Common · high severityTypical onset: 40,000-80,000 mi
Symptoms: Steering warning light, Loss of power steering assist, Steering wheel won't center, Harsh steering feel or complete lockup, Multiple steering-related fault codes
Fix: The steer-by-wire system has multiple failure points: steering ECU, actuator motor, or clutch assembly. Infiniti extended warranty to 7yr/100k on some units after recall. Replacement of steering control unit is 3-4 hours, full column assembly is 6-8 hours.
Estimated cost: $2,500-5,000
Transmission Oil Cooler Line Leaks
Common · medium severityTypical onset: 50,000-100,000 mi
Symptoms: ATF dripping from front of vehicle, Transmission running hot, Burning smell, Low transmission fluid warnings, Puddles under car after parking
Fix: The cooler lines at the radiator corrode and develop leaks, mixing coolant with ATF or leaking externally. Requires cooler line replacement and often radiator replacement if cross-contamination occurred. Flush transmission if contaminated. 3-5 hours labor.
Estimated cost: $800-1,800
Front Lower Control Arm Bushing Failure
Common · low severityTypical onset: 60,000-90,000 mi
Symptoms: Clunking over bumps, Wandering steering, Uneven tire wear on inside edge, Vehicle pulls to one side, Harsh ride quality
Fix: The front lower control arm bushings deteriorate prematurely, causing play in suspension. Infiniti bushings are not serviceable separately—requires complete control arm replacement both sides. 2.5-3.5 hours labor for both sides plus alignment.
Estimated cost: $1,200-1,800
3.0L Twin Turbo Oil Consumption
Occasional · medium severityTypical onset: 30,000-70,000 mi
Symptoms: Low oil light between changes, Blue smoke on startup, Fouled spark plugs, Requires 1+ quart every 1,000 miles, Carbon buildup on intake valves
Fix: Early VR30 engines suffer from piston ring sealing issues. Requires engine teardown, new piston rings, valve cleaning, and often cylinder honing. 20-30 hours for proper fix. Some owners just live with it and add oil, but catalytic converter damage is a risk.
Estimated cost: $5,000-8,000
Transmission Mount Failure
Occasional · low severityTypical onset: 70,000-110,000 mi
Symptoms: Clunk when shifting from Park to Drive, Vibration at idle, Transmission seems to move excessively, Clicking noise during acceleration, Driveline shudder
Fix: The front transmission mount deteriorates, allowing excessive drivetrain movement. The mount is hydraulic and expensive. Replacement requires supporting the transmission and is 2-3 hours labor.
Estimated cost: $600-1,000
Fuel Pump Failure (Recall-related)
Occasional · high severitySymptoms: No start condition, Engine stalling at operating temperature, Loss of power under load, Engine cranks but won't fire, Fuel pressure sensor codes
Fix: Impeller in low-pressure fuel pump can deform and fail. Covered under recall but if out of window, requires fuel tank drop and pump replacement. 3-4 hours labor.
Estimated cost: $800-1,400
Buy only a 3.7L V6 with clean service records and completed recalls; all other engines carry significant risk of expensive failures before 100k miles.
AI-assisted summary drawn from NHTSA recall data, our labor-times database, and platform knowledge. Not a substitute for a pre-purchase inspection on a specific vehicle.