Infiniti's mid-size sport sedan for the European market, competing with the BMW 3 Series, Mercedes-Benz C-Class, and Lexus IS. The Q50 2.0t uses a Mercedes-Benz M274 turbocharged engine paired with a 7G-Tronic automatic gearbox, offering rear-wheel drive dynamics and generous standard equipment. The 2014-2020 range is the Western European sales window rather than a single Europe-wide production span: the Netherlands had already dropped the 2.0t by February 2019, Infiniti confirmed its Western European exit for 2020, and Ukrainian price lists still offered the Q50 2.0 in 2021. Western European buyers are therefore purchasing from a brand no longer actively selling in the region.· more· less
Proven Mercedes drivetrainStrong standard equipment levels
No Western European dealer network since 2020Parts sourcing can be slow and costly
Buy if: You want a distinctive sport sedan with a proven Mercedes engine and can accept limited European dealer support and lower resale values.
Avoid if: You need convenient access to specialists and parts or plan to resell within a few years.
Hydraulic tensioner loses oil pressure overnight, causing cold-start rattle and eventual chain slack · more· less
The M274 uses a dual-row timing chain that is fundamentally durable, but the hydraulic tensioner can weaken over time, especially with extended oil change intervals. Oil drains from the tensioner overnight, causing a metallic rattle lasting 5-30 seconds on cold start until oil pressure rebuilds. This typically appears after 120,000-150,000 km on cars with strict maintenance, but can occur earlier on cars where oil changes were deferred. If ignored, chain slack can cause cam-crank correlation codes (P0016/P0017) and eventually valve contact. Repair requires replacing the chain, guides, tensioner, and sprockets as a complete assembly. Independent specialist cost is around €1,200-1,500; Nissan dealer pricing runs €1,500-1,800. Using only MB 229.5 or 229.51 specification oil and changing it every 15,000 km or annually significantly reduces this risk.
Thermostat housing failure
€300 - 5002 of 8
Plastic thermostat housing gasket deteriorates, causing coolant leak and overheating risk · more· less
The M274 thermostat housing is a common weak point across all vehicles using this engine. The gasket fails before the thermostat element itself, causing a slow coolant leak that can be difficult to spot initially. Symptoms include low coolant warnings, slight overheating at idle, and white residue around the housing area. This can occur at any mileage but is commonly reported between 60,000-120,000 km. The fix involves replacing the complete OEM housing assembly. Part cost is around €150-250 and labor is straightforward at 1-2 hours. Total repair at an independent specialist runs €300-400; at a Nissan dealer around €400-500. Fault codes P0128 and P0597 are commonly associated with this failure.
Brake master cylinder failure (2014-2016)
€1,000 - 1,6003 of 8
Internal seals in the master cylinder deteriorate prematurely, causing spongy brake pedal and reduced stopping power · more· less
The 2014-2016 Q50 models have a documented brake master cylinder weakness. The internal seals degrade sooner than expected, causing the brake pedal to feel progressively spongier as internal leaking worsens. This is a safety-critical issue that increases stopping distances. Many owners report the problem appearing between 60,000-120,000 km, though some experienced it earlier. The only solution is a complete master cylinder replacement. The part costs approximately €400-600 and labor runs 2-3 hours. Total repair is €1,000-1,600 depending on parts sourcing (Infiniti-specific parts can have longer lead times in Europe). This issue primarily affects 2014-2016 model years; 2017 and later Q50s show a much lower failure rate.
Turbo wastegate actuator wear
€500 - 2,5004 of 8
Wastegate pivot arm corrodes or sticks, causing rattle and erratic boost control · more· less
The M274 turbocharger wastegate actuator can develop corrosion and wear on the pivot arm, particularly after 80,000-120,000 km. Symptoms include a distinct rattling noise on cold start or deceleration, intermittent power loss, and diagnostic codes P0299 (underboost) or P0234 (overboost). If caught early, the wastegate actuator can be repaired with a repair kit for approximately €500-800. However, Infiniti does not sell the actuator separately from the turbocharger assembly, so if the turbo internals are also damaged, full turbo replacement runs €1,500-2,500. The intercooler silicon hoses also crack from heat cycling over time and should be inspected as they can mimic boost-related symptoms.
PCV valve failure (P052E)
€300 - 5505 of 8
Crankcase ventilation valve fails, causing rough idle and check engine light · more· less
The PCV (Positive Crankcase Ventilation) valve on the M274 is a common failure point. When it fails, the engine management light illuminates with code P052E, and the engine may idle roughly or stall. The plastic hoses in the PCV assembly become brittle from engine heat over time, and during replacement they frequently crack, so many specialists recommend replacing the entire PCV assembly rather than just the valve. The part costs €150-300 and labor is 1-2 hours. Total repair runs €300-550. There is no Infiniti warranty extension for this item on the Q50, unlike some Mercedes models that received goodwill coverage.
Direct Adaptive Steering malfunction (if equipped)
€1,000 - 5,0006 of 8
Steer-by-wire system can lose assist or alter steering response unexpectedly · more· less
Some European Q50s were equipped with Infiniti's Direct Adaptive Steering (DAS), a steer-by-wire system that uses electric motors and sensors instead of a direct mechanical connection. When functioning correctly it offers adjustable steering feel, but failures are expensive. Symptoms include sudden loss of steering assist, the system defaulting to rigid backup mechanical mode, off-center steering wheel, and multiple warning lights. A European software recall covering DAS-equipped V37 cars built between 13 December 2012 and 18 December 2015 addressed ECU calibration that could alter steering responsiveness after low-battery starts. Beyond the recall fix, hardware failures of the steering column assembly or ECU can cost €1,000-5,000 for parts and the mandatory dealer-level calibration. Q50s without DAS use conventional hydraulic power steering and are not affected by this issue.
InTouch infotainment system failure
€200 - 1,0007 of 8
Dual-screen InTouch system suffers from black screens, freezing, and reboot loops · more· less
The Q50's dual-screen InTouch infotainment system is a known weak point. The upper and lower touchscreens can go black, freeze during navigation, or enter reboot loops. Many cases are caused by a corrupted internal microSD card rather than a hardware defect. A DIY microSD card replacement and firmware reflash can resolve many issues for under €50. However, if the display control unit (DCU) itself has failed, replacement costs €500-1,000. Bluetooth audio dropouts and navigation map freezes are common software-level irritations that can sometimes be resolved with a soft reset (holding the power knob for 10 seconds). Check that both screens respond properly during the test drive.
Excessive oil consumption
€500 - 6,0008 of 8
M274 can develop excessive oil consumption, particularly with short-trip driving patterns · more· less
The M274 engine is known to consume oil, with many owners reporting 0.5-1.0 litre per 5,000 km as normal. What matters on a used car is whether consumption is stable and documented: a rate that climbs over time, or one beyond roughly 1 litre per 2,000 km, points to wear rather than engine character and brings carbon buildup, misfires, and fouled plugs with it. Mild cases can be managed with more frequent oil top-ups (€500 in additional oil costs over ownership). A long-neglected case that damages pistons or bores can require short-block replacement at €4,000-6,000. Monitor oil level closely between services and keep records of consumption rates.
Reliable drivetrain, but orphan brand status adds ownership friction
The Mercedes-Benz M274 engine and 7G-Tronic gearbox are proven components used across millions of vehicles and can reach 300,000+ km with strict maintenance. Known mechanical weak points are the thermostat housing, PCV valve, and at higher mileages the timing chain tensioner. The brake master cylinder on 2014-2016 models is a documented early failure point. The main ownership challenge is Infiniti's Western European withdrawal in 2020: parts may take longer to source, specialist knowledge is rarer, and many engine-side components can be cross-referenced to Mercedes equivalents, which helps availability. Nissan dealers handle after-sales obligations but may lack Q50-specific experience.
Service history
Complete Infiniti dealer, Nissan, or specialist records essential. Verify oil changes every 15,000 km or annually with MB 229.5/229.51 specification oil.
Tires
Check tread depth, age (date codes), and uneven wear patterns. Rear tires wear faster on this rear-wheel drive car.
Cold start
Must start the engine completely cold. Listen for unusual sounds during the first 30 seconds.
Test drive
Minimum 30 minutes including varied speeds and spirited acceleration to test turbo response and gearbox behavior.
Specific for this vehicle
Listen for timing chain rattle on cold start
A metallic rattle lasting more than a few seconds on cold start indicates tensioner wear. This is the most important mechanical check.
Inspect thermostat housing and coolant level
Check for white residue around the thermostat housing area. Low coolant level or frequent top-ups indicate a leak.
Test brake pedal firmness (especially 2014-2016)
Press the brake pedal firmly when stationary. A spongy or sinking pedal suggests master cylinder seal failure.
+ 4 more checksShow less
Check turbo boost response under acceleration
During the test drive, accelerate firmly from low speed. Hesitation, power loss, or unusual whistling can indicate wastegate or boost leak issues.
Confirm recall status against the VIN
Campaigns published under the Q50 name are variant- and equipment-specific, so ask a Nissan dealer to run this exact VIN. On a DAS-equipped car, confirm the steering software campaign was carried out.
Test both InTouch screens thoroughly
Navigate through all menus on both screens. Check for black screens, freezing, and slow response. Test Bluetooth connectivity.
Check oil level and ask about consumption
Check the dipstick level and ask the owner about oil consumption between services. Excessive consumption warrants a compression test.
Recalls and Technical Service Bulletins
Direct Adaptive Steering software update, DAS-equipped V37 built 13 December 2012 - 18 December 2015Verify completed
Infiniti ceased Western European operations in early 2020. Campaigns published under the Q50 name are variant- and equipment-specific, so confirm them against the VIN rather than the model name. Contact the nearest Nissan dealer with the VIN to check which campaigns applied to this car and whether they were completed. Nissan handles Infiniti after-sales obligations in Europe.
Warranty Status
Factory warranty (3 years / 100,000 km)Expired on all used Q50s
After-sales supportHandled by Nissan dealers since 2020
Extended warranty availabilityNo official Infiniti extended warranty program in Europe
All European Q50 2.0t models are outside their original 3-year / 100,000 km factory warranty. Since Infiniti withdrew from Western Europe in early 2020, after-sales service, warranty claims, and recalls are handled through the Nissan dealer network. M274 engine components can often be cross-referenced to Mercedes-Benz part numbers, which helps availability.
Sources: Research draws on model-specific owner forums and owner communities, recall information from official authorities, German automotive press, and multiple workshop cost references cross-checked against each other.
This report is for informational purposes only and does not constitute professional advice. Estimates may be inaccurate. Always have a qualified specialist inspect the vehicle before purchase. We accept no liability for decisions made based on this information.
