Piezo injectors (2009–2011)
usually 60,000–140,000 km · High risk
Signs: Rough running, knocking, no-start
Fix: Replace injectors (check campaign)
€1,000–2,500
Common faults, service intervals and costs
Infiniti Q50
2013–2023
2
engines covered
5
known faults
2,476
roadworthiness tests in the statistics
Enter your VIN and mileage and get a plan built for your exact engine and gearbox.
The Infiniti Q50 was built from 2013 to 2023.
For this generation we cover 2 engines and 5 known faults, each with the mileage range where it usually appears.
The most expensive known risk is Timing chain stretch: it usually appears at 150,000–250,000 km and costs €1,500–3,000 to fix.
In UK roadworthiness tests in 2024, at 100–150 thousand km this model most often failed on: tyres and wheels (8.6 %), brakes (8.0 %), suspension (6.7 %). It fails more often than an average car of the same age and mileage on: brakes. It fails less often than average on: lights, wipers and visibility, body and corrosion, exhaust, emissions and leaks.
Engines
| Engine | Fuel | Timing drive | Oil |
|---|---|---|---|
| 2.1 CDI (Mercedes OM651) | Diesel | Chain | 5W-30 · MB 229.51 / 229.52 · ~6.5 L · every 15,000 km |
| 1.6 / 2.0 petrol (Mercedes M274) | Petrol | Chain | 5W-30 · MB 229.5 · ~5.8 L · every 15,000 km |
Faults by engine
2.1 CDI (Mercedes OM651)
Timing chain stretch
usually 200,000–280,000 km · Medium risk
Signs: Correlation codes, rattle
Fix: Replace chain
€1,200–2,200
EGR / DPF
usually 150,000–220,000 km · Medium risk
Signs: Limp mode, DPF light
Fix: Clean or replace
€300–1,500
1.6 / 2.0 petrol (Mercedes M274)
Camshaft adjuster solenoid oil leak
usually 60,000–140,000 km · Medium risk
Signs: Oil in the wiring plug, check-engine light
Fix: Replace solenoids, check the harness
€200–500
Timing chain stretch
usually 150,000–250,000 km · High risk
Signs: Cold-start rattle
Fix: Replace chain and adjusters
€1,500–3,000
Gearboxes
Automatic (torque converter)
Torque converter / valve body
usually 150,000–250,000 km · Wear part
Signs: Delayed or harsh shifts
Fix: Fluid service, repair
€300–2,500
Scheduled service
Intervals and typical prices for the 2.1 CDI (Mercedes OM651) engine. Other engines differ in oil, timing drive and some filters; the app gives the exact plan.
| Item | Interval | Typical price |
|---|---|---|
| DPF health check (soot / ash load)Emissions | every 20,000 km | €0–60 |
| Engine oil + oil filterEngine | every 15,000 km or every 12 months | €70–150 |
| Cabin (pollen) filterClimate | every 15,000 km or every 12 months | €15–40 |
| Brake fluidBrakes | every 24 months | €50–95 |
| A/C service (regas + desiccant)Climate | every 24 months | €70–150 |
| Air filterEngine | every 30,000 km or every 24 months | €15–45 |
| Fuel filterFuel | every 30,000 km or every 24 months | €40–110 |
| Automatic transmission fluidTransmission | every 90,000 km | €200–450 |
| Glow plugsEngine | every 100,000 km | €120–300 |
| Auxiliary (serpentine) beltEngine | every 120,000 km | €70–180 |
| Coolant replacementCooling | every 150,000 km or every 96 months | €70–150 |
| Timing chain inspection (listen on cold start)Engine | every 150,000 km | €0–120 |
| Front brake padsBrakes | usually at 30,000–60,000 km | €60–150 |
| Front brake discs + padsBrakes | usually at 60,000–120,000 km | €150–320 |
| Rear brake padsBrakes | usually at 50,000–90,000 km | €50–130 |
| Tyres (set of 4)Wheels | usually at 40,000–60,000 km | €320–700 |
| Wiper bladesBody | checked at service | €20–50 |
| 12V batteryElectrical | checked at service | €100–220 |
Roadworthiness tests by mileage
Share of tests in the United Kingdom (DVSA MOT, 2024) that this model failed because of each system. Bold red means more often and green less often than an average car of the same age and mileage. Sample: 2,476 tests.
| thousand km | 50–100 | 100–150 | 150–200 |
|---|---|---|---|
| Brakes | 6.5 % | 8.0 % | 10.2 % |
| Suspension | 3.6 % | 6.7 % | 7.9 % |
| Steering | 0.1 % | 0.2 % | 0.2 % |
| Tyres and wheels | 6.2 % | 8.6 % | 9.5 % |
| Lights, wipers and visibility | 5.3 % | 6.3 % | 10.9 % |
| Body and corrosion | 1.3 % | 0.9 % | 0.7 % |
| Exhaust, emissions and leaks | 1.3 % | 1.7 % | 1.4 % |
Most common engine versions in the EU
New cars of this generation registered in the EU, Iceland and Norway 2010–2025: 11,353, of which 24 in Croatia. The share shows how common each version is.
| Version | Share | Years | CO₂ | Fuel use |
|---|---|---|---|---|
| 2.1 CDI (Mercedes OM651)2.1 (2,143 cm³) · 125 kW (170 hp) · Diesel | 41.8 % | 2013–2019 | 120 g/km | — |
| 2.1 CDI (Mercedes OM651)2.1 (2,143 cm³) · Diesel | 28.7 % | 2013–2018 | 119 g/km | — |
| 3.5 Petrol3.5 (3,498 cm³) · 225 kW (306 hp) · Petrol | 12.6 % | 2013–2020 | 185 g/km | — |
| 1.6 / 2.0 petrol (Mercedes M274)2.0 (1,991 cm³) · 155 kW (211 hp) · Petrol | 8.5 % | 2014–2019 | 188 g/km | — |
| 3.5 Hybrid3.5 (3,498 cm³) · 225 kW (306 hp) · Hybrid | 3.3 % | 2015–2020 | 215 g/km | — |
| 3.5 Petrol3.5 (3,498 cm³) · Petrol | 1.2 % | 2013–2018 | 151 g/km | — |
Source: European Environment Agency (EEA), monitoring of CO₂ emissions from new passenger cars, CC BY 4.0. CO₂ and fuel use are official type-approval values (WLTP from 2021), not real-world consumption.
Owner complaints in the US
Which systems owners reported to the US agency NHTSA and at what mileage. Complaints are not confirmed faults and some relate to recalls. Sample: 287 complaints.
Common questions
Does the Infiniti Q50 have a timing chain or a timing belt?
2.1 CDI (Mercedes OM651): chain; 1.6 / 2.0 petrol (Mercedes M274): chain.
What are the known problems with the Infiniti Q50?
The faults with the highest risk: timing chain stretch (150,000–250,000 km, €1,500–3,000); piezo injectors (2009–2011) (60,000–140,000 km, €1,000–2,500); EGR / DPF (150,000–220,000 km, €300–1,500); camshaft adjuster solenoid oil leak (60,000–140,000 km, €200–500). The full list by engine is on this page.
What does the Infiniti Q50 most often fail its roadworthiness test on?
In UK roadworthiness tests in 2024, at 100–150 thousand km this model most often failed on: tyres and wheels (8.6 %), brakes (8.0 %), suspension (6.7 %). It fails more often than an average car of the same age and mileage on: brakes. It fails less often than average on: lights, wipers and visibility, body and corrosion, exhaust, emissions and leaks.
What should you check when buying a used Infiniti Q50?
Before you buy, ask an authorised dealer to check by VIN whether the car has any open recalls. On the test drive, watch for these signs: cold-start rattle; rough running, knocking, no-start. The full checklist is in the guide to buying a used car.
Other generations
Models with the same engines
These models share engines with this car, so they share some of its faults too.
Mercedes-Benz C-Class (W205) 2014–2021Mercedes-Benz C-Class (W204) 2007–2014Mercedes-Benz E-Class (W212) 2009–2016Mercedes-Benz A-Class (W176) 2012–2018Mercedes-Benz E-Class (W213) 2016–2023Mercedes-Benz GLC (X253) 2015–2022Mercedes-Benz CLA (C117) 2013–2019Mercedes-Benz GLA (X156) 2013–2020
Sources and notes
Faults, intervals and prices are indicative and collected from public sources and owner experience; always rely on the service book and a qualified workshop. Test statistics: DVSA – Anonymised MOT tests and results, Open Government Licence v3.0. Dutch tests: RDW Open Data (CC0). Engine versions: EEA, monitoring of CO₂ emissions from new passenger cars (CC BY 4.0, DG CLIMA). Owner complaints: NHTSA ODI (public domain). Recalls: DVSA Vehicle Safety Branch Recalls Database, OGL v3.0. Brand and model names are trademarks of their owners and are used only to describe the vehicles.
Updated 08/10/2026