Injector wear
usually 150,000–250,000 km · Medium risk
Signs: Rough idle, smoke
Fix: Replace injectors
€600–1,400
Common faults, service intervals and costs
Infiniti Q30 / QX30
2015–2019
3
engines covered
9
known faults
5,184
roadworthiness tests in the statistics
Enter your VIN and mileage and get a plan built for your exact engine and gearbox.
The Infiniti Q30 / QX30 was built from 2015 to 2019.
For this generation we cover 3 engines and 9 known faults, each with the mileage range where it usually appears.
The most expensive known risk is Crankshaft bearing wear: it usually appears at 180,000–280,000 km and costs €1,500–3,000 to fix.
In UK roadworthiness tests in 2024, at 50–100 thousand km this model most often failed on: lights, wipers and visibility (5.1 %), tyres and wheels (4.5 %), suspension (3.7 %). It fails less often than average on: brakes, tyres and wheels, lights, wipers and visibility, exhaust, emissions and leaks.
Engines
| Engine | Fuel | Timing drive | Oil |
|---|---|---|---|
| 1.5 dCi (K9K) | Diesel | Belt · 120,000 km / every 72 mo | 5W-30 · Renault RN0720 (DPF) / RN0710 · ~4.5 L · every 10,000 km |
| 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 M270) | Petrol | Chain | 5W-30 · MB 229.5 · ~5.8 L · every 15,000 km |
Faults by engine
1.5 dCi (K9K)
Crankshaft bearing wear
usually 180,000–280,000 km · High risk
Signs: Knock under load; worse on older engines
Fix: Keep oil changes at 10,000 km
€1,500–3,000
EGR / DPF
usually 120,000–200,000 km · Medium risk
Signs: Limp mode
Fix: Clean or replace
€250–1,200
2.1 CDI (Mercedes OM651)
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
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 M270)
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
Manual
Clutch wear
usually 120,000–200,000 km · Medium risk
Signs: Slipping, high bite point
Fix: Replace clutch kit
€500–900
Dual-mass flywheel
usually 150,000–220,000 km · Medium risk
Signs: Rattle at idle, vibration pulling away
Fix: Replace with clutch
€700–1,400
DCT (7-speed, wet)
DCT mechatronic / solenoids
usually 120,000–220,000 km · Medium risk
Signs: Harsh shifts
Fix: Repair; keep oil changes at 60,000 km
€800–2,000
Scheduled service
Intervals and typical prices for the 1.5 dCi (K9K) engine. Other engines differ in oil, timing drive and some filters; the app gives the exact plan.
| Item | Interval | Typical price |
|---|---|---|
| Engine oil + oil filterEngine | every 10,000 km or every 12 months | €70–150 |
| DPF health check (soot / ash load)Emissions | every 20,000 km | €0–60 |
| 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 |
| Glow plugsEngine | every 100,000 km | €120–300 |
| Auxiliary (serpentine) beltEngine | every 120,000 km | €70–180 |
| Timing belt kit + water pumpEngine | every 120,000 km or every 72 months | €450–900 |
| Coolant replacementCooling | every 150,000 km or every 96 months | €70–150 |
| Manual gearbox oilTransmission | every 150,000 km | €60–130 |
| 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: 5,184 tests.
| thousand km | 0–50 | 50–100 | 100–150 |
|---|---|---|---|
| Brakes | 1.8 % | 3.0 % | 3.8 % |
| Suspension | 0.9 % | 3.7 % | 5.0 % |
| Steering | 0.0 % | 0.1 % | 0.2 % |
| Tyres and wheels | 3.5 % | 4.5 % | 6.8 % |
| Lights, wipers and visibility | 4.8 % | 5.1 % | 6.6 % |
| Body and corrosion | 0.7 % | 0.3 % | 0.6 % |
| Exhaust, emissions and leaks | 0.2 % | 1.1 % | 1.5 % |
Most common engine versions in the EU
New cars of this generation registered in the EU, Iceland and Norway 2010–2025: 15,666, of which 35 in Croatia. The share shows how common each version is.
| Version | Share | Years | CO₂ | Fuel use |
|---|---|---|---|---|
| 1.5 dCi (K9K)1.5 (1,461 cm³) · 80 kW (109 hp) · Diesel | 29.3 % | 2015–2019 | 107 g/km | — |
| 2.1 CDI (Mercedes OM651)2.1 (2,143 cm³) · 125 kW (170 hp) · Diesel | 29.1 % | 2015–2019 | 152 g/km | — |
| 1.5 dCi (K9K)1.5 (1,461 cm³) · Diesel | 11.1 % | 2016–2018 | 108 g/km | — |
| 2.1 CDI (Mercedes OM651)2.1 (2,143 cm³) · Diesel | 8.8 % | 2016–2019 | 127 g/km | — |
| 1.6 / 2.0 petrol (Mercedes M270)1.6 (1,595 cm³) · 115 kW (156 hp) · Petrol | 8.1 % | 2016–2019 | 166 g/km | — |
| 1.6 / 2.0 petrol (Mercedes M270)1.6 (1,595 cm³) · 90 kW (122 hp) · Petrol | 5.0 % | 2016–2019 | 156 g/km | — |
| 1.6 / 2.0 petrol (Mercedes M270)1.6 (1,595 cm³) · Petrol | 3.4 % | 2016–2019 | 137 g/km | — |
| 1.6 / 2.0 petrol (Mercedes M270)2.0 (1,991 cm³) · 155 kW (211 hp) · Petrol | 2.6 % | 2016–2019 | 185 g/km | — |
| 1.6 / 2.0 petrol (Mercedes M270)2.0 (1,991 cm³) · Petrol | 1.3 % | 2016–2019 | 161 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.
Common questions
Does the Infiniti Q30 / QX30 have a timing chain or a timing belt?
1.5 dCi (K9K): belt · 120,000 km / every 72 mo; 2.1 CDI (Mercedes OM651): chain; 1.6 / 2.0 petrol (Mercedes M270): chain.
What are the known problems with the Infiniti Q30 / QX30?
The faults with the highest risk: crankshaft bearing wear (180,000–280,000 km, €1,500–3,000); 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); DCT mechatronic / solenoids (120,000–220,000 km, €800–2,000). The full list by engine is on this page.
What does the Infiniti Q30 / QX30 most often fail its roadworthiness test on?
In UK roadworthiness tests in 2024, at 50–100 thousand km this model most often failed on: lights, wipers and visibility (5.1 %), tyres and wheels (4.5 %), suspension (3.7 %). It fails less often than average on: brakes, tyres and wheels, lights, wipers and visibility, exhaust, emissions and leaks.
What should you check when buying a used Infiniti Q30 / QX30?
Before you buy, ask an authorised dealer to check by VIN whether the car has any open recalls. If the engine has a timing belt, ask for the invoice for its replacement: with no proof, assume it has not been done. On the test drive, watch for these signs: knock under load; cold-start rattle. 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 A-Class (W176) 2012–2018Mercedes-Benz CLA (C117) 2013–2019Mercedes-Benz GLA (X156) 2013–2020Mercedes-Benz B-Class (W246) 2011–2018Nissan Note E12 2013–2020Nissan Micra (K14) 2016–2023Nissan Pulsar 2014–2018Mercedes-Benz Citan (W415) 2012–2021
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