Generations
H15 — First Generation
2015–2019
1.5 dCi, 1.6 Turbo, 2.0 Turbo, 2.1 dCi
Top issues to watch for
The most serious Infiniti Q30 problems ranked by severity. We track 5 known issues — here are the ones you need to know about first.
Major
Premature brake disc wear (H15)
The Q30 suffers from accelerated brake disc wear compared to the fleet average, with MOT data showing failure rates 3.8 times higher than typical. This affects all engine variants but is most pronounced on the diesel models which see higher mileage use. The issue appears to be related to brake pad compound or disc metallurgy as both wear and fracture failures are documented.
What happens if ignoredSeverely worn or fractured brake discs reduce braking performance and can fail completely during emergency braking. Replacement of both discs and pads is typically required, with costs significantly higher than normal brake service intervals would suggest for a car of this age.
Independent garage
£200–£350
Specialist
£280–£450
Main dealer
£400–£650
Parts only
£120–£250
Major
Turbocharger actuator failure (H15)
The electronic turbocharger wastegate actuators on Q30 turbocharged engines (both petrol and diesel) can fail, causing loss of boost control. This is a common issue across the Mercedes-Renault engine family used in this platform. Symptoms include reduced power, engine management light activation, and potentially expensive turbocharger replacement if left unrepaired.
What happens if ignoredFailed turbocharger actuator causes significant power loss and can lead to complete turbocharger failure if the wastegate cannot control boost pressure properly. Replacement actuators cost several hundred pounds, while full turbocharger replacement can exceed £2000.
Independent garage
£300–£600
Specialist
£400–£800
Main dealer
£600–£1,200
Parts only
£200–£500
Minor
Suspension joint dust cover failure (H15)
The rubber dust covers protecting suspension ball joints and bushes deteriorate prematurely on the Q30, particularly on diesel variants which typically see higher mileage use. MOT data shows this model failing at 6.3 times the fleet average for missing dust covers and 5.1 times for severely deteriorated covers. Once the dust cover fails, contamination enters the joint leading to accelerated wear and eventual replacement of the entire component.
What happens if ignoredFailed dust covers allow dirt and water into suspension joints, accelerating wear. Left unrepaired, the joints themselves will fail requiring full component replacement at significantly higher cost. The car remains safe to drive but should be repaired to prevent more expensive failures.
Independent garage
£40–£80
Specialist
£60–£120
Main dealer
£100–£180
Parts only
£15–£35
Minor
Engine management light - emissions system (H15)
Diesel Q30 models show elevated rates of MOT failure for illuminated engine management lights, occurring at Given the Mercedes-Renault platform sharing, this is likely related to EGR valve carbon build-up or diesel particulate filter issues typical of this engine family.
What happens if ignoredAn illuminated engine management light indicates a fault in the emissions control system. The car may enter reduced power mode and will fail the MOT test. Diagnosis and repair costs vary widely depending on the specific fault but can involve expensive components like the DPF or EGR valve.
Independent garage
£80–£400
Specialist
£100–£500
Main dealer
£150–£800
Parts only
£50–£600
1 more known issues tracked
Including wear items, electrical niggles, and generation-specific problems.
MOT failure hotspots
Based on DVSA MOT test data. These are the items where the Infiniti Q30 fails at a significantly higher rate than the average car.
Light unit fault
Lights & Electrics · 80-100k miles
MOT failure rate: 27x the fleet average
Sample: 592 tests
Excessive fluctuation in brake effort through e...
Brakes · 60-80k miles
MOT failure rate: 7.3x the fleet average
Sample: 155 tests
Anti-roll bar links worn
Suspension · 100-120k miles
MOT failure rate: 7.2x the fleet average
Sample: 191 tests
Headlight fault
Lights & Electrics · 60-80k miles
MOT failure rate: 6.8x the fleet average
Sample: 1,963 tests
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Related
Infiniti Q30 reliability FAQs
What are the most common problems with the Infiniti Q30?
The Infiniti Q30 has 5 known issues across 2 severity levels. The most common problems relate to Premature brake disc wear (H15) and Turbocharger actuator failure (H15).
Is the Infiniti Q30 reliable?
The Infiniti Q30 has 0 dangerous and 2 major known issues. No dangerous issues are tracked, which is a positive sign.
How much does it cost to fix Infiniti Q30 problems?
Repair costs range widely. The most significant issue (Premature brake disc wear (H15)) costs £200–£350 at an independent garage. Minor issues can be under £200. Always get a full inspection before buying.