Infiniti Q30 2.2d H15

2015-2019Last updated: August 2026 · How this report is builtAugust 2026

2015-2019 · 2.2d (170 PS / 125 kW) OM651 4-cylinder turbodiesel

Infiniti Q30 2.2d H15 — Render © Car Checker

A premium compact hatchback built in Sunderland on the Mercedes-Benz MFA platform, sharing its OM651 diesel engine and 7G-DCT dual-clutch gearbox with the A-Class W176 and GLA X156. Infiniti positioned the Q30 as a distinctive alternative to the usual German compact premium offerings, with bold styling and a comfortable, well-equipped cabin. Production ended in 2019 when Infiniti withdrew from Western Europe.· more· less

Mercedes powertrain, parts widely available Comfortable ride and generous equipment

Infiniti-specific parts increasingly scarce DCT clutch wears fast in city use

Buy if: You want a comfortable diesel hatchback with proven Mercedes mechanicals and can accept that Infiniti-specific parts may require creative sourcing.

Avoid if: You need a reliable dealer network for servicing or mostly drive short urban trips, which accelerates both dual-clutch and DPF wear.

Maintenance costs

€950 – €1,800/year

at 15,000 km/year

Fixed costsservice, tyres, brakes €550 – €950 /yr

Risk bufferunplanned repairs €400 – €850 /yr

Price estimates are based on German asking prices. Prices and costs vary by vehicle condition and location.

Maintenance costs

€950 – €1,800 per year

€550 – €950

service, tyres, brakes

€400 – €850

repair buffer

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Buying a used Infiniti Q30? Check its history.

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Common Problems

7G-DCT dual-clutch gearbox wear

€900 - 3,0001 of 7

Wet dual-clutch packs wear faster on diesel models due to high torque, especially in urban driving · more· less

The Q30 2.2d uses the Mercedes 7G-DCT (724.0) dual-clutch transmission exclusively. Diesel torque accelerates clutch wear significantly compared to petrol models. In primarily urban stop-and-go driving, clutch packs commonly wear between 70,000 and 100,000 km. Symptoms include jerky engagement from standstill, vibrations between 20 and 40 km/h, gear slipping between 2nd and 4th gears, and transmission fault warnings. Highway-biased driving extends clutch life to 140,000-180,000 km. Clutch pack replacement costs €900-1,700. If the mechatronics unit (hydraulic control unit) also fails due to solenoid malfunction or pressure regulation issues, costs reach €1,200-3,000. Transmission oil changes every 60,000 km with MB 236.21 specification fluid are essential but often neglected. Over 70% of faulty units in specialist data had never received an oil change in their first 100,000 km.

OM651 timing chain stretch

€1,500 - 2,5002 of 7

Single-row simplex chain at the rear of the engine stretches over time, requiring expensive labor-intensive replacement · more· less

The OM651 uses a single-row (simplex) timing chain mounted at the rear of the engine, against the firewall in the Q30's transverse installation. This design makes replacement far more labor-intensive than a front-mounted chain. The successor OM654 also uses a simplex chain, so the improvement there is not a heavier chain but the wider service access of its revised layout. Chain stretch typically manifests between 100,000 and 150,000 km, earlier with irregular oil changes. The key symptom is a metallic rattle on cold start lasting 1-3 seconds. Camshaft adaptation values above 5 degrees on diagnostic scan indicate the chain needs replacement; above 8 degrees means failure is imminent. Parts cost approximately €300-500 for chain, tensioner, guides, and sprockets, but labor runs 8+ hours due to rear access, bringing total cost to €1,500-2,500. Ignoring this leads to chain skip and catastrophic valve-piston contact.

Infiniti-specific parts scarcity

€200 - 2,5003 of 7

Infiniti ended European commercial operations on 31 March 2020 and some brand-specific parts are reported as unavailable · more· less

While the Q30's powertrain parts (OM651 engine, 7G-DCT gearbox) are all Mercedes-sourced and widely available, Infiniti-specific components pose a growing challenge. Documented cases include electronic steering control units with no European stock and months-long waits for parts ordered from Japan. Coil springs have also proved difficult to source under Infiniti part numbers, though owners have found that Mercedes A-Class W176 and GLA X156 equivalents fit (for example OEM numbers A2463211204 or A2463211304 for front springs). Nissan maintains a legal obligation to supply parts, but in practice certain electronic modules and body-specific components may require sourcing from breakers, US dealers, or cross-referencing to Mercedes part numbers. This risk applies specifically to non-powertrain components: body panels, infotainment modules, Infiniti-specific electronics, and interior trim.

EGR valve and intake carbon buildup

€400 - 8004 of 7

Carbon deposits clog the EGR valve and intake manifold, causing rough idle and reduced power · more· less

The OM651 produces significant soot, making the EGR system highly susceptible to carbon fouling. Short-trip urban driving accelerates the buildup because exhaust temperatures remain too low to burn off deposits. Symptoms include rough idling, hesitation under load, reduced fuel economy, and the P0401 diagnostic code. The EGR valve is located at the rear of the engine against the firewall, making access difficult and labor-intensive. Simply replacing the valve often does not resolve the issue long-term; a thorough cleaning of the entire EGR path including the cooler and intake manifold ports is necessary. EGR valve replacement costs €400-600, with an additional €200-400 for comprehensive intake cleaning. Regular motorway driving helps prevent buildup.

Diesel injector seal leak

€300 - 1,5005 of 7

Copper sealing washers degrade, allowing combustion gases to leak and create carbon deposits around injectors · more· less

Known in Mercedes circles as 'black death,' this occurs when the copper sealing washers under the fuel injectors deteriorate from heat and pressure cycles. Once the seal fails, combustion gases escape past the injector and create heavy black carbon deposits that can eventually seize the injector in its bore. Symptoms include a strong diesel smell in the engine bay, rough idle, longer cranking on cold starts, and visible black tar-like deposits around injector seats. If caught early (resealing with new copper washers and stretch bolts), cost is €300-400 per injector. If carbon has seized an injector, specialist extraction tools or techniques are required, pushing costs to €800-1,500 per injector. The copper washers and hold-down stretch bolts are one-time-use parts.

DPF clogging and regeneration failure

€300 - 2,0006 of 7

Short urban trips prevent passive DPF regeneration, leading to soot accumulation and warning lights · more· less

The Q30's positioning as a premium compact means many are used for shorter urban journeys, which is the worst-case scenario for DPF health. Passive regeneration requires sustained motorway speeds to generate sufficient exhaust temperature. When the filter becomes overly loaded, forced regeneration at a garage costs €100-200. Repeated forced regenerations indicate a deeper issue, and DPF replacement costs €1,000-2,000. Additive DPF cleaner every 10,000 km can help maintain filter condition. Cars with a history of primarily motorway use will have far fewer DPF concerns.

Fuel filter housing coolant leak

€300 - 6007 of 7

The integrated fuel filter housing develops coolant leaks from cracked seals or housing distortion · more· less

The OM651's fuel filter housing has coolant passages running through it and is bolted to both the cylinder head and the intake manifold. Boost pressure from the turbo causes the manifold to flex, stressing the housing seals over time. Mercedes released an updated housing design to address this. Symptoms include the coolant warning light with no visible external leak, gradual coolant loss, and occasionally a sweet smell from the engine bay. Repair requires removal of the EGR cooler and replacement of its gasket alongside the housing, making it more labor-intensive than the part cost suggests. Parts cost approximately €100-200 with labor of €200-400.

Sound Mercedes mechanicals, but Infiniti's exit from Europe adds real risk

The OM651 diesel and 7G-DCT gearbox are proven across millions of Mercedes vehicles, and powertrain parts remain widely available through Mercedes suppliers. However, Infiniti ended its European commercial operations on 31 March 2020, and although authorised servicing, warranty repairs and genuine-parts supply continued after that date, Infiniti-specific components (electronic modules, body panels, interior trim) may be unavailable or subject to months-long waits. Any repair involving Infiniti-unique parts may require sourcing from breakers or overseas dealers. The 7G-DCT demands regular oil changes and struggles with constant urban stop-and-go driving. Prioritize examples with complete service history and motorway-biased use.

Pre-Purchase Inspection Checklist

Viewing checklist for the Infiniti Q30 2.2d H15

A printable one-page A4 checklist for this model.

General checks

Service history
Complete records are essential. With no Infiniti dealer network in Europe, look for Mercedes specialist, Nissan dealer, or independent garage records. Verify oil changes at correct intervals.
Tires
Check tread depth, age (date codes), and uneven wear patterns. 235/50R18 is the standard size on 18-inch wheels.
Cold start
Must start the engine completely cold. Listen carefully for any metallic rattling in the first 30 seconds.
Test drive
Minimum 30 minutes including city stop-and-go and motorway driving. Get the gearbox up to full operating temperature.

Specific for this vehicle

Listen for OM651 timing chain rattle on cold start
A metallic rattle lasting 1-3 seconds on cold start indicates timing chain stretch. This is the most important engine check. Request a diagnostic scan for camshaft adaptation values.
Test 7G-DCT in stop-and-go traffic
Drive for at least 15 minutes in slow city traffic. Feel for jerky engagement from standstill, vibrations between 20-40 km/h, hesitation, or any gearbox warning messages.
Inspect injector area for black carbon deposits
Remove the engine cover and check around the injector seats for black tar-like buildup. This indicates seal leaks and potential 'black death' issue.

+ 4 more checksShow less

Check coolant level and condition
Low coolant with no visible leak suggests fuel filter housing or internal leak. Brown or milky coolant indicates contamination.
Verify every listed recall has been completed
Contact a Nissan dealer with the VIN. Six UK campaigns cover airbags, seatbelts and the gear indicator, and a separate EU Safety Gate campaign covers a defective joint on 2016 and 2017 cars. All should show as completed for this VIN.
Check coil springs for cracks
Front and rear coil spring failures are reported, with replacement parts hard to source under Infiniti numbers. Check for broken or cracked springs. Mercedes A-Class equivalents can be used.
Check DPF regeneration history via OBD scan
Request a diagnostic scan showing DPF soot load and regeneration history. Frequent forced regenerations or high soot levels indicate a car that has been used mainly for short trips.

Recalls and Technical Service Bulletins

Driver's airbag may deploy unintentionally due to steering column grounding (R/2017/293) Verify completed

Airbag control unit incorrectly programmed, restraint system may not activate (R/2017/083) Verify completed

Passenger airbag inflator chemical mix incorrect, may not deploy (R/2016/301) Critical - verify completed

Front seat belt anchorage may be incorrectly positioned (R/2016/228) Critical - verify completed

Rear seat belt buckle nuts may not be fully secure (R/2016/227) Verify completed

Gear shift indicator may not display correctly (R/2018/382) Verify completed

Defective joint that could cause loss of manoeuvrability, EU Safety Gate alert A12/01099/21, campaign PG1CF, covering H15 Q30 and QX30 vehicles produced in 2016 and 2017 (applicability is VIN-specific) Verify completed

Infiniti ended its European commercial operations on 31 March 2020, but authorised Infiniti servicing, warranty repairs and genuine-parts supply continued after that date. Contact a Nissan dealer with the VIN to verify all recalls have been completed. The airbag and seatbelt recalls are safety-critical. National vehicle authorities (such as the DVSA in the UK or KBA in Germany) may also be able to confirm recall status.

Warranty Status

Factory warranty (3 years) Expired on all Q30 models

Rust perforation warranty 12 years from first registration in mainland European markets. In the UK, perforation cover sat inside the three-year comprehensive warranty and has expired

After-sales service Available through Nissan dealers and independent Mercedes specialists

All Infiniti Q30 models are well outside their original factory warranty. No extended warranty program exists from Infiniti in Europe. Third-party warranty providers may offer coverage, but verify that they cover the specific Mercedes-sourced powertrain components (OM651 engine, 7G-DCT gearbox) and the Infiniti-specific parts. Servicing is available through Nissan dealers or any independent Mercedes specialist, as the powertrain is identical to Mercedes models.

↔ Also consider

Infiniti Q30 1.5d H15 2015-2019

Smaller K9K diesel is generally more durable with fewer expensive failure modes. Same 7G-DCT gearbox concern applies if equipped with the automatic.

Mercedes-Benz A200 CDI W176 2012-2018

Same OM651 engine and 7G-DCT gearbox on the same platform. Mercedes dealer network and parts availability make ownership significantly easier.

BMW 120d F20 2011-2019

Pre-2015 N47 engine has severe timing chain risk. Post-2015 B47 is more reliable. Better dealer support but generally higher running costs.

Infiniti Q50 2.2d V37 2014-2018

Same OM651 engine in a larger sedan. Similar mechanical issues and where Direct Adaptive Steering is fitted it adds a unique and expensive failure mode.

Mercedes-Benz GLA 220 CDI X156 2014-2020

Mechanically identical OM651 and 7G-DCT powertrain on the same platform. Mercedes badge means far better parts supply and dealer support.

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.