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MINI Cooper J01 problems (2024–today)

We have documented 2 engines for the MINI Cooper J01 and none has high or critical severity faults in the versions it is fitted to. The safest option is the BMW B38 / B37, with a «Buy» verdict.[1]

Outside the engine: Beyond the engine, the fourth-generation MINI Cooper (J01 electric and F66 petrol) has three official EU recalls: high-voltage battery cell modules in the electric Cooper that carry a risk of short circuit and fire (extended in 2025), a brake booster with a badly welded hollow shaft (2025), and seatbelts badly manufactured on 2025 cars. These are precautionary batch recalls, not widespread faults.[2][3][4]

MINI Cooper J01 (2024–today)
Photo: Harvey Bold · CC BY 4.0 · Wikimedia Commons. Reference image for this generation.
02468106.6out of 10

MINI Cooper J01 rating: acceptable reliability

Calculated using only 8 documented faults and their sources: the most serious and frequent faults weigh more. How it is calculated

  • Engine8.2From 7.6 to 8.9 depending on the engine
  • Gearbox10.0No documented faults
  • Suspension10.0No documented faults
  • Brakes7.11 fault
  • Tyres and wheels10.0No documented faults
  • Steering10.0No documented faults
  • Electrical system7.11 fault
  • Headlights and lights10.0No documented faults
  • Electronics and infotainment10.0No documented faults
  • Climate control10.0No documented faults
  • Bodywork and interior10.0No documented faults
  • Airbags and safety7.11 fault

Ranked 15 of 29 among the city cars with solid evidence. See the ranking

The weak points of the MINI Cooper J01

  1. 1Critical severity: High-voltage battery cell modules out of specification (electric Cooper, risk of short circuit and fire)Electrical system
  2. 2Critical severity: Brake booster with a hollow shaft badly welded (2025 campaign)Brakes
  3. 3Critical severity: Seatbelts badly manufactured with reduced restraint (2025 cars)Airbags and safety
  4. 4Medium severity: Deterioration of hoses and seals in the cooling circuit, with coolant lossBMW B48 / B38 engine
  5. 5Medium severity: Oil leaks or seepage from seals and covers, near the turbo and the VANOSBMW B48 / B38 engine

Documented engines, from highest to lowest risk

The first label is the most serious fault affecting that engine in this car; the second, our verdict for the versions it is fitted to. Each engine's risk index is calculated only from the faults that affect this car (how we calculate it). We only show engines we have documented with sources: if yours does not appear, we have not analysed it yet. View all engines

See what to check before buying

Outside the engine

3 recalls and campaigns documented, the latest: Seatbelts not manufactured correctly. See the campaigns for the MINI Cooper J01

10 sourcesHow we work

BMW B48 / B38

BMW B48 (B48A20 / B48B20) / B38 (B38A15 / B38B15) · Petrol

In the Cooper J01
since 2024[5]
Names
Cooper C (1.5, 156 CV) · Cooper S (2.0, 204 CV)
Faults that affect it
3
Risk index on this car
24
Low risk

Verdict for the versions it uses

  • B38 1.5 136 hp (MINI Cooper, 118i)since 2014 · 136 hp · B38A15, B38B15

    Buy

    We have found no serious, widespread fault documented specifically for the B38; it shares with the rest of the family the same watch points around the cooling circuit and the oil seals.[6]

  • It is the most widely fitted B48 version and has no serious, widespread fault on record; it is worth checking the cooling circuit and any oil leaks next to the turbo and the VANOS.[6]

Faults that affect the Cooper J01

Only those that affect the versions and years that this car used. The BMW B48 / B38 has 4 documented faults in total.

  1. Medium severityFrequency: OccasionalCoolingDeterioration of hoses and seals in the cooling circuit, with coolant lossYes: over the years and many heat cycles, the hoses, the expansion tank and some of the plastic seals in the B48/B38 cooling circuit can deteriorate and lose coolant, sometimes without any visible puddle under the car.
  2. Medium severityFrequency: OccasionalLubricationOil leaks or seepage from seals and covers, near the turbo and the VANOSYes: over time, oil seepage or leaks can appear at seals, covers and crankcase ventilation connections, in an area of the engine close to the turbo and the VANOS system.
  3. Low severityFrequency: CommonIntakeCarbon build-up on the intake valves (direct injection)Yes, as on most direct-injection engines: because they are not washed by fuel, the intake valves on the B48/B38 build up carbon over the years, especially in urban use, with a loss of smoothness and a less stable idle.

Cooper J01 BMW B48 / B38 pageAll versions and faults of the BMW B48 / B38

BMW B38 / B37

Safest option

BMW B38 (1.5 gasolina) and B37 (1.5 diésel) de tres cilindros · Petrol

In the Cooper J01
since 2024[5]
Name
Cooper C (1.5, 156 CV)
Faults that affect it
2
Risk index on this car
11
Low risk

Verdict for the version it uses

Faults that affect the Cooper J01

Only those that affect the versions and years that this car used. The BMW B38 / B37 has 3 documented faults in total.

  1. Medium severityFrequency: RareCoolingCoolant leaks and water pump or thermostat failure on the B38Two sources point to the cooling circuit (thermostat housing, electric water pump and hoses) as the most cited wear point on the B38, with leaks from around 70,000 km. The data is scarce and of uneven quality, so it is treated as a risk to watch rather than a widespread fault.
  2. Low severityFrequency: OccasionalIntakeCarbon build-up on the B38's intake valves and injectorsAs a direct-injection engine, the B38 builds up carbon deposits on the intake valves and injectors, like other direct-injection petrol engines. The German press cites it as the point to watch in an otherwise trouble-free engine, and it is noticed mainly on short journeys.

Cooper J01 BMW B38 / B37 pageAll versions and faults of the BMW B38 / B37

Faults of the MINI Cooper J01 outside the engine

Suspension, brakes, tyres, electronics and the rest of the car. They occur with any engine.

Checklist for buying a used MINI Cooper J01

Check the advert or the paperwork to see which engine the car has and go through its section. Each point comes from a documented fault; you can tick them off as you inspect.

If it has the BMW B48 / B38 (since 2024)

Deterioration of hoses and seals in the cooling circuit, with coolant loss

Medium severity

Oil leaks or seepage from seals and covers, near the turbo and the VANOS

Medium severity

Carbon build-up on the intake valves (direct injection)

Low severity

If it has the BMW B38 / B37 (since 2024)

Coolant leaks and water pump or thermostat failure on the B38

Medium severity

Carbon build-up on the B38's intake valves and injectors

Low severity

Wear parts for the MINI Cooper J01

Brakes, wiper blades, pollen filter and battery, searched for this model. The exact part number depends on the engine and year: confirm it with the registration plate or VIN.

Affiliate links: if you buy from these shops, MotorFiable may receive a commission at no cost to you. Check compatibility against the registration plate or VIN before ordering. Affiliate links

Buying a MINI Cooper J01?

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Own a MINI Cooper J01? Tell us what faults you have had, at what mileage and how much you paid. Report your fault.

Frequently asked questions

Is the MINI Cooper J01 reliable?

We have documented 2 engines for the MINI Cooper J01 and none has high or critical severity faults in the versions it is fitted to. The safest option is the BMW B38 / B37, with a «Buy» verdict. Beyond the engine, the fourth-generation MINI Cooper (J01 electric and F66 petrol) has three official EU recalls: high-voltage battery cell modules in the electric Cooper that carry a risk of short circuit and fire (extended in 2025), a brake booster with a badly welded hollow shaft (2025), and seatbelts badly manufactured on 2025 cars. These are precautionary batch recalls, not widespread faults.

Which MINI Cooper J01 engine is the most reliable?

Among the 2 engines we have documented, the safest option is the BMW B38 / B37, with a «Buy» verdict. BMW says the bearing change eliminated the problem, and we have found no other serious, widespread fault documented in the press or by official bodies for these units.[1]

What problems does the MINI Cooper J01 have apart from the engine?

Beyond the engine, the fourth-generation MINI Cooper (J01 electric and F66 petrol) has three official EU recalls: high-voltage battery cell modules in the electric Cooper that carry a risk of short circuit and fire (extended in 2025), a brake booster with a badly welded hollow shaft (2025), and seatbelts badly manufactured on 2025 cars. These are precautionary batch recalls, not widespread faults. The most important documented faults are: high-voltage battery cell modules out of specification (electric Cooper, risk of short circuit and fire) (electrical system, critical severity), brake booster with a hollow shaft badly welded (2025 campaign) (brakes, critical severity) and seatbelts badly manufactured with reduced restraint (2025 cars) (airbags and safety, critical severity).[2][3][4]

What faults does the MINI Cooper J01 have?

The most important by severity and frequency, on the engines we have documented, are: deterioration of hoses and seals in the cooling circuit, with coolant loss (BMW B48 / B38, medium severity), oil leaks or seepage from seals and covers, near the turbo and the VANOS (BMW B48 / B38, medium severity), carbon build-up on the intake valves (direct injection) (BMW B48 / B38, low severity), coolant leaks and water pump or thermostat failure on the B38 (BMW B38 / B37, medium severity) and carbon build-up on the B38's intake valves and injectors (BMW B38 / B37, low severity).

What is the best year to buy a MINI Cooper J01?

According to our rating by year, the best is 2026 (9.1/10); the worst rated is 2024 (6.9/10). Each year's rating counts only the engines sold that year and the faults that affect those units: open each year to see what changes.

Does the MINI Cooper J01 have recalls?

Yes: we have documented 3 campaigns for the MINI Cooper J01, such as seatbelts not manufactured correctly (2025). Check with your VIN at the official service centre whether yours has been done.[4]

Sources

Every fact on this page links to its source. If you find an error, let us know.

  1. BMW Dreizylinder: Dauertest-Probleme des B38 behoben?BimmerToday · Motoring press · published 5 October 2017 · consulted 4 October 2026 · in German
  2. Safety Gate: alerta A12/03519/24 (MINI Cooper y Aceman, módulos de celdas de la batería de alta tensión)Comisión Europea – Safety Gate · Official body · published 30 January 2025 · consulted 31 October 2026
  3. Safety Gate: alerta SR/00051/25 (MINI Cooper, Countryman y Aceman, eje hueco del servomotor del freno)Comisión Europea – Safety Gate · Official body · published 7 January 2025 · consulted 31 October 2026
  4. Safety Gate: alerta SR/03495/25 (MINI Cooper y Countryman, cinturones de seguridad)Comisión Europea – Safety Gate · Official body · published 9 October 2025 · consulted 31 October 2026
  5. Mini Cooper (J01)Wikipedia (inglés) · Other source · consulted 31 October 2026
  6. Motor BMW B48: defectos, mantenimiento y guía de compraRecambios y Accesorios BMW (blog) · Technical documentation · consulted 27 September 2026 · in Spanish
  7. BMW B38: fiabilidad y puntos débiles (Autoscore)Autoscore · Other source · consulted 30 October 2026
  8. BMW B38 engine reliability, efficiency and tuningBMWBLOG · Motoring press · published 18 December 2025 · consulted 30 October 2026
  9. BMW B38: Probleme, Schwachstellen und ZuverlässigkeitGebrauchtwagenberater.de · Motoring press · published 2 November 2025 · consulted 30 October 2026 · in German
  10. MINI Countryman F60: Probleme und SchwachstellenGebrauchtwagenberater.de · Motoring press · consulted 30 October 2026 · in German