2026 MINI Cooper problems
The 2026 MINI Cooper was sold with 2 engines that we have documented: the BMW B48 / B38 and the BMW B38 / B37. None has documented serious faults for the cars of that year. The safest option is the BMW B38 / B37 (verdict “Buy”).
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2026 MINI Cooper score: good reliability
Calculated using only 5 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
- Brakes10.0No documented faults
- Tyres and wheels10.0No documented faults
- Steering10.0No documented faults
- Electrical system10.0No documented faults
- 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 safety10.0No documented faults
What changes compared with the 2025 MINI Cooper
- Score: 7.6 → 9.1
- No longer affected by: seatbelts badly manufactured with reduced restraint (2025 cars) (rest of the car)
BMW B48 / B38 engine in the 2026 MINI Cooper
Names: Cooper C (1.5, 156 CV) · Cooper S (2.0, 204 CV)
- Buy
B38 1.5 136 hp (MINI Cooper, 118i)
136 hp · B38A15, B38B15
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.[2]
- Buy
B48 2.0 178-197 hp (120i, 220i, 320i, 520i, X1/X2/X3 20i, MINI Cooper S)
178–197 hp · B48A20, B48B20
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.[2]
Faults that affect 2026 cars
- 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.
- 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.
- 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.
BMW B38 / B37 engine in the 2026 MINI Cooper
Names: Cooper C (1.5, 156 CV)
- Buy
B38 1.5 136-140 hp from April 2015 (B38A15 / B38B15)
136 hp · B38A15, B38B15
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.[3]
Faults that affect 2026 cars
- 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.
- 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.
Buying a 2026 MINI Cooper?
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Frequently asked questions
Is the 2026 MINI Cooper reliable?
The 2026 MINI Cooper was sold with 2 engines that we have documented: the BMW B48 / B38 and the BMW B38 / B37. None has documented serious faults for the cars of that year. The safest option is the BMW B38 / B37 (verdict “Buy”).
Is the 2026 MINI Cooper better than the 2025?
Our score goes from 7.6 in 2025 to 9.1 in 2026. No longer affected by: seatbelts badly manufactured with reduced restraint (2025 cars) (rest of the car).
What is the best year for the MINI Cooper?
According to our score, the best is 2026 (9.1/10). The year with the worst score is 2024 (6.9/10). Each year's score counts only the engines sold that year and the faults that affect those cars.
What faults does the 2026 MINI Cooper have?
The most important ones documented for 2026 cars 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), coolant leaks and water pump or thermostat failure on the B38 (BMW B38 / B37, medium severity), carbon build-up on the intake valves (direct injection) (BMW B48 / B38, low severity) and carbon build-up on the B38's intake valves and injectors (BMW B38 / B37, low severity).
Own a 2026 MINI Cooper? Tell us what faults you have had and at how many kilometres. Report your fault.
Sources
Every fact on this page links to its source. If you find an error, let us know.
- Mini Cooper (J01)Wikipedia (inglés) · Other source · consulted 31 October 2026
- Motor BMW B48: defectos, mantenimiento y guía de compraRecambios y Accesorios BMW (blog) · Technical documentation · consulted 27 September 2026 · in Spanish
- BMW Dreizylinder: Dauertest-Probleme des B38 behoben?BimmerToday · Motoring press · published 5 October 2017 · consulted 4 October 2026 · in German