2026 BMW X7 problems
The 2026 BMW X7 was sold with 2 engines that we have documented: the BMW B58 and the BMW B57. The BMW B57 has serious faults that affect the cars of that year. The safest option is the BMW B57 (verdict “Buy”). Outside the engine, one documented fault affects 2026 cars, such as overheating of the starter motor and its relay, with a risk of fire.
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2026 BMW X7 score: acceptable reliability
Calculated using only 8 documented faults and their sources: the most serious and frequent faults weigh more. How it is calculated
- Engine7.1From 6.4 to 7.8 depending on the engine
- Gearbox10.0No documented faults
- Suspension6.90 faults
- Brakes8.40 faults
- Tyres and wheels10.0No documented faults
- Steering7.50 faults
- Electrical system7.11 fault
- Headlights and lights7.20 faults
- Electronics and infotainment10.0No documented faults
- Climate control10.0No documented faults
- Bodywork and interior7.40 faults
- Airbags and safety10.0No documented faults
What changes compared with the 2025 BMW X7
The same engines and the same documented faults as in 2025.
BMW B58 engine in the 2026 BMW X7
Names: xDrive40i
- With caution
B58TU 333-340 hp (B58B30M1, since 2018)
333–340 hp · B58B30M1, B58B30C
FCP Euro notes that the TU gives fewer PCV problems, but units built before 2021 may have the oil pump with a plastic housing, and the oil filter housing remains a part to watch.[3][4]
- Buy
B58TU2 381 hp (B58B30M2, since 2022)
381 hp · B58B30M2
The documented failures relate to the first series and to units built before 2021; we have found no faults specific to the TU2, although it has only been on the road for a few years and there is little real-world experience.[3][4]
Faults that affect 2026 cars
- Medium severityFrequency: CommonLubricationOil and coolant leak from the plastic oil filter housingThe B58's plastic oil filter housing can crack or lose its seal with heat and age, letting oil, coolant or both escape. One parts retailer puts the failure between 60,000 and 100,000 miles (roughly 97,000-161,000 km).Appears at around 97,000 km
- Medium severityFrequency: CommonLubricationOil leak from the valve cover gasketThe rubber gasket on the B58's valve cover hardens with heat cycles and eventually leaks oil: a burning smell, smoke near the cover and oil on the spark plugs. Guides place it between 60,000 and 100,000 miles (97,000-161,000 km).Appears at around 97,000 km
- Medium severityFrequency: OccasionalCoolingCoolant loss from the cap or the expansion tankCoolant loss is one of the most repeated problems in B58 guides. Workshops first suspect the expansion tank cap and also check the intercooler tank, the pipes and the pump before thinking about the head gasket.
- Medium severityFrequency: OccasionalCoolingWater pump and thermostat module (thermal management) leakOn the B58 the water pump and the thermostat module (thermal management) can leak coolant, with a low-level warning and traces of fluid at the back of the engine. Guides place pump failures between 75,000 and 120,000 miles and module failures from around 40,000.Appears at around 120,000 km
BMW B57 engine in the 2026 BMW X7
Names: xDrive30d · xDrive40d · M50d
- Buy
B57D30 286-340 hp, twin turbo with 48 V (B57D30O2/T2, 2020 onwards)
286–340 hp · B57D30O2, B57D30T2
It is the most recent version and we have no specific faults documented; being the youngest, it also has the least history. A specialist garage treats it, with the second generation of the 48 V system, as the engine's most mature phase.[6]
Faults that affect 2026 cars
- Medium severityFrequency: OccasionalEmissions controlAdBlue/SCR system fault (NOx sensors, heater and pump)A specialist garage considers the B57's AdBlue/SCR system the fault that most often leaves cars immobilised: a NOx sensor, the quality sensor, the heater or the pump usually fails, and topping up the tank rarely stops the countdown of remaining starts.
- High severityFrequency: RareTimingTiming chain wear on the gearbox sideDasercars states that the B57 does not repeat the N47's premature chain wear, but that the chain is still on the gearbox side, so any work on it is expensive. A brief rattle when cold should be checked soon.
- High severityFrequency: RareTurboDegradation of the turbos on multi-turbo versionsOn the twin-turbo and four-turbo versions, a specialist garage considers oil in the intercooler or intake ducts the earliest warning of turbo degradation, before any fault codes appear.
Faults outside the engine in the 2026 BMW X7
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Frequently asked questions
Is the 2026 BMW X7 reliable?
The 2026 BMW X7 was sold with 2 engines that we have documented: the BMW B58 and the BMW B57. The BMW B57 has serious faults that affect the cars of that year. The safest option is the BMW B57 (verdict “Buy”). Outside the engine, one documented fault affects 2026 cars, such as overheating of the starter motor and its relay, with a risk of fire.
Is the 2026 BMW X7 better than the 2025?
Going by the documented faults, they are the same: the same engines and the same faults affect the 2025 and 2026 cars. Choose on condition, mileage and maintenance history.
What is the best year for the BMW X7?
According to our score, the best are 2026 and 2025 (7.1/10). The year with the worst score is 2018 (6.3/10). Each year's score counts only the engines sold that year and the faults that affect those cars.
What faults does the 2026 BMW X7 have?
The most important ones documented for 2026 cars are: overheating of the starter motor and its relay, with a risk of fire (electrical system, critical severity), timing chain wear on the gearbox side (BMW B57, high severity), degradation of the turbos on multi-turbo versions (BMW B57, high severity), oil and coolant leak from the plastic oil filter housing (BMW B58, medium severity) and oil leak from the valve cover gasket (BMW B58, medium severity).
Own a 2026 BMW X7? 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.
- BMW B58Wikipedia (inglés) · Other source · consulted 9 October 2026
- BMW B58Wikipedia (alemán) · Other source · consulted 9 October 2026 · in German
- BMW B58 EngineFCP Euro · Technical documentation · consulted 9 October 2026
- The Popular BMW B58 Inline-Six Engine Has One Big Achilles HeelThe Autopian · Motoring press · published 14 June 2024 · consulted 9 October 2026
- BMW X7Wikipedia · Other source · consulted 4 October 2026
- Motor BMW B57: fiabilidad y averíasDasercars · Motoring press · consulted 4 October 2026 · in Spanish