"Is the 7 Serisi 740ld reliable, and what should you check?"
When buying a used BMW 7 Series 740ld 2020 (G11/G12 facelift), the most frequently mentioned issue is cooling system problems (water pump/thermostat). AdBlue/SCR dosing system issues are also commonly reported.
Engine: B57
B57D30B · 740ld · Used in this car from 2015-2022
Known engine issues
Swirl flapsThe most known problem of this diesel is contamination of the intake manifold and its swirl flaps, resulting in power loss and unstable engine operation. In severe cases, the flap axle breaks and the manifold must be replaced.
Timing chain stretchGenerally, the timing chain of modular series engines lasts 200-250 thousand km or more, but for powerful diesels with huge torque, replacement by 100,000 km is not uncommon.
Oil leaksOn the specialized forum, there are many complaints about leaks from the pressure sensor and valve cover. If replacing the cover assembly does not help, the gasket under the camshaft bed leaks.
+2 more issues on the engine detail page
Known issues and risks
Listed from most frequently reported, each with its source.
Cooling system issues (water pump/thermostat)
Often reported
Cooling system failures are reported on G11 models: water pump, thermostat, or hose leaks may develop over time, potentially causing overheating or coolant loss.
Cooling
AdBlue/SCR dosing system issues
Often reported
The B57 engine family uses AdBlue-dosed SCR; some vehicles report injector anomalies, crystallisation in pipes, or NOx sensor failures, which can cause warnings, reduced performance, or emission messages on the dashboard.
Exhaust Emissions
Diesel Particulate Filter (DPF) clogging
Often reported
The DPF can clog if the vehicle is mostly used in city driving or on short trips that prevent full regeneration.
Exhaust Emissions
Injector and high-pressure system issues
Often reported
Modern common-rail diesel engines like the B57 have reported injector failures and, less frequently, high-pressure pump failures.
Fuel System
Turbocharger reliability (small turbo)
Often reported
Owner reports indicate issues with the small turbo in multi-stage configurations, including noises, power loss, blue smoke, and repeated wastegate actuator/ECU interventions or replacements.
Turbo
BMW 7 Serisi 740ld technical specs
BMW 7 Serisi 740ld (2020): boot 515 L; fuel use 5,4 l/100 km (urban 6,7 l/100 km · extra-urban 4,7 l/100 km); 0–100 in 5.1 s.
Boot capacity
515 L
Fuel consumption
5,4 l/100 km (urban 6,7 l/100 km · extra-urban 4,7 l/100 km)
What should I look for when buying a BMW 7 Series 740ld?+
When buying a 2020 740ld, check the service history, perform a test drive, and inspect engine/transmission warnings. Most commonly reported issues: cooling system problems (water pump/thermostat); AdBlue/SCR dosing system problems; Diesel Particulate Filter (DPF) clogging.
What are the common problems of the BMW 7 Series 740ld?+
Most frequently reported issues: cooling system problems (water pump/thermostat); AdBlue/SCR dosing system problems; Diesel Particulate Filter (DPF) clogging.
Is the BMW 7 Series 740ld reliable?+
Rather than a simple yes/no, it's best to weigh the proven pros and cons together. This page lists 5 verified findings.
How does Carbeak collect data?+
The cards on this page are derived from the Difetti fault database; compatibility of brand, fuel type, engine, and generation between source and target vehicle is verified. Topics with insufficient evidence are not shown.