"Is the 4 Serisi 440i reliable, and what should you check?"
When buying a used BMW 4 Series 440i 2017 (F32 / F33 / F36 / F82 / F83), the most frequently mentioned issue is water pump/thermostat failures. Carbon buildup on valves is also commonly reported.
Engine: B58
B58B30A · 440i · Used in this car from 2016-2021
Known engine issues
Crankcase ventilationFirst-generation units had a short-lived crankcase ventilation valve, whose membrane wore out quickly, causing white smoke from the exhaust. Later the PCV design was revised and this problem became less common.
Oil pumpSecond-generation B58TU engines were equipped with a problematic version of the oil pump with a plastic adjustment ring that could crack even at low mileage. Then oil pressure dropped and a corresponding error appeared on the dashboard.
Coolant leaksThe most common cause of B58 engine failure is low coolant level, so it is extremely important to monitor leaks and replace the coolant reservoir cap every two years. If a coolant level error appears, you must go on a tow truck.
+1 more issues on the engine detail page
Known issues and risks
Listed from most frequently reported, each with its source.
Water pump/thermostat failures
Often reported
Many N55 engines are reported to have electric water pump and electronic thermostat failures as mileage increases, causing sudden overheating, temperature warning lights, or entering limp mode.
Cooling
Carbon buildup on valves
Often reported
The N55 direct injection engine is prone to carbon buildup on intake valves; this can cause poor response, rough idle, power loss, sluggish throttle response, and possible misfires.
Engine Internal
Oil consumption and leaks
Often reported
Higher than normal oil consumption and leaks from gaskets/connections (oil pan valve, oil pan plug, turbo hoses, valve cover gasket, oil filter housing) are commonly reported among Serie 4 (F32) 3.0 petrol engine owners.
Engine Internal
Injectors/HPFP and misfires
Often reported
High-pressure injector or HPFP failures cause misfires, idle fluctuation, and check engine light illumination.
Fuel System
Turbo wastegate rattle and boost leaks
Often reported
Some users report a buzzing or rattling noise from the turbo wastegate and boost leaks due to worn plastic charge pipes or hoses. Typical symptoms include a whistling noise during acceleration, slow boost buildup, or intermittent power loss.
Turbo
BMW 4 Serisi 440i technical specs
BMW 4 Serisi 440i (2017): boot 445 L; fuel use 7,7 l/100 km (urban 10,4 l/100 km · extra-urban 6,1 l/100 km); 0–100 in 5.2 s.
Boot capacity
445 L
Fuel consumption
7,7 l/100 km (urban 10,4 l/100 km · extra-urban 6,1 l/100 km)
What should I look for when buying a BMW 4 Series 440i?+
When buying a 2017 440i, check the service history, test drive, and look for engine/transmission warning lights. The most commonly reported issues are: water pump/thermostat failures; carbon buildup on valves; oil consumption and leaks.
What are the common problems of the BMW 4 Series 440i?+
The most frequently reported issues are: water pump/thermostat failures; carbon buildup on valves; oil consumption and leaks.
Is the BMW 4 Series 440i reliable?+
Rather than a simple yes or no, it is better 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; the source vehicle is verified for brand, fuel, engine, and generation match with the target vehicle. Topics with insufficient evidence are not shown.