DBS may fail to activate, leading to insufficient braking assistance during emergency situations.

Variability in engine performance may be noted between the 473hp and 503hp configurations, causing inconsistent driving experiences.

Problems with the ignition system or fuel injectors can cause one or more of the six cylinders to misfire, leading to rough engine performance.

Turbochargers can wear out or fail, particularly in high-performance engines, causing a significant drop in power and efficiency.

Oil leaks are common in high-performance engines, often due to gasket or seal failures, leading to potential engine damage if not addressed.

High-performance engines like the ones in the BMW X4 may experience overheating due to a malfunctioning cooling system, such as a failing water pump or radiator.

The high torque and power output can place extra stress on the transmission, leading to issues such as slipping gears or delayed shifting.

High-performance engines require precise fuel delivery, and any issues in the fuel system, like clogged injectors or a failing fuel pump, can lead to performance problems.

Modern vehicles have numerous electronic components that can fail, including sensors and control modules, which may affect engine performance and reliability.

Performance-focused exhaust systems can develop leaks or become damaged, leading to increased emissions and noise along with decreased performance.

BMW X4 engines can experience oil leaks, often from the valve cover gasket or oil pan gasket.

The timing chain can wear prematurely, causing rattling noises or engine misfires.

The cooling system, including the water pump and thermostat, can fail, leading to overheating.

Fuel injectors can become clogged or fail, causing poor engine performance or misfires.

Direct injection engines can suffer from carbon buildup on intake valves, reducing performance and efficiency.

The turbocharger can fail or wear out, leading to reduced power and efficiency.

Issues with the engine's electrical components, such as sensors or the ECU, can cause various performance problems.

The high-pressure fuel pump can fail, leading to poor engine performance or stalling.

BMW engines, including the 6-cylinder ones, are often prone to oil leaks, particularly from the valve cover gasket and oil filter housing gasket.

The cooling system in BMWs can be problematic, with issues such as water pump failures and radiator leaks being common.

The high-pressure fuel pump (HPFP) in BMWs can fail, leading to rough engine performance and difficulty starting the vehicle.

Direct injection engines in BMWs can suffer from carbon build-up on the intake valves, leading to reduced performance and efficiency.

Turbocharged engines, like those in the X4 M and X4 M Competition, can experience turbocharger failures or issues, especially if not properly maintained.

The Variable Valve Timing system (Vanos) in BMW engines can fail, causing rough idling and poor engine performance.

BMWs often face various electrical issues, such as malfunctioning sensors and electronic control units (ECUs), which can affect engine performance.