2019 BMW 4-Series Reliability Score & Common Problems

Owners report two primary issues with the 2019 BMW 4-Series airbag system: passenger seat sensor malfunctions and airbag deployment failures. Complaints frequently mention error messages like "Passenger restraint system: Malfunction" and "Air Bag Off," indicating potential non-deployment in crashes. These issues often arise in vehicles with mileage ranging from 15,000 to over 86,000 miles. Safety implications are significant, with four complaints involving crashes and two injuries reported, including cases where airbags either deployed improperly or did not deploy at all. Used car buyers should be aware of these recurring issues and the potential high costs of repairs not covered under warranty.

Owners of the 2019 BMW 4-Series frequently report issues related to the engine, particularly involving the oil filter housing and coolant system. Complaints commonly describe oil filter housings made of plastic that crack and leak, often around 60,000 miles, potentially leading to engine overheating and posing a fire hazard. Additionally, multiple owners mention coolant leaks due to faulty hoses and fittings, which can result in engine overheating and reduced vehicle performance, typically occurring at around 35,000 to 42,000 miles. One report highlights a fire incident under the hood, resulting in vehicle destruction, although the specific cause was not determined. These issues could have significant safety implications, including the risk of stalling and fires, making them critical considerations for potential buyers.

Owners of the 2019 BMW 4-Series frequently report issues with the service brakes, particularly involving failure to engage properly. Complaints describe situations where the brake pedal is fully depressed, yet the vehicle does not stop as expected, sometimes accompanied by abnormal sounds or system warnings like "Electronic Stability Control System Malfunctioning." Additionally, the automatic braking system reportedly activates unexpectedly or fails to engage when needed, leading to several crashes, including one with an injury. These issues are noted at various mileages, with one report specifying approximately 31,000 miles. The safety implications are significant, as multiple incidents involve loss of control and collisions, often under normal driving conditions.

Owners of the 2019 BMW 4-Series, specifically the 430I model, report recurring issues related to coolant leaks and low coolant levels. Symptoms frequently include the "Coolant Low" warning message and instances of vehicle overheating. These problems often arise around 40,000 to 99,000 miles. One owner describes a diagnosis of a fractured coolant hose and issues with the oil filter housing and components connecting the engine block to the coolant reservoir, though repairs did not resolve the problem entirely. No safety incidents such as crashes or fires are reported in these complaints.

Owners of the 2019 BMW 4-Series report issues related to vehicle speed control, particularly sudden unintended acceleration and unexpected deceleration. Common symptoms include the car accelerating on its own without pressing the accelerator and the vehicle braking or losing speed suddenly without driver input. These incidents occur without warning lights or messages, except in one case where an unrelated seatbelt indicator light appeared. Complaints often describe these issues happening at highway speeds, posing significant safety risks due to the potential for loss of control. The throttle body actuator is identified as a faulty component in one instance, and issues have been noted both early in ownership and after some time, though specific mileage is not consistently reported.

Owners report issues with the steering in the 2019 BMW 4-Series, including the steering wheel locking unexpectedly and loss of power steering. These incidents occur while driving, with one owner describing the vehicle veering into oncoming traffic. Another common symptom is the appearance of multiple warning lights related to the steering and driving assistance systems, such as DSC light and increased steering effort warnings. Safety implications are significant, as these issues can lead to loss of vehicle control, posing a risk of accidents. The reports do not specify mileage, but they emphasize the need for immediate attention to these steering issues.

Owners of the 2019 BMW 4-Series report issues with the forward collision avoidance system, specifically instances where the vehicle's braking system activates unexpectedly without any apparent obstacles present. Complaints frequently mention the car coming to an abrupt stop on surface streets and highways in clear weather conditions, with no traffic ahead or behind. These incidents occur at various speeds, including as high as 50 mph, and while no mileage range is specified, the vehicle is noted to be under warranty in one report. Safety implications are significant, as abrupt stops could potentially lead to rear-end collisions if other vehicles are present. This information is crucial for prospective buyers to consider, especially those prioritizing safety features.