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The BMW 428i, a part of the brand's first generation of the 4 Series, was a significant offering in the compact executive car class from its inception in July 2013 until its discontinuation in September 2020. Designed by Won Kyu Kang, the 428i was introduced as the successor to its predecessor and offered in coupe, convertible, and gran coupe versions. The vehicle was characterized by a longer and wider stance compared to its antecedents, with the coupe version being unveiled at the Frankfurt Motor Show in 2013. Powering the 428i was a 2.0 L N20 turbo I4 petrol engine capable of producing 180 kW (241 hp) and 350 Nm (258 ft-lb) of torque, which was also available in the convertible version, introduced at the 2013 Tokyo and LA Auto Shows. The convertible version of the 428i also featured a noise-absorbing three-part retractable hardtop and air curtains. The gran coupe version of the 428i was unveiled at the 2014 Geneva Motor Show and started production later that year. The 428i was replaced in 2016, marking the end of its production. Assembled in Munich and Regensburg, the coupe version was notable for its excellent acceleration, achieving 0 to 60 mph in just 5.4 seconds. Additionally, its EPA-rated fuel efficiency stood at 23 mpg in city driving and 35 mpg on the highway, making it a potent blend of power and fuel economy, coupled with engaging handling.
Three primary issues have been reported concerning the BMW 428i, including the 2015 xDrive and 2016 Gran Coupe models: the malfunctioning of the air compressor, the explosion of the sunroof, and the failure of the timing chain. Regarding the air conditioning (A/C) system, problems may manifest on hot days through weak airflow, overly warm air, or an unusual smell, indicating compromised seals, mildew or mold buildup, damaged hoses, or faulty ventilation fans. Specific issues can encompass a malfunctioning compressor clutch, system leaks, blown fuses, or a dirty cabin air filter. The problem of sunroof explosion, reported in 2015, is another significant issue, along with problems such as sticky door locks, engine seizures, failures of the backup camera and tailgate electric hatch, engine and fuel propulsion system failures, and airbag malfunctions. Lastly, design flaws in the N20 and N26 engines, including the 428i model from 2012 to 2015, contributed to premature timing chain failures at around 70,000 miles instead of the expected 105,000 miles. The failure could be either due to a stretched and loose primary timing chain, resulting in misfires, or in more severe instances, the chain snapping and causing catastrophic engine failure. These affected models necessitated labor-intensive and costly rebuilds, with expenses starting from £2,500 and involving genuine OEM parts and modified chains, guides, and tensioners. These three issues encapsulate the challenges related to the BMW 428i and underline the need for careful monitoring and appropriate response measures.
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