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With its sleek lines, powerful engines, and a driver-focused cockpit, the BMW 4 Series vehicles provide their owners with the ultimate driving experience. To maintain these features and extend the vehicle's longevity, the BMW 4 Series requires accurate repair and precise, meticulous maintenance.
To fulfill these requirements of the BMW 4 Series in Phoenix, we at Tanner Motors provide you with expert and precise auto services, specializing in European auto models.
First introduced in 2014, the 4 Series features BMW's sportier coupe and convertible models. Currently, at its second generation, the BMW 4 Series now features the G22 Coupe, G23 Convertible, and G26 Gran Coupe. The previous generation, which is the first generation of the 4 Series, featured the F32 Coupe, F33 Convertible, and F36 Gran Coupe.
Modern BMW 4 Series vehicles, including the M440i, feature a 48-volt mild-hybrid system that aids the engine, smooths out the auto start/stop function, and improves the vehicle's efficiency. Software glitches or premature battery failure can cause a mild-hybrid system malfunction, resulting in symptoms such as a "Drivetrain Malfunction" warning on the dashboard, jerky auto start/stop, or a no-start condition.
Our technicians at Tanner Motors in Phoenix connect the vehicle's computer to read and analyze the specific fault codes, pinpointing the exact origin of the malfunction. The repair involves software updates or battery replacements for the BMW 4 Series vehicle.
The plastic guides that keep the engine's timing chain under proper tension become brittle over time and can break apart due to continuous heat cycles. As a result, the chain skips a tooth or has loose tension entirely, causing the pistons to collide with the valves. In extreme cases, this leads to catastrophic engine failure, and as a result, the vehicle shows symptoms such as a distinct, high-pitched whining or rattling sound coming from the front of the engine.
The repair involves replacing the timing chain guide, and in the event of chain damage, replacing the entire tensioner assembly. Technicians at our shop in Phoenix disassemble the engine bay and replace the tensioner assembly in the BMW 4 Series vehicle.
The rubber gasket sealing the oil filter housing continuously faces heat cycles that degrade its elastic characteristics. The gasket then hardens, making it prone to leaks. An oil deposit under the vehicle is a prominent sign of an oil leak. Additionally, the leaked oil from the gasket often drips directly onto the central serpentine belt, which can cause the belt to slip, degrade, and eventually shred, resulting in a loss of power steering, alternator function, and even engine seizure.
Technicians at our Phoenix shop disassemble the engine and replace the gasket. If the serpentine belt has malfunctioned, the belt must be replaced.

Our ASE-certified technicians have received the latest factory training on European auto repairs and provide comprehensive auto service, covering all vehicle systems and modules of your BMW 4 Series. Utilizing advanced factory-grade diagnostic scanners and repair tools, we ensure precise repairs and high-quality services. We also use genuine, high-quality parts and fluids in our repairs. We commit to and provide transparent service and cost, without any pressure, repair, or inflated charges.
Operating at 10221 North Cave Creek Road in Phoenix, we also serve European auto owners in nearby cities, including Cave Creek, Desert Ridge, Glendale, Moon Valley, Paradise Valley, Peoria, and Scottsdale.
Power loss in the BMW 4 Series can be attributed to several factors, including a clogged air filter, faulty spark plugs, a failing fuel pump, or issues with the turbocharger. A diagnostic scan is needed to identify the actual cause.
In the BMW 4 Series, symptoms of a failing turbocharger include noticeable decrease in power, unusual whining or hissing noises from the engine, excessive oil consumption, and blue smoke from the exhaust.
Modern BMW 4 Series models use a timing chain that lasts the engine's life. However, a rattling noise from the motor is the primary indication of a chain malfunction, and hearing this is the sign that the chain needs replacement.
For proper lubrication and wear prevention on the differential components, fresh differential fluid is typically introduced in the BMW 4 Series around every 50,000 to 75,000 miles, especially on xDrive models.