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The 2018 4 Series is less reliable than other cars from the same model year.
The Reliability score is based on our latest subscriber survey of 2018 BMW 4 Series owners. The owner comments describe problems respondents experienced with this vehicle.
Muffler, pipes, catalytic converter, exhaust manifold, heat shields, leaks.
"Light malfunction"
Anonymous, VA (2018 BMW 4 Series 430i 2.0-L 4 Cyl turbo)"Engine mount replacement"
Anonymous, AZ (2018 BMW 4 Series 430i 2.0-L 4 Cyl turbo)Radiator, cooling fan, water pump, thermostat, antifreeze leaks, overheating.
"BMW uses plastic coolant lines as well as the oil filter housing/ heat exchanger is made of plastic. Poor design for a component that goes through numerous thermal cycles."
Anonymous, FL (2018 BMW 4 Series 430i 2.0-L 4 Cyl turbo)Accessory belts and pulleys, engine computer, engine mounts, engine knock or ping, fuel leaks, oil leaks.
"Engine counterbalance shaft plugs are made of plastic and have a n O ring installed. Poor design. Plastic gets brittle then engine leaks at the front of the motor."
Anonymous, FL (2018 BMW 4 Series 430i 2.0-L 4 Cyl turbo)Alternator, starter, hybrid battery replacement, hybrid battery related systems, regular battery, battery cables, engine harness, coil, ignition switch, electronic ignition, spark plugs and wires failure, auto stop/start.
Sensors (O₂, or oxygen, sensor), emission-control devices (includes EGR), fuel-injection system, fuel gauge/sender, fuel pump, problems filling up the tank.
Squeaks, rattles, wind noises, seals and/or weather stripping, air and water leaks.
Cruise control, clock, warning lights, body control module, keyless entry, wiper motor or washer, tire pressure monitor, interior or exterior lights, horn, gauges, 12V power plug, USB ports, alarm or security system, remote engine start, heated or cooled seats, heated steering wheel, headlights, automatic headlights, automatic wipers, wireless charging pad.
Engine rebuild or replacement, cylinder head, head gasket, turbocharger or supercharger, timing chain or belt.
Infotainment system (audio, GPS, phone), rear entertainment system, backup or other camera/sensors, head-up display.
AC compressor, blower (fan) motor, condenser, evaporator, heater system, automatic climate system, electrical failure, refrigerant leakage.
Windows, locks and latches, doors or sliding doors, tailgate, trunk or hatch, mirrors, seat controls (power or manual), seat belts, sunroof, convertible top, glass defect.
Premature pad/rotor wear, pulsation or vibration, antilock system, parking brake, master cylinder, calipers, squeaking, brake failure, regenerative braking.
Transmission rebuild or replacement, torque converter, premature clutch replacement.
Gear selector and linkage, transmission computer, transmission sensor or solenoid, clutch adjustment, rough shifting, slipping transmission, leaks.
Paint (fading, chalking, peeling, or cracking), loose interior or exterior trim or moldings, rust.
Shocks or struts, ball joints, tie rods, wheel bearings, alignment, steering linkage (includes rack and pinion), power steering (pumps and hoses, leaks), wheel balance, springs or torsion bars, bushings, electronic or air suspension.
Driveshaft or axle, CV joint, differential, transfer case, four-wheel-drive/all-wheel-drive components, driveline vibration, electrical failure, traction control, electronic stability control.
"engine crank case air ventilation $3000 repair"
Anonymous, CA (2018 BMW 4 Series M4 3.0-L 6 Cyl turbo)