2021 Bmw X4 problems, complaints & recalls
Most-reported problem areas: Seat Belts (2) · Suspension (1) · Power Train (1)
🧭 Reliability snapshot
Compared against other Bmw X4 model years — complaint volume vs the model's median year, recalls and severity. How we score →
Safety recalls (7)
Electrical System:starter Assembly 2026-01-30 · campaign 26V056000 · 87,394 vehicles
Defect: BMW of North America, LLC (BMW) is recalling certain 2021-2023 Toyota Supra, 2022-2023 2 Series Coupe, 2021-2024 5 Series (xDrive), 2021-2022 Z4, 2022-2024 4 Series (Gran Coupe), 2021-2024 4 Series (Convertible and xDrive Convertible), 2021-2023 4 Series (Coupe), 2021-2024 3 Series, 2021-2023 X4, 2021-2024 X3 vehicles. Please see the recall report for a complete list of all models. The engine starter may overheat and catch fire due to wear on an internal component.
Risk: Fire increases the risk of injury.
Fix: Dealers will replace the engine starter, free of charge. Owner notification letters were mailed July 21, 2026. Owners may contact BMW customer service at 1-800-525-7417 or Toyota's customer service at 1-800-331-4331. Vehicle Identification Numbers (VINs) involved in this recall will be searchable on NHTSA.gov beginning March 24, 2026.
Electrical System:starter Assembly:relay 2025-09-23 · campaign 25V636000 · 199,674 vehicles ⚠ PARK OUTSIDE
Defect: BMW of North America, LLC (BMW) is recalling certain 2019-2021 BMW 330i, 2019-2022 BMW Z4, 2020-2022 BMW 530i, X3, X4, Toyota Supra, 2021-2022 BMW 430i, 430i Convertible, and 2022 BMW 230i vehicles. The engine starter relay may corrode, causing the relay to overheat and short circuit.
Risk: A short circuit in the starter relay may increase the risk of a fire.
Fix: Owners are advised to park their vehicles outside and away from structures until the remedy is complete. Dealers will replace the engine starter, free of charge. Owner notification letters were mailed February 6, 2026. Owners may contact BMW customer service at 1-800-525-7417. Vehicle Identification Numbers (VINs) involved in this recall became searchable on NHTSA.gov November 14, 2025.
Seats 2023-03-29 · campaign 23V211000 · 51 vehicles
Defect: BMW of North America, LLC (BMW) is recalling certain 2019-2021 330i, 330i xDrive, M340i xDrive, 2020-2021 X3 sDrive30i, X3 xDrive30i, X3 M40i, X3M, 2021 X3 xDrive30e, X4 xDrive30i, and X4M vehicles. The seat frame may not have been welded properly to the seat rails.
Risk: An improperly welded seat frame may not properly restrain the occupant during a crash, increasing the risk of injury.
Fix: Dealers will replace the seat frame and back rest, free of charge. Owner notification letters were mailed May 22, 2023. Owners may contact BMW customer service at 1-800-525-7417.
Engine 2021-08-02 · campaign 21V598000 · 50,024 vehicles
Defect: BMW of North America, LLC (BMW) is recalling certain 2020 M340i, M340i xDrive, 540i, 540i xDrive, X3 M40i, 2020-2021 X4 M40i, 745Le xDrive, 2019-2021 Z4 M40i, and 2020-2021 Toyota Supra vehicles. During engine start, the engine management software may cause loss of braking assist. Full mechanical braking (without assist) remains available.
Risk: Loss of braking assist can increase the risk of a crash.
Fix: Dealers will update the engine management software, free of charge. Owner notification letters were mailed on September 17, 2021. Owners may contact BMW customer service at 1-800-525-7417.
Fuel System, Gasoline:storage:tank Assembly 2021-03-24 · campaign 21V199000 · 17 vehicles
Defect: BMW of North America, LLC (BMW) is recalling certain 2021 X3 sDrive30i, X3 xDrive30i, X3 M40i, X3M, and X4, and 2021 X4 xDrive30i vehicles. The inlet check valve weld may fail, allowing the filling pipe to separate from the fuel tank.
Risk: Fuel may leak through the failed weld, increasing the risk of a fire.
Fix: BMW will notify owners, and dealers will replace the fuel tank, free of charge. The recall is scheduled to begin May 17, 2021. Owners were also contacted by telephone. To date, all repairs have been done. No further owner notification letters will be sent. Owners may contact BMW customer service at 1-800-525-7417.
Back Over Prevention:software 2021-02-19 · campaign 21V096000 · 13,858 vehicles
Defect: BMW of North America, LLC (BMW) is recalling certain 2019-2021 X3 sDrive30i, X3 xDrive30i, X3 M40i, X3M, X4 xDrive30i, X4 M40i, M550i, X4M, X5 sDrive40i, X5 xDrive40i, X5 xDrive50i, X5M, X5 M50i, X7 xDrive40i, X7 xDrive50i, X7 M50i, Alpina XB7, 330i, 330i xDrive, M340i, M340i xDrive, and 8 Series Coupe, Convertible and Grand Coupe, 840i, 840i xDrive, M850i xDrive, M8, 2020-2021 530e, 530e xDrive, 330e, 330e xDrive, 745Le, 745Le xDrive, X5 xDrive45e, X3 xDrive30e, X6 sDrive40i, X6 xDrive40i, X6 x
Risk: If the driver relies on only the rearview camera image, the missing or reduced rearview image view can increase the risk of a crash or injury.
Fix: BMW will notify owners, and dealers will inspect the rearview camera software and update it if necessary, free of charge. The recall began April 16, 2021. Owners may contact BMW customer service at 1-800-525-7417.
Back Over Prevention: Sensing System: Camera 2020-09-30 · campaign 20V598000 · 312 vehicles
Defect: BMW of North America, LLC (BMW) is recalling certain 2020-2021 X3 sDrive 30i, X3 xDrive 30i, X3M 40i, X3 xDrive 30e, X4 xDrive 30i, X4M 40i, 530i, 540i, 540i xDrive, M550i xDrive, M5, 550e, 550e xDrive, and 550e iPerformance vehicles. A small portion of the rearview image may be slightly obscured. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 111, "Rear Visibility."
Risk: If the driver relies on only the rearview camera image, the reduced rearview image view can increase the risk of a crash or injury.
Fix: BMW will notify owners, and dealers will inspect and, if necessary, program the rearview camera with updated software. The recall began November 18, 2020. Owners may contact BMW customer service at 1-800-525-7417.
Service bulletins (168)
Technical service bulletins are repair instructions manufacturers send dealers for known issues. Unlike recalls, the fix is not automatically free — but naming the bulletin at the service desk can save diagnosis time and support goodwill repairs.
Engine 2026-07-17 · B110426 · Service Bulletin/Repair Instructions
the manual starting of electronic engine oil level measurement from inside the vehicle, usually afterperforming an engine oil service task, is inoperative or it may lock up at between a 15% to 30% completionrate.
Engine 2026-06-29 · B010324 · Warranty Program/Extension
the evap systems purge (vent) valve limited warranty for defects in materials and / or workmanship has been extended to 15 years / 150,000 miles as determined from the original first in-service / delivery date.
Engine 2026-05-06 · B010324 · Warranty Program/Extension
the evap systems purge (vent) valve limited warranty for defects in materials or workmanship has been extended to 15 years / 150,000 miles as determined from the original in-service date.
Service Brakes 2025-04-30 · B661719 · Service Bulletin/Repair Instructions
the vehicle applies the brakes on its own when reversing onto an inclined roadway or driveway. this appliesonly to the situation where the active pdc option is activated via the idrive.
Air Bags 2025-01-06 · B650122 · Warranty Program/Extension
the limited warranty for the knee air bag wire harness repair cable procedure for defects in materials and / or workmanship has been extended to 10 years / 120,000 miles as determined from the original first in-service / delivery date.
Structure 2024-04-04 · B410722 · Service Bulletin/Repair Instructions
while driving the vehicle on normal roads at10mph and above, a "cracking" sound from the top of the b-pillar(s) is heard.
Showing the 6 most recent of 168 bulletins. Search all of them free at nhtsa.gov.
What owners report
2026-04-07 · Power Train“i am reporting a safety concern regarding bmw vehicles equipped with the b58 technical update (b58tu) engine, commonly found on models from 2019 to 2021. the oil pump in these vehicles is failing prematurely. i was told this by service technicians at bmw and confirmed it through my own research. the oil pump failure is due to a plastic adjusting r…”
2026-02-11 · Engine · 70,000 mi“the contact owns a 2021 bmw x4. the contact received notification of nhtsa campaign number: 25v636000 (electrical system). while the vehicle was in park(p), there were abnormal sounds coming from the engine. the contact stated that when the vehicle was shifted into drive(d) and the brake pedal was depressed, there was an abnormal sound coming from …”
2026-02-03 · Seat Belts“went to sit in driver rear seat and put on my seat belt and found it frayed apart. thought this was od and tried the rear passenger side only to find the exact same thing. took it to the dealer in visalia, ca. they said that they have never seen anything like that before. after discovering that both belts were broken in the same spot, they conclude…”
2026-01-26 · Seat Belts“both rear seat belts have broken off in the same spot. went to use the driver's side rear seat belt and found it had been broken (frayed off). moved to the passenger side and found the exact same thing. this could have been a bad situation if in an accident had occurred where they had not completely frayed but would have failed. took it to my loca…”
2026-01-09 · Unknown Or Other“transfer case awd/xdrive system drivetrain components the dealer diagnosed a transfer case failure on the bmw x4 xdrive. vehicle displayed drivetrain malfunction warning. repair estimate exceeds $20,000. the vehicle has under 50,000 miles. the issue appears consistent with known xdrive transfer case complaints. the warning light came on on januar…”
2023-02-16 · Suspension“what component or system failed or malfunctioned, and is it available for inspection upon request? - suspension how was your safety or the safety of others put at risk? - its giving head ache and body pain, driver & passengers are jumping / shaking / feeling very uncomfortable has the problem been reproduced or confirmed by a dealer or independen…”
Excerpts of consumer complaints filed with NHTSA, lightly truncated. They are owner statements, not verified findings.