AI Damage2021 BMW X4: common problems
Owners of the 2021 BMW X4 filed 6 complaints with NHTSA, most often about engine and seat belts. The maker issued 168 service bulletins for this year. Details by component below, with sources.
Key figures
- Owner complaints
- 6
- Technical service bulletins (TSB)
- 168
What fails most often
- 1 Engine 33% of all complaints
- 2 Seat belts 33% of all complaints
- 3 Suspension 17% of all complaints
- 4 Powertrain 17% of all complaints
- Engine: 2 complaints (33% of all); manufacturer bulletins for this component: 9.
- Seat belts: 2 complaints (33% of all); manufacturer bulletins for this component: 1.
- Suspension: 1 complaints (17% of all); manufacturer bulletins for this component: 4.
- Powertrain: 1 complaints (17% of all); manufacturer bulletins for this component: 1.
Engines and transmissions
US-market versions per EPA. On the right: how many NHTSA complaints name this engine or transmission type.
- 2 L · petrol · turbo · 4 cyl
- 3 L · petrol · turbo · 6 cyl
- automatic, 8-speed
Drive: AWD
Symptoms owners describe
How many of the 6 NHTSA complaints mention each symptom (automatic count from complaint text; one complaint can mention several).
Components owners complain about
| Component | Owner complaints | involving a crash | Technical service bulletins (TSB) |
|---|---|---|---|
| Engine | 2 | 0 | 9 |
| Seat belts | 2 | 0 | 1 |
| Suspension | 1 | 0 | 4 |
| Powertrain | 1 | 0 | 1 |
| Equipment | 0 | 0 | 66 |
| Electrical system | 0 | 0 | 45 |
| Structure | 0 | 0 | 25 |
| Visibility | 0 | 0 | 21 |
| Engine and cooling | 0 | 0 | 11 |
| Steering | 0 | 0 | 10 |
| Air bags | 0 | 0 | 9 |
| Lane departure | 0 | 0 | 7 |
| Exterior lighting | 0 | 0 | 6 |
| Service brakes | 0 | 0 | 6 |
What owners report
Short excerpts of NHTSA complaints in the original wording. These are owner statements not verified by NHTSA; personal data removed.
The result is severe oil pressure loss and engine failure. This is uncommon for a vehicle that has 65k miles. The engine failure comes without warning; there are no check engine light warnings.
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.
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.
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.
- 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 independent service center?
When owners complained
NHTSA complaints by filing year. The peak shows at what age the problems show up most.
Comparison
By complaint count this model year ranks 1,633 of 2,102 model years in the NHTSA data (among the 22% least complained about).
On average one model year of the X4 has 7 complaints (11 years in the data). This year has 6, about average.
What to check before buying
- Engine. Cold start, unusual noises, oil leaks and engine codes.
- Seat belts. Belt pretensioners after airbag deployment, SRS codes.
- Suspension. Wheel alignment, control arms, subframe, even tire wear.
- Powertrain. Shift quality under load, harsh shifts, transmission codes, CV joints.
Manufacturer service bulletins
Bulletin titles as filed with NHTSA.
- The manual starting of electronic engine oil level measurement from inside the vehicle, usually…
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.
- The EVAP systems purge (vent) valve limited warranty for defects in materials and / or workmanship has…
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.
- The EVAP systems purge (vent) valve limited warranty for defects in materials or workmanship has been…
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.
- 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.
- The limited warranty for the Knee Air Bag wire harness repair cable procedure for defects in materials and…
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…
- While driving the vehicle on normal roads at10mph and above, a "cracking" sound from the top of the…
While driving the vehicle on normal roads at10mph and above, a "cracking" sound from the top of the B-pillar(s) is heard.
- During inspection and/or diagnosis there is noticeable dirt/grease buildup on the axles near the inner…
During inspection and/or diagnosis there is noticeable dirt/grease buildup on the axles near the inner and/o router CV boots.
- One or more of the LED daytime running lights are dim or discolored
- An interference noise (groaning noise) can be heard from within the heating and air-conditioning unit in…
An interference noise (groaning noise) can be heard from within the heating and air-conditioning unit in thecenter of the instrument panel. The groaning noise always occurs when either a ventilation flap, air…
- The basic conditions for initializing the power windows are not met
- The Check Control message below appears even though the coolant level is not below minimum when theengine…
The Check Control message below appears even though the coolant level is not below minimum when theengine is cold. Check Control message (ID 166): Top up coolant.
- The Central Information Display goes black intermittently due to resets of the Head Unit (HU-H3)
FaultB7F8F9 ÃÂâÃÂÃÂÃÂàÃÂâÃÂÃÂÃÂÃÂHU-H: ResetÃÂâÃÂÃÂÃÂàwill be stored in the HU-H3.
NHTSA lists 168 bulletins for this year; the 12 newest are shown here.
Other years of this model
Questions and answers
What are the most common problems with the 2021 BMW X4?
Owner complaints to NHTSA most often mention: engine, seat belts, suspension. Total complaints: 6. The most frequent symptoms in complaint texts: seat belts (33%), warning lights, check engine (33%), engine failure or replacement (17%).
How many service bulletins (TSB) were issued for the 2021 BMW X4?
NHTSA lists 168 manufacturer service bulletins for this year. A bulletin tells dealers how to diagnose or fix a known issue; it is not a recall.
Should I buy a 2021 BMW X4 from a US auction?
Owner complaints describe defects, not crash damage. Before bidding, check the components listed above and review the lot photos: VinWind builds a report of visible and hidden damage by VIN.
Other 2021 models
Read also
Sources: public NHTSA data (USA): service bulletins and owner complaints; YouTube: links to videos credited to their authors. Complaints are owner statements not verified by NHTSA, and describe defects rather than crash damage. Data updated 2026-11-04.