2021 BMW X3 Driver assistance Problems

Lane keep assist performance has been degrading to the point that it very quickly disables itself when overcorrecting or an oscillation of the steering wheel is developed while system is trying to keep the car inside the lane (which eventually also disables the system). System always had a bit of “bounce” between the two sides of the lane and struggled to keep the vehicle exactly in the middle of the lane. But it is much worse now and I am now more often than not disabling it. System feels unsafe now. The KAFAS (camera) module is having random faults now that disable the system but go away and Lane Assist can be re-engaged without any change in the performance I described above. As an engineer I would simply call the Lane Assist control algorithm unstable with an oscillation that gets amplified. I’ve done simple tests where I center the vehicle inside the lane, engage the feature, and take my hands off the steering wheel (vehicle has some limited hands free capability—goal is to eliminate any disturbance from my hands to be the potential trigger for the oscillation). I used to be able to do this and now it rarely works and forces me to quickly take over. Another observation has been that the camera is also used to follow a vehicle ahead of me (in lieu of centering in the lane) and this rarely works now to the point of trusting it. Nothing recent has changed on the vehicle. At first I thought it may be a wheel alignment problem but when the camera module started to have sporadic errors I eliminated that root cause (recall that Lane Assist system always oscillated when engaged, but was definitely usable before). Seems like both problems originate at the camera module. Vehicle did have a windshield replacement and camera was recalibrated many months before this problem developed. Performance was the same immediately before and after replacement.

NHTSA ID

11748083

Incident

Apr 1, 2026

The contact owns a 2021 BMW X3. The contact stated that while reversing, the vehicle lost motive power. The check engine warning light was illuminated. The vehicle had decelerated and was jerking abnormally. There was an abnormal flickering sound coming from the vehicle. The vehicle was taken to an independent mechanic who retrieved codes related to computer failure. The local dealer was not contacted. The vehicle was not diagnosed or repaired. The manufacturer was not notified of the failure. The failure mileage was approximately 101,000.

NHTSA ID

11680321

Incident

Mar 1, 2025

Mileage

101,000 mi

Per the manufacturer, the car requires an oil change every 10,000 miles. However, the engine has a known defect to the manufacturer so that the car only makes it to about 6000 miles before you have to do an oil change. And sometimes the car doesn’t alert you. So your engine could possibly burn up and catch fire. Also, it’s a known issue to them that the back up camera malfunctions suddenly. So it’s really like you don’t have a back up camera at all.

NHTSA ID

11670316

Incident

Feb 21, 2025

Constant emergency braking when I’m not near another vehicle.

NHTSA ID

11659861

Incident

Aug 1, 2024

Upon starting the vehicle, the electronic dashboard comes on, declares “Reduced Driver Assistance” then about 15 seconds later, the entire dashboard goes dark and won’t come back on until the car has been shut down for several minutes. This sequence of events happens 95% of the time that I start the car. Upon restart, the dashboard will stay on about 40% of the time, the other 60% it shuts off again. While I can still see my speed in the heads up display, I have no idea how much gas I have, I can’t get any information from the dahsboard and I can’t use the cruise control. I’ve read about other owners of the 2021 BMW X3 M40i having this same issue however the dealership seems to have no idea and wants me to spend $1,000 in diagnostics to see if they can find the problem….then I would have to pay to have it fixed as well. This seems like a pretty big safety issue.

NHTSA ID

11633069

Incident

Jul 15, 2024

The malfunction involves the collision warning system and sudden braking functionality. The dealership inspection identified a problem with the KAFAS (camera) unit, specifically its housing being deformed from heat, which affected the functionality of the collision sensor and caused the system to malfunction intermittently. The component is still installed in the vehicle and available for inspection if required. The system triggered sudden braking without an actual threat, creating a serious risk of being rear-ended by vehicles behind me. This issue has occurred twice in the last month, with no warning or actual collision risk present. Has the problem been reproduced or confirmed by a dealer or independent service center? Yes, the problem was confirmed by the dealership. Their inspection found that the KAFAS camera housing is deformed due to heat exposure, causing malfunction warnings and erroneous braking behavior. They stated this is not a covered warranty issue. Has the vehicle or component been inspected by the manufacturer, police, insurance representatives, or others? The dealership performed an inspection and provided an inspection report, but no other entities (e.g., manufacturer, police, or insurance representatives) have inspected the component or vehicle. Were there any warning lamps, messages, or other symptoms of the problem prior to the failure, and when did they first appear? Yes, the malfunction indicator light for the collision sensor appeared intermittently. The dealership’s report attributes this to the deformation of the KAFAS camera housing due to heat exposure.

NHTSA ID

11629071

Incident

Nov 30, 2024

The functioning of this feature has never worked. We have had a number of near misses in parking lots when exiting a parking space.

NHTSA ID

11624845

Incident

Nov 12, 2024

The contact owns a 2021 BMW X3. The contact stated while driving approximately 3 MPH, and slowing to park the vehicle, the vehicle independently accelerated. The contact stated the brake pedal was depressed. The contact stated no warning light was illuminated. The contact had taken the vehicle to a local dealer, but the vehicle was not diagnosed nor repaired. The manufacturer had been informed of the failure. The failure mileage was 28,307.

NHTSA ID

11550565

Incident

Oct 17, 2023

Mileage

28,307 mi

I was slowly pulling into a parking space and as I applied pressure to the brakes, there was no response. In fact the car seemed to rev up and accelerate, jumping the curb and ramming a tree. I was able to steer away from the tree to avoid hitting the center of the front end, but smashing the left front. Even after hitting the tree the car did not slow and I’m trying to pump the brakes, there was no response… I kept going over a grassy area, across a sidewalk and back into the driveway in front of the building, finally the brakes engaged and the car came to a stop. I was then able to pull into another space safely out of the way. I was so lucky it was only 7:15 am and no pedestrians were around and no other vehicles. So I did not hit anyone and did not injure myself.

NHTSA ID

11520483

Incident

Jan 25, 2023

Traveling on 2 lane road with no cars around, bright day, 2:30pm about 40mph. Emergency braking beeped twice and immediately slammed on the brakes. Not sure what it thought it saw- tree shadows? The feature was set to medium. If another car was behind us it would have slammed into us. 5th time in 2 years. The dealer just shrugs and says to not set it to high responsiveness. This is a bad defect.

NHTSA ID

11516916

Incident

Apr 13, 2023

The car has part analogue part digital display, the MPH is displayed only via the analogue dial in 10 MPH increments. It's difficult to maintain speeds at 25 / 35 /45 /65 mph. The functionality exists to enable the digital speedometer but BMW refuses to code it on. Rather the company directs you to after market coders to enable the functionality. Alternatively you needed to opt to the $1000 optional fully digital display but this was not made clear at the sales process. BMW has a solution for the 2019 / 2020 X3 under SIB 62 07 19 but refuses to acknowledge this at service centers.

NHTSA ID

11427011

Incident

Jul 12, 2021

ON APRIL 12, 2021 I WAS DRIVING MY 2021 BMW X3 AND AS I WAS PULLING UP INTO A PARKING STALL, MY VEHICLE ACCELERATED ON ITS OWN CAUSING MY VEHICLE TO COLLIDE WITH A BRICK WALL.

NHTSA ID

11415588

Incident

Apr 12, 2021

3 TIMES TODAY SHORTLY AFTER ENGAGING CRUISE CONTROL AND SETTING IT TO 75MPH, THE VEHICLE ACCELERATED QUICKLY TO OVER 90MPH AND HAD TO BE MANUALLY DISENGAGED. WHEN THIS HAPPENED, I DID NOT HAVE MY FOOT ON THE GAS AND DIDN'T PRESS ANY OF THE CRUISE CONTROL BUTTONS EXCEPT TO DISENGAGE IT WHEN IT DANGEROUSLY ACCELERATED ON ITS OWN.

NHTSA ID

11414757

Incident

May 1, 2021

Mileage

1,300 mi

MY CAR'S SPEEDOMETER ONLY DISPLAYS SPEED IN 10 MILES INCREMENTS, WHICH MAKES IT NEARLY IMPOSSIBLE TO KNOW EXACT CURRENT SPEED OF THE CAR. FOR EXAMPLE WHEN SPEED IS BETWEEN 50 AND 60 I CAN ONLY GUESS WHAT MY ACTUAL SPEED IS, 52 OR 58. BMW FOR SOME STRANGE REASON SELLS AN OPTIONAL PACKAGE WHICH ENABLES ACCURATE DIGITAL SPEEDOMETER, AND I THINK ACCURATE SPEEDOMETER MUST BE STANDARD. THIS IS A SAFETY ISSUE.

NHTSA ID

11383792

Incident

Dec 16, 2020