NHTSA (USA)Critical
At a glance
What can fail
The starter motor may overheat due to electrical overload after repeated starting attempts.
What the fix does
The engine starter will be replaced at no cost to you.
This page covers 4 recalls and EPA fuel economy for the 2021 BMW 840i.
25 mpg combined
9.4 L/100km
Subcompact Cars
Fuel economy data from fueleconomy.gov (EPA / U.S. Dept. of Energy). Annual cost based on 15,000 mi/yr at 55% city driving and current fuel prices. MPG is U.S. gallons; L/100km converted.
The 2021 BMW 840i has 4 recalls, the most serious involving the starter motor, which can overheat from electrical overload and ignite nearby materials in the engine compartment, raising the risk of an underhood fire.
A second fire-related concern involves the 12-volt battery, where increased electrical resistance in the battery circuit can also lead to fire. On the braking side, a hydraulic brake assist defect can cause the anti-lock braking system to lose function and reduce the power assistance the brakes normally provide, leaving the driver with significantly less stopping force than expected, particularly in an emergency. There is also a camera software issue where the rearview image may be missing or reduced when reversing, leaving a blind spot behind the vehicle that the driver may not realize exists if relying on the screen alone.
At a glance
What can fail
The starter motor may overheat due to electrical overload after repeated starting attempts.
What the fix does
The engine starter will be replaced at no cost to you.
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Summarized — see the official notice for exact wording, dates, and contacts.
At a glance
What can fail
When shifting into Reverse, the rearview camera display may show a partially obscured image or fail to illuminate, reducing rear visibility.
What the fix does
Dealers will inspect and update the rearview camera software as needed at no cost.
Summarized — see the official notice for exact wording, dates, and contacts.
At a glance
What can fail
The rotor and shaft inside the brake system may not be properly welded and could separate during hard braking, causing loss of ABS and braking assistance.
What the fix does
Dealers will replace the integrated brake system at no cost to you.
Summarized — see the official notice for exact wording, dates, and contacts.
At a glance
What can fail
The connection between the 48-volt battery and starter-generator may not be properly assembled, causing increased electrical resistance at the connection points.
What the fix does
Dealers will inspect the 48-volt battery and starter-generator connection and replace it if necessary, at no cost.
Summarized — see the official notice for exact wording, dates, and contacts.