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 being two separate fire risks: an overheating starter motor that can ignite nearby engine compartment materials, and elevated electrical resistance in the 12-volt battery circuit that can also lead to a fire.
On the braking side, a hydraulic brake assist defect can cause the anti-lock braking system to stop functioning and reduce the power assist available when stopping, which raises the risk of a crash in hard-braking situations. There is also a software issue affecting the rearview camera, which can display a reduced or missing image when reversing, leaving the driver with limited visibility behind the vehicle.
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.
We may earn a commission for purchases made through these links.
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.
