BMW 440i Back Up Light Bulb Size

The BMW 440i back up light requires a bulb size of 12177 for the rear lighting assembly. Data for the specified component covers the range from 2017 to 2018.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Bulb Size by Year Range

Years	Bulb Size
2017-2018	12177

Bulb Specifications

Description	Bulb Size
Philips part number. Halogen bulb, specialty application. 12V.	12177

Other Locations

Additional Notes

The BMW 440i uses the 12177 bulb for the back up light across the 2017-2018 model years.
The 12177 is a Philips part number designating a halogen bulb intended for specialty automotive applications.
The 12177 operates at 12 volts, which is standard for automotive electrical systems powered by a lead-acid battery.
Halogen bulbs in specialty applications, such as the 12177, are typically compact in form factor to fit confined housing spaces within the vehicle body.
The consistent use of the same bulb size across both listed model years indicates no mid-cycle change to the back up light specification for the BMW 440i during that period.