For the 2020 Chevrolet Impala, headlight bulb fitment depends on the headlight type. Models with halogen headlights use a 9005 bulb for both the low beam and high beam. Models equipped with HID headlights use a D3S bulb for both functions.
The daytime running light also varies by configuration: halogen-headlight models use a 9005 bulb, while HID-headlight models use LED lighting. No fog light bulb fitment is listed for this vehicle.
Other notable exterior bulbs include a 7444NA front turn signal and parking light, a 7440 reverse light, and a 7443R brake light. The center high-mounted stop light is LED. Rear lighting uses several listed applications, including 194, 7441, and 7443R for the tail light, plus a 7443 rear turn signal. Front and rear side markers use 194NA and 7443A bulbs, respectively. License plate lighting is listed with either 2825 or 98 bulbs. Check whether the vehicle has halogen or HID headlights before ordering headlight or daytime running light replacements.