Used for: Back Up Reverse Light Bulb
Used for: Parking Light Bulb, Turn Signal Light Bulb Front
Used for: Side Marker Light Bulb Front
Used for: Turn Signal Light Bulb Rear
Used for: Interior Door Light Bulb, Trunk or Cargo Area Light
This page covers the 2020 Lexus RX 350 and helps you verify the correct bulb sizes by lighting position. Because exterior and interior lamps can differ by trim, market, and package, matching the bulb to the exact location is the safest way to order the right replacement.
For the 2020 RX 350, many lighting functions use LED assemblies, while a few positions still use replaceable bulbs such as the front turn signal, rear turn signal, back up reverse light, and several interior or accent lights. Use the chart below to confirm each bulb by function before buying.
Fitment can vary on the 2020 Lexus RX 350 depending on trim level, lighting package, body style, and regional market, so always compare the bulb position on your vehicle with the listing on this page. Some lamps are factory LED units, which may not use a standard replaceable bulb in the same way halogen systems do. If your RX 350 has been modified with aftermarket LED conversions, the installed bulb may not match the original specification, and you should check the actual bulb in the housing before ordering. When possible, remove the old bulb and compare the base, connector, and shape to the chart to avoid returns and installation delays.
The chart for this page lists the headlight high beam and low beam as LED. That means the headlamp function is handled by an LED assembly rather than a standard replaceable halogen bulb.
The front fog light bulb is listed as LED. In many cases, that means the fog light is part of an LED unit, so you should confirm the exact housing on your vehicle before attempting replacement.
The front turn signal light bulb is listed as 7444NA. This is the bulb reference shown for the front signal position on this year and model.
The rear turn signal light bulb is listed as 7440A. Always match the bulb to the rear signal location, since front and rear turn signals may use different bases or specifications.
The back up reverse light bulb is listed as 921. This is the bulb reference shown for the reverse lamp position on the 2020 Lexus RX 350.
Both the brake light bulb and the center high mount stop light bulb are listed as LED. On many vehicles, that means the light source is integrated into the lamp assembly rather than a simple plug-in bulb.
The license plate light bulb is listed as LED. If the lamp is not working, check whether the issue is the LED unit, the housing, or the wiring rather than assuming a standard bulb swap.
The front side marker light bulb is listed as 168NA, while the rear side marker light bulb is listed as LED. Front and rear positions are different on this model, so do not assume they use the same part.
The parking light bulb is listed as 7444NA and is noted as optional in the raw list. That means the exact setup may depend on trim or lighting configuration.
The chart lists LED for the dome light, map light, glove box light, and interior door light. The trunk or cargo area light is listed as 168. These positions should be checked individually because interior lighting can vary by equipment level.
Some owners do aftermarket LED conversions, but fitment and performance depend on the housing, connector, and vehicle electronics. If your RX 350 was not originally equipped with that setup, verify compatibility carefully before buying.
The best method is to identify the exact lighting position on the vehicle, compare it with the chart on this page, and inspect the installed bulb if the housing is accessible. This is especially important on the 2020 Lexus RX 350 because trim and package differences can change the lighting setup.
