Posted on 07/23/2025 by Alla Lighting
Table of Contents
Ready to upgrade your old halogen bulbs? Learn how to replace and complete the installation of LED rear back-up reverse light bulbs. Easy installation and tips!
The halogen exterior light bulbs may be too dim in your 2021 Toyota Tacoma, which can make vision difficult, especially in bad weather or severe driving conditions. Upgrading the old halogen bulbs on your 2021 Toyota Tacoma with new aftermarket LED bulbs can add a great new look to your vehicle and improve visibility at night for a safer driving experience.
If you choose to upgrade your old halogen bulbs to new LED bulbs, it is best to confirm you have the correct replacement LED bulb by referring to the original bulb or the vehicle’s direct owner’s manual.
We will show you how to install your new ALLA Lighting LED bulbs for your back-up reverse light application.
Bulb sizes for the 2021 Toyota Tacoma back-up reverse light bulb is # 921
The reverse lights are located in the rear light housing, beginning by opening the tailgate.
There are two tabs behind the housing and two bolts on the inside to remove the whole assembly.
Use your 10 millimeter wrench to remove the two bolts.
Apply tape to the outside of the housing, hold the tape and pull the housing back to free the locking tabs behind the housing.
We highlight here where the tabs from the housing lock into the frame.
Remove the reverse light socket by turning it counterclockwise.
Pull out the incandescent bulb.
Replace it with the LED and test it.
The LED has a rubber ring to secure it.
Install the LED into the housing and adjust it until the clips face out at the three o’clock and nine o’clock positions.
Line up the locking tabs in the housing with the frame and push the housing in to lock them.
Replace and tighten the two 10 millimeter bolts.
Repeat the same steps on the other side.
These new LED bulbs are much better at lighting up the area around the back of your car for safe reversing.
Check out our Step by Step installation video!
Congratulations! Your LED back up reverse light installation is now complete in your 2021 Toyota Tacoma. If you experienced any issues during your installation and unable to complete installation, please contact us for assistance. If the LED bulbs are experiencing hyper-flashing, flickering, an error code issues, then load resistors for this application will be required to be installed. These issues can occur due to the LEDs low current nature, which draws much less current than original stock halogen bulbs.
Please feel free to contact us at service@allalighting.com for assistance. Our team of highly trained representatives will be available to assist and provide the best solution. May also visit us at www.allalighting.com
Looking for more LED upgrades for your 2021 Toyota Tacoma. Check out the below bulb guide! For your reference only. All information below is not 100% guaranteed accurate. Please confirm the original bulb part numbers by referring to the original bulb or the vehicle’s direct owner’s manual prior to purchase.
Front Exterior Lights
Front Fog Light Bulb. Stock #: H16 / LED
Front Sidemarker Light Bulb. Stock #: 12961 (W5W)
Front Turn Signal Light Bulb. Stock #: 7440NA
High Beam and Low Beam Headlight Bulb. Stock #: LED
High Beam Headlight Bulb. Stock #: H9
Low Beam Headlight Bulb. Stock #: H11
Rear Exterior Lights
Back Up Light Bulb. Stock #: 921
Brake Light Bulb. Stock #: 7443
Center High Mount Stop Light Bulb. Stock #: 168
License Plate Light Bulb. Stock #: 12961 (W5W)
Rear Side marker Light Bulb. Stock #: 7443
Rear Turn Signal Light Bulb. Stock #: 7443
Tail Light Bulb. Stock #: 7443
Interior Lights
Category: Home, How to Install, Toyota, Toyota Tacoma
Subscribe now to keep reading and get access to the full archive.