2019 Tesla Model 3 Bulb Sizes (Headlight, Tail, Fog)

As an ASE-certified master technician, I get asked a lot about automotive lighting. When it comes to the 2019 Tesla Model 3, the conversation is drastically different from traditional vehicles. Unlike older cars where you can simply swap out a burnt halogen bulb for a few dollars at the parts store, the 2019 Tesla Model 3 relies entirely on advanced, integrated LED technology for its primary lighting systems.

Whether you drive a Standard Range Plus, Long Range, or Performance model, understanding your Model 3’s lighting system is crucial before you attempt any DIY repairs or upgrades.

Quick reference

Because the 2019 Tesla Model 3 uses integrated LED housings, traditional bulb sizes (like H11 or 9005) do not apply to the main exterior lights. If a headlight or tail light fails, the entire housing typically needs to be replaced. However, certain interior and utility lights can be upgraded using modular LED units.

Note: The Standard Range Plus (SR+) trim includes fog light housings, but they may be software-disabled or lack the actual lighting element depending on the specific build date.

LED vs halogen upgrade considerations

In a traditional car, you might worry about CANBUS errors, anti-flicker adapters, or fitting large LED heatsinks into halogen housings. For the 2019 Tesla Model 3, these considerations are mostly irrelevant because the car is 100% LED from the factory.

There are no halogen bulbs to upgrade. However, the aftermarket is full of "upgrade" modules for the trunk, frunk, footwells, and puddle lights. If you choose to upgrade these utility lights to brighter aftermarket LEDs:

• Voltage matters: Ensure the aftermarket LED modules are specifically designed for the Model 3’s 12V system (which was standard in 2019 before Tesla moved to 16V Li-ion systems in newer models).
• No CANBUS issues: Simple plug-and-play LED modules for the interior or trunk will not trigger CANBUS errors, as the computer expects LED resistance anyway.

How to replace each bulb

Since you cannot replace the individual bulbs in the primary lighting fixtures, "replacement" generally means swapping the whole assembly. Here is what you need to know for the few things you can do yourself:

• Headlights (Low/High/DRL/Turn): If the headlight fails, you must replace the entire headlight assembly. This involves removing the front bumper cover. It is highly recommended to have a professional handle this, as the new headlight may need software calibration/provisioning via the car's service mode.
• Fog lights: Similar to headlights, the fog light requires partial removal of the front bumper or wheel well liner to unbolt the assembly.
• Tail lights (Brake/Tail/Turn/Reverse): The Model 3 tail lights are split into outer (body) and inner (trunk lid) assemblies. Removing them involves peeling back the trunk liner, unplugging the harness, and removing a few 8mm nuts. It’s a very straightforward DIY job.
• Side markers (Fender repeaters): The side marker/turn signal camera is one unit. If the light fails, the whole camera unit must be replaced and recalibrated.
• Puddle/Trunk/Frunk lights: Use a plastic trim removal tool to gently pry the small rectangular light fixture out of its slot. Unplug the harness, plug in your brighter aftermarket LED module, and snap it back into place. Takes less than two minutes per light.

Common lighting issues for this generation

The 2019 Model 3 is largely reliable when it comes to the lifespan of the LEDs, but the housings are known for a few distinct issues:

1. Tail light condensation: By far the most common issue on the 2019 Model 3. The outer tail light housings frequently develop moisture and condensation buildup. While a little fog is normal in specific weather, standing water inside the lens is not. This requires a full replacement of the tail light assembly.
2. Headlight LED strip failure: The swooping DRL strip at the top of the headlight housing has been known to yellow or partially burn out over time due to heat and UV degradation. Again, this necessitates a full assembly replacement.
3. Fog light upgrades on SR models: Many owners with SR or SR+ trims find that their fog lights don't work. This isn't a bulb failure; Tesla often omitted the internal LED board or software-locked them on lower trims.

Because of the high voltage systems and complex software integrations in a Tesla, diagnosing electrical failures isn't always as simple as checking a fuse (the Model 3 uses electronic fuses, or "e-fuses," that reset automatically). If you are experiencing persistent lighting failures or need a major assembly replaced and provisioned, don't guess—get professional help.

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