2021 Tesla Model 3 Bulb Sizes (Headlight, Tail, Fog)
A complete guide to the 2021 Tesla Model 3 bulb sizes
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As an ASE-certified master technician, I've seen firsthand how an EV's lighting system is different from the traditional halogen setups of the past. The 2021 Tesla Model 3 is a great example of this, with its complete reliance on integrated LED modules. This means that for the most part, you won't be swapping out individual bulbs like you would on an older vehicle.
Quick reference
| Location | Bulb Size | Type |
|---|---|---|
| Low Beam Headlight | LED Module | LED |
| High Beam Headlight | LED Module | LED |
| Fog Light | LED Module | LED |
| Daytime Running Light (DRL) | LED Module | LED |
| Front Turn Signal | LED Module | LED |
| Rear Turn Signal | LED Module | LED |
| Brake Light | LED Module | LED |
| Tail Light | LED Module | LED |
| Reverse Light | LED Module | LED |
| License Plate Light | LED Module | LED |
| Side Marker Lights | LED Module | LED |
| Dome/Map Lights | LED Module | LED |
LED vs halogen upgrade considerations
The 2021 Tesla Model 3 comes from the factory with a full LED lighting system. This is great for visibility and energy efficiency, but it also means that there are no halogen bulbs to upgrade. All of the exterior and interior lights are powered by integrated LED modules that are not designed to be user-serviceable. If a light goes out, the entire assembly needs to be replaced.
Because the Model 3's lighting system is entirely LED-based, you won't need to worry about CANBUS errors or needing special adapters, which are common concerns when upgrading from halogen to LED on other vehicles.
How to replace each bulb
Since every light on the 2021 Tesla Model 3 is an integrated LED module, the replacement process is much more involved than simply swapping out a bulb. If you're not comfortable with this level of repair, it's best to consult a professional.
- Headlights and Fog Lights: These are part of a sealed assembly. The entire headlight or fog light unit must be replaced if a light fails. This often requires removing the front bumper.
- Tail Lights: Similar to the headlights, the tail lights are a single sealed unit. If any part of the tail light, brake light, or turn signal fails, the entire assembly needs to be replaced. This involves removing the trunk lining to access the mounting bolts.
- License Plate and Side Marker Lights: These are also sealed LED modules that require the replacement of the entire unit if they fail.
- Interior Lights: The dome and map lights in the Model 3 are also integrated LEDs. Replacing them requires removing the headliner and the entire overhead console.
Common lighting issues for this generation
The 2021 Tesla Model 3 is known for its reliable lighting system. However, like any vehicle, it can have some issues. The most common problem is condensation inside the headlight or tail light assemblies. This can cause the LEDs to fail prematurely. If you notice condensation in your lights, it's best to have the assembly replaced as soon as possible.
Another less common issue is a flickering light. This is usually caused by a faulty control module rather than a problem with the LED itself. Diagnosing and fixing this requires specialized equipment and knowledge of the vehicle's electrical system.
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More specs for the 2021 Tesla Model 3
Oil Capacity & Filter
Capacity, weight, filter PN, drain plug torque, change interval.
Fluid Type Specs
Engine oil, coolant, ATF, diff, brake, PS, DEF — with OEM spec numbers.
Coolant Capacity & Type
Total system capacity, OEM coolant spec, flush interval, bleed tips.
Transmission Fluid & Service
Trans model, fluid spec, capacity, filter PN, service interval.
Torque Specifications
Lug nuts, drain plug, caliper, axle nut, plug, key fasteners.
Brake Pad & Rotor Specs
Pad PNs, rotor size, min thickness, caliper torque.
Tire Size & Pressure
OEM size, cold psi, bolt pattern, wheel size, TPMS.
Battery Size & Group
Group size, CCA, AGM/flooded, dimensions, reset note.
A/C Refrigerant & Oil
R-134a or R-1234yf, charge oz, PAG oil spec.
Factory Maintenance Schedule
Service intervals by mileage, severe-duty notes, known issues.
Towing Capacity & Payload
Max tow, payload, GVWR/GCWR, hitch class by trim.
Fuse Box Diagram & Amperage
Fuse box locations, layout, amps, and what each fuse controls.
Serpentine Belt Routing & Length
Belt routing, length, rib count, OEM + aftermarket PNs.
Wheel Alignment Specifications
Camber, caster, toe ranges (front & rear), adjustability notes.
Paint Color Codes
All factory colors with paint codes, sticker location, touch-up tips.
Wiper Blade Sizes
Driver/passenger/rear blade size, attachment, OEM + cross-refs.
Spark Plug Type & Gap
Plug PN, gap, torque, interval by engine.
Transmission & Axle Gear Ratios
Trans gear ratios, axle ratios, RPO codes, tow vs MPG impact.
Key Fob Programming
DIY programming steps, FCC ID, fob PN, battery, transponder.
Same spec — other model years
Maintenance & repair guides
2021 Tesla Model 3 Maintenance Schedule →
Available maintenance guidance; confirm the manufacturer schedule.
Repair planning references →
Plan the scope of work; detailed procedures need configuration-matched evidence.
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