2021 Toyota Tundra Bulb Sizes
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Quick reference
| Location | Bulb Size | Type |
|---|---|---|
| Low Beam (Halogen) | H11 | Halogen |
| Low Beam (LED OEM) | N/A (Integrated) | LED |
| High Beam (Halogen) | 9005 | Halogen |
| High Beam (LED OEM) | N/A (Integrated) | LED |
| Fog Light | H16 (Halogen) | Halogen |
| Fog Light (LED OEM) | N/A (Integrated) | LED |
| DRL | 7440/7443 | Incandescent (May vary by trim/package) |
| Front Turn Signal | 7440/7443 | Incandescent |
| Rear Turn Signal | 7440 | Incandescent |
| Brake Light | 7443 | Incandescent |
| Tail Light | 7443 | Incandescent |
| Reverse Light | 921 | Incandescent |
| License Plate | 168/194 | Incandescent |
| Front Side Marker | 168/194 | Incandescent |
| Rear Side Marker | (Integrated into tail light assembly - often LED) | LED |
| Dome Light | 578 | Incandescent |
| Map Light (Front) | 168/194 | Incandescent |
| Map Light (Rear) | 168/194 | Incandescent |
The 2021 Toyota Tundra offers a mix of lighting technologies, with lower trims typically featuring halogen bulbs and higher trims or specific packages utilizing LED lighting from the factory. It's important to verify your specific Tundra's lighting setup as there can be variations.
For example, SR and SR5 models commonly come with halogen headlights, while Limited, Platinum, 1794 Edition, and TRD Pro often feature LED headlights with integrated low and high beams. Fog lights follow a similar pattern, with halogen on lower trims and LED on higher trims or available as an upgrade. DRLs and turn signals are generally incandescent across most trims unless a specific LED package was chosen.
LED vs halogen upgrade considerations
Upgrading your 2021 Tundra's halogen bulbs to LED can significantly improve visibility and give your truck a more modern look. However, there are a few important considerations:
- CANBUS Errors: Modern vehicles, including the Tundra, use a CANBUS (Controller Area Network Bus) system to monitor various electrical components. LED bulbs draw less power than their halogen counterparts. This power difference can sometimes trigger
More specs for the 2021 Toyota Tundra
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 Toyota Tundra 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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Values can vary by engine, trim and build date; check your VIN-specific service information. Updated 2026-06-23.