2021 Honda Civic Bulb Sizes
AI-generated reference. Always verify torque values, fluid capacities, intervals, and procedures against the manufacturer's service manual or OEM repair information before performing work. Repairius is not liable for damage from acting on this content without verification.
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Quick reference
| Location | Bulb Size | Type |
|---|---|---|
| Low Beam (Halogen) | H11 | Halogen |
| Low Beam (LED/HID) | --- | LED/HID (OEM specific) |
| High Beam (Halogen) | 9005 | Halogen |
| High Beam (LED/HID) | --- | LED/HID (OEM specific) |
| Fog Light (Halogen) | H8/H11 | Halogen |
| Fog Light (LED) | --- | LED (OEM specific) |
| Daytime Running Light (DRL) (Halogen) | W21/5W (7443) | Halogen |
| Daytime Running Light (DRL) (LED) | --- | LED (OEM specific) |
| Front Turn Signal (Halogen) | W21W (7440) | Halogen |
| Front Turn Signal (LED) | --- | LED (OEM specific) |
| Rear Turn Signal | W21W (7440) | Halogen |
| Brake Light | W21W (7440) | Halogen |
| Tail Light | 7443K | Halogen |
| Reverse Light | W16W (921) | Halogen |
| License Plate Light | 168/194 | Incandescent |
| Front Side Marker | 168/194 | Incandescent |
| Dome Light | 31mm festoon | Incandescent |
| Map Light | 168/194 | Incandescent |
The 2021 Honda Civic offers a mix of halogen and LED lighting depending on the trim level. Lower trims typically feature halogen bulbs for most exterior lighting, while higher trims like the Touring or Si often come equipped with full LED headlights, fog lights, and sometimes LED DRLs and turn signals from the factory. It's important to check your specific trim level to confirm the OEM bulb type, especially for the headlights and fog lights, as these can be complex LED or HID projector units that are not easily replaceable with standard bulbs.
LED vs halogen upgrade considerations
Upgrading your 2021 Honda Civic from halogen to LED bulbs can significantly improve visibility and give your car a modern look. However, there are several important factors to consider before making the switch.
CANBUS Errors: Modern vehicles, including the 2021 Honda Civic, utilize a Controller Area Network Bus (CANBUS) system to monitor various electrical components, including lighting. When you replace a halogen bulb with an LED, the LED's lower power draw can be interpreted by the CANBUS system as a burned-out bulb, triggering a
More specs for the 2021 Honda Civic
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 Honda Civic 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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