Acura MDX 2005 Bulb Size
Bulb size chart
This page covers the 2005 Acura MDX and helps you verify bulb sizes by lighting position, so you can match the correct replacement before you buy. Because trim and lighting package details can vary by market and body style, it is always smart to confirm the bulb type for the exact lamp you are replacing.
For this MDX, the listed bulb sizes include 9005 for the high beam headlight and daytime running light, H11 for the low beam headlight, 921 for the back up reverse light, and 3457 for the front turn signal and parking light. Other common positions use sizes such as 7443R for the brake and tail lights, 7440A for the rear turn signal, and several interior and courtesy lamps with smaller festoon or wedge-style bulbs.
Fitment can differ between trims, option packages, and regional lighting setups, so compare the bulb in your vehicle before ordering, especially if your MDX has been modified or uses aftermarket housings. Halogen bulbs are the factory-style choice for many positions, while LED upgrades may require a different bulb shape, polarity awareness, or added resistors to avoid warning lights or fast flashing. If you are converting from halogen to LED, check beam pattern and housing compatibility, since a bulb that fits physically may still perform poorly in a reflector or projector assembly. The safest approach is to inspect the installed bulb, match the base and size, and then purchase replacements with confidence.
FAQ
What bulb size does the 2005 Acura MDX use for the low beam headlight?
The low beam headlight bulb size listed for the 2005 Acura MDX is H11.
What bulb size is used for the high beam headlight on this MDX?
The high beam headlight bulb size is 9005.
Does the daytime running light use the same bulb as the high beam?
Yes. The daytime running light bulb size listed for this year MDX is also 9005.
What is the reverse light bulb size for the 2005 Acura MDX?
The back up reverse light bulb size is 921.
Which bulb fits the front turn signal on this vehicle?
The front turn signal light bulb size is 3457.
What bulb size is used for the parking light?
The parking light bulb size listed for the 2005 Acura MDX is 3457.
What bulb does the rear turn signal use?
The rear turn signal light bulb size is 7440A.
What are the brake and tail light bulb sizes?
Both the brake light and tail light bulb sizes are listed as 7443R.
Which bulb fits the center high mount stop light?
The center high mount stop light bulb size is 7440.
What bulb size is used for the license plate light?
The license plate light bulb size can be 168 or 917.
What are the dome and glove box bulb sizes?
The dome light bulb size is DE3175, and the glove box light bulb size is DE3021.
Are the interior door and stepwell lights the same size?
Yes. The interior door light and stepwell light bulb sizes are listed as 194 or 7441.
What should I do if my 2005 Acura MDX has a different bulb than the chart?
Check the installed bulb and compare it with the position-specific listing on the page. Trim, package, and market differences can change the fitment, so the bulb in the vehicle is the best final reference.
Can I replace the factory bulbs with LED bulbs?
Yes, many positions can be upgraded to LED, but fitment and function should be checked carefully. Some LEDs may need polarity correction, resistors, or compatible housings to work properly and avoid flicker or warning issues.