Used for: Back Up Reverse Light Bulb
Used for: License Plate Light Bulb
Used for: License Plate Light Bulb
Used for: Parking Light Bulb(without adaptive lighting), Side Marker Light Bulb Front(without adaptive lighting)
Used for: Turn Signal Light Bulb Front(without adaptive lighting), Turn Signal Light Bulb Rear
Used for: Dome Light Bulb, Map Light Bulb, Trunk or Cargo Area Light
This 2017 Mazda CX-9 bulb size guide is designed to help you verify the correct bulbs by lighting position, so you can match the right part before you buy. Whether you are replacing a headlight, a tail lamp, or an interior bulb, this page organizes the common bulb types used on the CX-9 by location to make fitment checks faster and easier.
The 2017 Mazda CX-9 may use different lighting setups depending on trim, market, and body style, so the exact bulb type can vary in some positions. Use the bulb chart on this page as a position-by-position reference for exterior and interior lighting, including LED-equipped lamps and the few replaceable bulb locations that still use traditional bulb numbers.
For best results, compare your vehicle’s trim and lighting package before ordering, especially if your CX-9 has adaptive lighting or a non-adaptive front lamp setup. Some positions are listed as LED, while others use replaceable bulbs such as 921, 7440A, DE3175, 2825/98, or 2827 depending on the lamp location. If you are converting from halogen to LED aftermarket bulbs, check polarity, bulb depth, and heat management, since not every LED retrofit fits or performs the same way. When possible, remove the installed bulb and confirm the number printed on the base before purchase, because small package differences can change fitment even on the same 2017 Mazda CX-9.
The low beam headlight is listed as LED on this page. Because the CX-9 can vary by lighting package, verify the exact headlamp assembly before ordering a replacement.
The high beam headlight is listed as LED. If your vehicle has a different market-specific lighting setup, confirm the installed assembly before buying parts.
For front turn signals without adaptive lighting, the bulb listed is 7440A.
For front turn signals with adaptive lighting, the page lists LED rather than a replaceable bulb number.
The rear turn signal bulb is listed as 7440A.
The back up reverse light bulb is listed as 921.
The license plate light bulb is listed as 2825 or 98.
Those interior positions are all listed as DE3175 on this page.
Yes. The brake light bulb and tail light bulb are both listed as LED.
The daytime running light bulb is listed as LED, so it is not shown here as a standard replaceable bulb number.
Check whether your CX-9 has adaptive lighting, confirm the trim and lighting package, and compare the installed bulb or lamp assembly before ordering. This is especially important for front lighting positions.
Yes, in some positions aftermarket LED conversions may be used, but fitment can depend on bulb depth, connector style, and heat control. Always verify the original bulb number first and make sure the replacement is compatible with your housing.
