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Mazda MX-5 Miata Reverse Light Bulbs Replacement Guide
How to change a burnt out reverse (back-up) light bulb on a 4th generation 2016 to 2021 Mazda MX-5 Miata.

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Brake & Rear Turn Signal
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Down Low - Reverse Light
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Under Bumper Cover
This automotive maintenance tutorial was specifically written to assist owners of the 4th generation (2016, 2017, 2018, 2019, 2020 & 2021) Mazda MX-5 Miata in changing a burnt out reverse (or "back-up") light bulbs in the rear bumper cover located below the tail light housing that contains the brake, rear turn signal and side marker lights.

Owners of other Mazda vehicles such as the Mazda2 (Demio), Mazda3 (Axela), Mazda5, Mazda6 (Atenza), CX-3, CX-5, CX-7, CX-9, RX-8 and MPV may also find these DIY instructions to be helpful.

The compatible replacement wedge base light bulb part number is 7440 (also known as part # W21W).

If you would like to have brighter reverse lights, install some 7440 LED bulbs.



 

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Reverse Bulb Socket
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1/4 Turn Counterclockwise
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Remove Bulb Socket
The first step is to slide under the back bumper cover.

Locate the rear of the reverse light housing.

Grasp the grey and black plastic bulb socket and rotate it 1/4 turn in the counterclockwise direction before pulling it straight out of the housing.

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Pull Out Old Light Bulb
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Empty Bulb Housing
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Push In New Light Bulb
Gently pull the old light bulb straight out of the socket.

Push a new number 7440 light bulb straight into the socket.

If you would like to have brighter reverse lights that will also last much longer, install some compatible replacement 7440 LED bulbs.

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1/4 Turn Clockwise - Lock
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Bulb Socket Secured
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Test New Reverse Bulb
Re-insert the bulb socket into the housing and rotate it 1/4 turn in the clockwise direction to secure it into place.

To test the new light bulb, have an assistant step on the brake pedal and shift the transmission into reverse.

Be sure to record the bulb change in your vehicle's service records.

For more, check out all of my 2016-2021 Mazda MX-5 Miata DIY Repair & Maintenance Guides.
 

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