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Ford Mustang Reverse Light Bulb Replacement Guide
How to change a burnt out reverse light bulb in the rear bumper cover of a 6th generation 2015 to 2022 Mustang.

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2019 Ford Mustang
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Rear Bumper Cover
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Reverse Light Housing
This automotive maintenance tutorial was specifically written to assist owners of the S550 sixth generation 2015, 2016, 2017, 2018, 2019, 2020, 2021 and 2022 Ford Mustang in changing a burnt out reverse light bulb (also known as the backup or back-up light) in the housing attached to the bottom of the rear bumper cover.

(The 7th generation S650 Ford Mustang is supposed to be released in 2022 as a 2023 model year vehicle.)

Owners of other Ford and Lincoln vehicles such as the Fusion, Taurus, Escape, EcoSport, Flex, Expedition, Bronco, Ranger, Transit, F-150, C-Max, Fiesta, Focus, Edge, MKZ, Continental, Corsair, Nautilus, Aviator and Navigator may also find these DIY instructions to be helpful.

The compatible replacement wedge base light bulb part number is 3157 (also known as 3157K or P27/7W).

If you would like to have a brighter reverse light that will also last much longer than the traditional incandescent bulb before burning out, consider installing a 3157 LED bulb.

No tools are needed to access and replace the bulb.



 

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Look Under Bumper
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1/4 Turn Counterclockwise
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Pull Out Bulb Socket
Slide under the rear bumper cover of the car and locate the tan / pale orange colored plastic light bulb socket situated in the center of the reverse light housing.

Rotate the base of the bulb socket 1/4 turn in the counterclockwise direction before pulling it straight out of the housing.

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Bulb Socket Removed
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Old Light Bulb Exposed
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Pull Out Old Light Bulb
If the old light bulb was recently illuminated, be careful when you remove it. The bulb might still be hot enough to burn your fingers.

Carefully pull the old light bulb straight out of the socket.

If the old bulb is stubborn or stuck in place due to rust or debris, put on some protective gloves and try gently wiggling the bulb back and forth in the socket while pulling it straight out.

Avoid using excessive pressure on the old bulb to prevent from having it break between your fingers.

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Old OEM Light Bulb
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Push In New Light Bulb
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Empty Light Housing
The OEM (original equipment manufacturer) light bulb in this 2019 Mustang convertible was a Sylvania 3157K (also known as a P27/7W).

Push a new number 3157 wedge base light bulb straight into the socket.

Clean off the incandescent halogen bulb with a paper towel and some rubbing alcohol. If there is any grease or dirt on the new bulb, it could create a hot spot and cause the bulb to fail prematurely.

If you'd like to have a much brighter reverse light for extra safety that will also last a very long time, install a compatible replacement 3157 LED bulb.

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1/4 Turn Clockwise - Lock
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New Bulb Installed
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Bulb Change Complete
Re-insert the bulb socket into the housing and rotate it 1/4 turn in the clockwise direction to secure it into place.

Double check that the bulb socket is securely in place before moving on to the next steps.

To test the new light bulb, have an assistant shift the gear selector from "Park" to "Reverse".

Tip - If you installed an LED bulb and it doesn't work, try removing the bulb from the socket, rotate it 180 degrees and push it back into its socket. Some LED bulbs are "polarized" and will only work when the "+" positive and "-" negative electrical contacts are in the correct orientation. If the bulb still doesn't turn on, check your fuse box for a blown electrical fuse.

Don't forget to write down the bulb change in your vehicle's service records.

(FYI - The brake and rear turn signal tail lights are composed of LED bulbs that should last the lifetime of the vehicle.)

For more, please check out all of the 2015-2022 Ford Mustang DIY Repair & Maintenance Guides.
 

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