Owners of other Mitsubishi vehicles such as the Outlander Sport, Eclipse Cross, Mirage, Mirage G4, Lancer, ASX, Montero Sport, Pajero, Xpander, Strada and RVR may also find these DIY instructions to be helpful.

The compatible replacement festoon style light bulb is part number DE3175 which is available from various manufacturers such as Sylvania, Bosch, GE and Philips.

If you'd like to have a brighter cargo area light that will also last much longer before burning out like the traditional incandescent bulb, install a DE3175 LED unit.

The OEM (original equipment manufacturer) light bulb was marked as part number Toshiba A12V8W.)

The only tool needed to remove the lens cover and access the bulb socket is either a small plastic pry bar tool or a flat head screwdriver.

The first step is to open the tailgate door to access the cargo area.

Then locate the small notch on the rear edge of the translucent plastic lens cover just in front of the "On / Off / Door" sliding switch.

Very gently and carefully pry out the rear edge of the lens cover to release the two retaining tabs.

Try to avoid using excessive force. The lens cover's retaining clips should pop out relatively easily.

Pull out the front edge of the lens cover from the housing. There are two more retaining tabs on the front edge.

Set the lens cover aside in a safe place.

Gently pull back the flexible metal electrical contact on the left (driver) side of the bulb socket.

Pull the old light bulb straight out of the socket.

Install a new number DE3175 festoon style light bulb into the socket.

If you'd like to have a brighter cargo area light that will last for much longer than the traditional incandescent bulb, install a compatible replacement DE3175 LED unit.

Make sure the new bulb is securely installed in between the two electrical contacts.

To test the new bulb, slide the switch to the "ON" position.

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 the socket. Some LED bulbs are "polarized" and will only work when the "+" positive and "-" negative electrical contacts are in the correct orientation.

You should feel or hear the four retaining tabs "click" securely into the opening.

I recommend sliding the "On / Off / Door" switch to the "Door" position so that the cargo light will illuminate when a passenger door or the tailgate door is opened.

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

Please check out all of the 2014-2021 Mitsubishi Outlander DIY Repair & Maintenance Guides.