Owners of other Subaru vehicles such as the Forester, Impreza, Legacy, XV Crosstrek, WRX, BRZ, SVX, Tribeca, Exiga, Trezia, Levorg and Baja may also find these DIY instructions to be helpful.

The compatible replacement light bulb part numbers are as follows: Rear Turn Signal # 7440A (or WY21W), Rear Side Marker 2825 (or W5W) and Reverse Light # 921.

The tools needed to access and replace the light bulbs include a Phillips head screwdriver, a 10mm socket with a 1/4" drive ratchet and a plastic pry bar tool.

Locate the two black plastic screws on the plastic trim cover that covers the inner part of the tail light housing.

Loosen the black plastic screws by turning them in the counterclockwise direction with the Phillips head screwdriver.

Set the two fasteners aside in a safe place.

Use the plastic automotive panel pry bar tool to gently pull the trim cover off the tail light assembly.

Once the trim cover is out of the way, you'll see two black metal bolts.

They can be loosened with either a Phillips head screwdriver or a 10mm socket and a 1/4" drive ratchet.

I recommend using a socket with a ratchet since it is much easier to loosen a stubborn bolt.

Loosen the two bolts by turning them in the counterclockwise direction with a 10mm socket and a 1/4" drive ratchet.

The tail light housing is still held in place by a peg inserted into a grommet and a slot attached to the head of a pop rivet.

Carefully pull the tail light housing straight off the rear corner of the SUV.

If you have trouble removing the tail light assembly, use the plastic pry bar tool to carefully pry along the front edge of the housing and the painted metal body rear quarter panel.

Turn over the housing to access the bulb socket.

Place a towel down on the rear bumper to protect the paint and the plastic lens cover from being scratched.

(The brake lights are LED bulbs that should last the life time of the vehicle.)

Carefully pull the old rear turn signal light bulb straight out of the socket.

If you have trouble removing a stubborn old light bulb, try gently wiggling the light bulb back and forth while pulling it straight out.

Re-insert the bulb socket into the housing and rotate it 1/4 turn in the clockwise direction to secure it into place.

The smaller grey plastic socket contains the rear side marker light bulb.

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

Push a new number 2825 (also known as part # W5W) light bulb straight into the socket.

If you would like to have brighter rear side marker lights, install some compatible 2825 LED bulbs.

Line up the slot and the white plastic peg or "spike" on the back side of the tail light housing with their corresponding grommet and white plastic pop rivet on the rear corner of the SUV.

Carefully slide the tail light assembly back into place.

(You may also use a Phillips head screwdriver if necessary.)

Try to avoid over tightening the bolts to prevent from cracking the black plastic inner edge of the tail light housing.

Re-insert the two black plastic fasteners and pop in the plastic screws to secure them in place.

Open the tailgate door to access the cargo area.

Locate the rectangular shaped access cover on the underside of the tailgate.

Insert a flathead screwdriver into the small notch on the bottom edge of the access cover.

Gently pry out the access cover and set it aside in a safe place.

Push a new number 921 miniature wedge base light bulb straight into the socket.

If you would like to have brighter reverse lights, install some compatible 921 LED bulbs.

Re-insert the bulb socket into the housing and rotate it 1/4 turn in the clockwise direction to secure it into place.

Then gently snap in the bottom edge of the access cover back into the tailgate's interior panel.

To test the new tail light bulbs, have an assistant step on the brake pedal, activate the hazard signals, turn on the parking lights and place the transmission in reverse.

For more, please check out all of my 2015-2018 Subaru Outback DIY Repair & Maintenance Guides.