2025 Subaru Outback Bulb Size Guide

As an ASE-certified master technician, I know that replacing a burnt-out bulb on your 2025 Subaru Outback is a common maintenance task. Having the correct bulb size information is crucial to avoid extra trips to the parts store. This guide will walk you through all the bulb sizes for your Outback, from headlights to interior lights.

Quick Reference Bulb Size Chart: 2025 Subaru Outback

Subaru has continued to integrate LED lighting across the Outback lineup for 2025, especially on higher trim levels. Base models may still use halogen bulbs in certain locations, so it's essential to identify which type your vehicle has. Most exterior lighting is now a non-serviceable LED unit from the factory.

LED vs. Halogen Upgrade Considerations

For the locations that still use halogen bulbs on the 2025 Outback (like reverse, license plate, and interior lights), upgrading to LED bulbs is a popular choice for improved brightness, longevity, and a modern look.

However, there are a few things to consider:

• CANBUS Errors: While less common on modern Subarus for simple circuits like license plate or reverse lights, some sensitive systems can detect the lower power draw of an LED and assume a bulb is burnt out. This can trigger a "bulb out" warning on the dash. If this happens, a CANBUS-compatible LED bulb with a built-in resistor is required.
• Color Temperature: Match the color temperature (measured in Kelvin) of your new LEDs for a uniform look. A 5000K-6000K rating provides a crisp, neutral to cool white light.
• Adapters & Fitment: For interior bulbs like the festoon-style dome lights, ensure the LED replacement has the correct length (31mm for a DE3175). For wedge-style bulbs like the 921 or 168, ensure the base is the correct T10/T15 size to fit the socket.

How to Replace Each Bulb

Always consult your owner's manual before starting. Disconnect the negative battery terminal for safety.

• Headlights/Fog Lights/Turn Signals (Front): These are integrated LED units. If one fails, the entire assembly needs to be replaced. This is a complex job that requires removing the front bumper cover and is best left to a professional.
• Rear Turn Signal (7440): Open the tailgate. Remove the two bolts holding the tail light assembly on the body. Gently pull the assembly straight back to release the retaining clips. Twist the turn signal socket counter-clockwise, pull it out, replace the bulb, and reinstall.
• Reverse Light (921): These are located in the tailgate itself. Open the access panels on the interior trim of the tailgate. Locate the reverse light socket, twist it counter-clockwise, and pull the bulb straight out of the socket to replace.
• License Plate Light (168): Look for the small plastic housings above the license plate. Use a small, flat-head screwdriver wrapped in a cloth to gently pry the lens cover off. The bulb and socket will be exposed. Pull the old bulb out and insert the new one.
• Interior Dome/Map Lights: Use a plastic trim removal tool to gently pry down the edge of the lens cover. This will prevent scratching the plastic. Once the lens is off, you can access the halogen bulb. For festoon bulbs, gently pry the metal clips apart to release the bulb. For wedge bulbs, pull straight out.

Common Lighting Issues for this Generation

The 2025 Outback is part of the 6th generation, which has heavily relied on integrated LED lighting. The most common issue isn't a bulb burning out but a failure of the entire lighting assembly. Moisture intrusion can cause the internal electronics of the headlight or tail light assembly to fail, leading to flickering or complete loss of function. If you notice condensation inside a lens, it should be addressed immediately under warranty. Since these are expensive to replace out-of-pocket, ensuring they are sealed correctly is key to their longevity.

For an expert diagnosis or professional installation, find a trusted shop on Repairius.