The tail light setup on a 2018 Subaru Forester typically uses a dual‑filament bulb for the tail/stop function, but the exact bulb numbers can vary by trim level and market. Check your owner’s manual or the bulb itself to confirm the precise code before purchasing.
To understand which bulb you need, it helps to know that the rear lighting assembly combines several functions (tail, brake, turn, and backup). Depending on your region and trim, Subaru used different bulb codes or even LED assemblies. The guidance below outlines the most common configurations and how to verify the correct part for your car.
Common rear bulb configurations
Below are the bulb types you’re most likely to encounter in a 2018 Forester’s rear lighting assembly. If your vehicle uses LED fixtures, bulbs may not be replaceable in the same way, and you should consult a dealer or service manual for the exact replacement approach.
- Tail/parking and brake light: typically from the 3157 family (3157 or 3157A) in regions where a dual‑filament bulb is used. Some markets may use 7443 for the tail/stop function.
- Turn signal: commonly a 7443 dual‑filament bulb (some trims or regions may use 7440 as an alternative).
- Backup light: often a 921 or 912 type bulb, depending on market and assembly variant.
Because configurations can vary, always verify by inspecting the actual bulb or consulting the owner’s manual for your exact vehicle specification. Using the wrong bulb can affect function or brightness and may violate local regulations.
How to confirm the exact bulb for your Forester
Follow these steps to ensure you buy the correct replacement for your specific car:
- Identify your vehicle’s region and trim level, since bulb codes can differ by market and option packages.
- Open the rear tail light housing to access the bulbs (consult your owner’s manual for the precise steps to remove the lens or access cover).
- Remove the current bulb and read the number printed on the bulb base, or note the socket type if the bulb itself isn’t marked.
- Cross‑check the code with a reputable parts retailer, or contact a Subaru dealer with your VIN to obtain the exact OEM replacement.
If you’re unsure after inspecting, bring the old bulb to a parts store or call the dealership for a lookup. They can confirm the correct bulb code or provide an OEM substitute that matches Subaru’s specifications.
Summary
For a 2018 Subaru Forester, tail light replacements typically involve a 3157 family bulb for tail/stop and a 7443 for the rear turn signal, with a backup light bulb such as 921 or 912 depending on the market. However, regional differences and LED-equipped trims can change the exact part. Always verify by checking the bulb label, the vehicle’s manual, or a dealer lookup to ensure you buy the correct replacement.