The outer rear brake/taillights on most 2016 Kia Optima models use a 3157 dual-filament bulb, while the center high‑mount brake lamp (CHMSL) is often an LED unit; if your CHMSL uses a replaceable bulb, it’s typically a small wedge-style bulb such as a T10/194, depending on trim. Always verify for your exact build.
Bulb sizes by rear light assembly
To ensure you get the right replacement, identify which rear light you’re servicing and verify its bulb type. Below are the common sizes seen on 2016 Optimas. Note that sizes can vary by market and trim, so always double-check the bulb or owner’s manual.
Outer rear brake/taillights
This list covers the bulbs in the outer rear lamp assemblies that provide both tail and brake functions.
- 3157 dual‑filament (12V) bulb for the outer rear brake/taillight. Some markets or specific assemblies may use 3156 as an alternative.
Because some regions or trims may differ, inspect the bulb directly if you’re unsure.
Center high-mounted stop lamp (CHMSL)
The center high‑mounted brake lamp is often an LED unit on many 2016 Optima models. If your CHMSL uses a replaceable bulb, it is typically a small wedge-type bulb such as a T10/194, varying by trim.
- Common bulb-based CHMSL alternative (if applicable): T10/194 wedge style bulb, depending on trim.
LED CHMSLs do not require a replaceable bulb in many builds; when in doubt, check the owner’s manual or inspect the CHMSL housing.
How to verify the exact bulb size in your Optima
Because bulb sizes can vary by trim and market, use these steps to confirm the precise size for your vehicle before purchasing replacements.
- Park the car, engage the parking brake, and ensure the ignition is off. If you're handling electrical components near wiring, disconnect the negative battery terminal for safety.
- Open the trunk and locate the rear light assemblies. Remove any covers or access panels to reach the bulb socket.
- Remove the bulb socket by twisting/pulling as needed, then take out the bulb and read the size stamped on the base or compare it to standard sizes (e.g., 3157, 3156, etc.).
- If the CHMSL appears to be LED, consult the manual or dealer for replacement procedures, as bulbs may not be user-replaceable.
- Cross-check the part number with an auto parts retailer or Kia dealer to confirm compatibility for your exact VIN and trim.
After identifying the correct bulb, handle replacements with gloves to avoid oil residues, reassemble in reverse order, and test all lights to ensure proper operation.
Where to buy replacement bulbs
Reliable sources include authorized Kia parts departments, reputable auto parts stores, and trusted online retailers. Always verify compatibility with your Optima’s trim and region.
- Kia dealership parts department or official Kia parts retailer
- Auto parts chains and retailers (e.g., AutoZone, Advance Auto Parts, O'Reilly)
- Online retailers with vehicle compatibility checks (e.g., RockAuto, CarParts.com, Amazon)
Have your vehicle’s year, make, model, trim, and, if possible, the current bulb part number handy to ensure an exact match.
Summary
For a 2016 Kia Optima, expect the outer rear brake/taillights to use a 3157 dual-filament bulb, with the CHMSL often being LED; if bulb-based, the CHMSL may use a small wedge bulb such as a T10/194 depending on trim. Always verify by inspecting the bulb base or consulting the owner's manual, and purchase from reputable sources. If in doubt, contact a Kia dealer or parts retailer to confirm the exact size for your vehicle.