There isn’t a single universal size for all 2019 Optima models—the engine air filter size and the cabin air filter size depend on the engine option and trim. The best way to know the exact measurements is to check the owner’s manual or look up the OEM part numbers using your VIN.
Engine air filter: what to know
The engine air filter sits in the air intake box under the hood. For the 2019 Optima, sizes vary by engine option, so there isn’t a one-size-fits-all measurement across trims. The most reliable way to confirm is to check the current filter itself or consult Kia’s parts catalog for your VIN.
To identify the correct engine air filter size, follow these steps:
- Inspect the current filter: remove it from the air box and note its dimensions (length, width, and thickness) and any part numbers printed on the filter frame.
- Check the vehicle’s documentation or a VIN-based parts lookup to confirm the exact size and replacement part number for your specific configuration (engine type and trim).
- Ensure the replacement matches the OEM part number or the measured dimensions if you are using an aftermarket option.
In short, engine air filter size is engine-dependent and must be matched to your Optima’s specific configuration.
Cabin air filter: what to know
The cabin filter protects the HVAC system and the interior air. Like the engine filter, cabin filter size varies with trim and HVAC setup, so it’s essential to verify the exact part number for your VIN. Cabin filters for many newer Kia models tend to fall in a common rectangular size range, but exact dimensions can differ between configurations.
To identify the correct cabin filter size, use these steps:
- Access the cabin filter by removing the cabin filter cover (usually behind the glove box or under the dashboard) and note any size markings on the filter frame.
- Measure the filter’s height, width, and depth or record the printed part number.
- Use a VIN-based parts lookup (Kia’s official site, a dealership, or a trusted retailer) to confirm the precise cabin filter size for your Optima.
In short, cabin filter size is vehicle-specific and should be confirmed by part number or measurement before purchasing.
Where to buy and replacement tips
When buying either filter, choose OEM (factory) or certified aftermarket options that clearly state compatibility with the 2019 Kia Optima and your engine variant. If you are unsure about the exact size, provide your VIN to the retailer or consult the dealership to ensure you receive the correct filter for your configuration.
Replacement tips in brief: maintain a regular replacement schedule, keep a spare on hand for routine maintenance, and always inspect the seal and mounting area during installation to ensure a proper fit and optimal filtration.
Summary
The 2019 Kia Optima uses two primary filters—engine and cabin—with sizes that vary by engine option and HVAC configuration. To guarantee an exact fit, verify either the OEM part numbers for your VIN or measure the existing filters. Consulting the owner’s manual, using a VIN-based parts lookup, or asking a Kia dealer are reliable ways to secure the correct sizes. Regular replacement helps maintain engine efficiency and interior air quality.