The answer in brief: the 2018 Honda Accord uses two filters—an engine air filter in the intake and a separate cabin air filter for the HVAC system. The exact engine filter part number depends on which engine you have (1.5-liter turbo or 2.0-liter turbo), but both are standard engine and cabin air filters used in modern Hondas.
Engine air filter
The engine air filter sits in the engine bay inside the air intake box and is a rectangular paper element designed to keep dust and debris from reaching the engine. Replacement intervals vary with driving conditions, typically around 30,000 to 45,000 miles, or sooner in dusty environments. To ensure you order the correct filter, you’ll need to confirm which engine your car has and check the parts catalog via VIN or your owner’s manual.
To help you locate the correct engine air filter, consider these factors:
- Engine variant: 1.5L turbo vs 2.0L turbo. The two engines use different filter part numbers and sometimes slightly different box fits.
- Air box fitment: The filter is a rectangular element that sits inside the OEM air box under the engine cover; ensure the dimensions match your box.
- Replacement interval: Conditions such as dust, mileage, and driving environment can shorten the service interval.
Keeping these factors in mind will help you order the right filter and avoid fitment issues.
Replacing the engine air filter
Below are the steps to replace the engine air filter:
- Park the car on a level surface and turn off the engine; open the hood and locate the engine air box, usually on the passenger side of the engine bay.
- Unclip or release the latches on the air box lid and remove it to expose the filter.
- Take out the old filter and inspect the inside of the box for debris or moisture; wipe as needed.
- Place the new filter into the box with the correct orientation (the filter usually has an arrow indicating airflow); ensure it seats flat and the box is resealed.
- Reattach the air box lid and secure the latches; start the engine and listen for any hissing sounds indicating a loose seal.
Replacing the engine air filter at the recommended interval helps maintain performance and fuel efficiency.
Cabin air filter
The 2018 Accord also uses a cabin air filter to clean intake air for the HVAC system. The filter is typically located behind the glove box or under a panel near the dash, and it prevents dust, pollen, and other particles from entering the cabin. There are two common cabin filter options: standard filtration and activated charcoal for odor control. Availability can vary by trim and market, so verify the exact part when you buy.
To help you choose the right cabin filter type, consider these options:
- Standard cabin air filter for basic filtration of dust and allergens.
- Activated charcoal cabin filter for odor reduction and enhanced filtration.
- OEM vs aftermarket choices; OEM parts are usually cited for your specific trim and year.
Knowing whether you need charcoal filtration or a standard filter will help you select the correct product for your Accord.
Replacing the cabin air filter
Below are the steps to replace the cabin air filter:
- With the glove box lowered, locate the cabin air filter housing door; remove any cover or screws and take out the old filter.
- Inspect the housing for debris and wipe clean if needed.
- Install the new filter in the correct orientation (the airflow arrow on the filter should point into the cabin area); reseal the housing and reassemble the glove box.
- Run the HVAC on a light setting to verify proper airflow and that there are no unusual sounds indicating a loose filter.
Replacing the cabin air filter improves cabin air quality and HVAC efficiency.
Buying tips and care
When shopping for filters for a 2018 Honda Accord, you can choose OEM Honda parts or trusted aftermarket brands. To ensure a correct fit, have your Vehicle Identification Number (VIN) handy or confirm the engine option in your owner's manual. Common brands include OEM Honda, Bosch, Fram, K&N, Mann, and Wix. Always replace with the appropriate filter type intended for engine or cabin use.
- Engine filter should be labeled for engine air intake, not cabin air.
- Cabin filter should be labeled as cabin air or HVAC filter; consider an activated charcoal variant if you have odors from urban driving or pollen allergies.
- Check filter dimensions and box compatibility; if your box is an unusual shape, verify with the retailer.
For any replacement, follow the vehicle’s service schedule and consult a dealer or mechanic if you’re unsure about fitment or orientation.
Summary
In short, the 2018 Honda Accord uses two filters: an engine air filter in the intake and a separate cabin air filter for the HVAC system. The exact engine filter part number depends on whether you have the 1.5L turbo or the 2.0L turbo, and both filters can be sourced from OEM Honda or trusted aftermarket brands. Regular replacement at the recommended intervals helps maintain engine performance and cabin air quality.