The engine air filter is located in the air-filter housing in the engine bay, typically on the driver’s side; the oil filter sits on the engine block. On Civics, the air filter is the component most owners service and is the one usually referred to as the "engine filter."
Because the phrase "engine filter" can refer to more than one component, this guide covers the two most commonly encountered engine filters in Civics: the engine air filter and the engine oil filter. The air filter cleans incoming air before it reaches the combustion chamber, while the oil filter traps particulates in the engine oil. In some models, the cabin air filter or fuel filter is separate from the engine filter and located elsewhere. Access points vary by generation, so consult your owner’s manual for exact locations if you’re unsure.
Air filter location and replacement
Before you start, note that the following steps describe the general process for a typical Honda Civic; exact clips, screws, and fit may vary by year.
- Park on a level surface, engine off, and set parking brake. Open the hood and locate the large rectangular air-box on the engine bay, usually toward the driver’s side, connected to a sizeable intake hose.
- Unclip or remove the fasteners securing the air-box lid. Some models use metal clips; others use screws or bolts.
- Lift the lid and lift out the old air filter. Check the inside of the box for debris and wipe it clean if needed.
- Inspect the old filter for excessive dirt; replace it if it looks dirty or past its service interval.
- Install the new air filter with the correct orientation, aligning the edges and the airflow direction embossed on the filter. Most filters have an arrow showing the correct flow toward the throttle body.
- Re-seat the air-box lid and secure the clips or screws. Reconnect the intake hose if it was disconnected.
- Close the hood and start the engine to confirm it runs smoothly. This is also a good time to check for any abnormal sounds or leaks around the air box.
Keeping the air filter clean helps your Civic breathe easily and maintain performance and fuel efficiency.
Oil filter: location and replacement
Notes about access and pre-requisites for changing the oil. The oil filter is mounted on the engine block; some Civics require you to raise the car to access from underneath or to remove a shield.
- Warm the engine briefly, then park on level ground and turn it off. Place an oil drain pan beneath the oil pan.
- Remove the oil drain plug to drain the old oil; once drained, reinstall the drain plug.
- Locate and remove the old oil filter using an appropriate filter wrench; be prepared for residual oil to spill.
- Wipe the filter mounting surface clean, apply a thin coat of fresh oil to the gasket on the new filter, and thread the new filter by hand until snug. Do not overtighten.
- Refill with the recommended engine oil to the proper level. Reinstall the oil filler cap and run the engine briefly to check for leaks.
- Shutdown, recheck the oil level with the dipstick, and top off as needed. Dispose of used oil and the old filter properly.
Oil filters and the related oil change are essential for engine longevity; following proper steps helps prevent leaks and engine wear.
Summary
For most Honda Civics, the engine air filter sits in a rectangular air-filter housing in the engine bay on the driver’s side, while the engine oil filter is mounted on the engine block. The air filter is the component most people mean by “engine filter,” and it’s the part you’ll service most often. Always consult your specific model year’s manual for exact access points, orientation, and torque specs, and consider professional service if you’re unsure about performing the replacement yourself.