What oil filter your 2004 Accord uses and where it sits

The 2004 Honda Accord uses a spin-on oil filter — the cylindrical cartridge that screws onto the engine block. On your Accord, it's located on the front of the engine, below and slightly to the right of the valve cover when you're looking at the engine from the front of the car. You'll see it jutting out from the block at roughly a 45-degree angle.

The correct filter part number depends on your engine. If you have the 2.0-liter four-cylinder (the base engine), Honda part number 15400-PLM-A01 or 15400-PLM-A02 is the original equipment filter. If you have the 2.4-liter four-cylinder (the more common engine in 2004), you need 15400-RTA-004 or 15400-RTA-003. Both are widely available at auto parts stores, and aftermarket equivalents from Fram, Mobil 1, and Bosch work just as well if they're rated for your engine size.

The filter capacity on both engines is roughly 3.7 quarts of oil total, though you'll only change about 3 quarts when you do the filter and drain plug together. Always check your owner's manual or the parts store label to confirm the exact part for your specific engine — using the wrong filter can restrict oil flow or cause leaks.

Key Takeaways

  • The 2004 Accord's oil filter is a spin-on cartridge located on the front of the engine block, accessible from above without removing other parts.
  • A 2.0-liter engine uses Honda part 15400-PLM-A01 or A02; a 2.4-liter uses 15400-RTA-004 or RTA-003, and you must match your engine size.
  • The filter should be replaced every time you change the oil, typically every 3,000 to 5,000 miles depending on your driving and oil type.
  • A clogged or failing filter reduces oil pressure, starves the engine of lubrication, and can cause bearing wear or engine seizure if ignored.

Why the oil filter matters to your engine's survival

Your oil filter removes metal particles, dirt, and combustion byproducts from the oil before it circulates through the engine. Over time, the filter media (the pleated paper inside) becomes saturated and restricts flow. When that happens, the engine's oil pressure drops, and the bearings, pistons, and valve train don't get the film of oil they need to survive.

A clogged filter forces the engine to work harder to push oil through, which heats the oil and accelerates its breakdown. In extreme cases, the oil pressure warning light comes on, or the engine begins to knock and ping under load — both signs that lubrication is failing. Ignored long enough, this leads to bearing wear, scored cylinder walls, and eventually engine seizure. A $15 filter replaced on schedule prevents a $3,000 engine rebuild.

How to locate and access the filter on your Accord

Open the hood and look at the front of the engine. The filter is the black or silver cylinder about 4 inches tall, mounted vertically or at an angle on the driver's side of the engine block. On a 2004 Accord, it's usually positioned low enough that you can reach it from above without removing the wheel or bumper, though you may need to move the air intake tube slightly to get your hand in comfortably.

If you're working in a tight space, you can access it from underneath as well — jack the car safely on jack stands, remove the plastic undertray if present, and you'll have a clearer angle. The filter sits close to the subframe, so make sure the engine is cool before you touch it. A fresh filter gets hot during operation and will burn your hand if you grab it right after driving.

Removing the old filter and installing the new one

Place a drain pan underneath the filter to catch the oil that will spill out. Use an oil filter wrench — a socket-style wrench that grips the filter's outer diameter — and turn it counterclockwise to loosen. Once it's loose enough, unscrew it by hand, being careful not to tip the pan of old oil. The filter will be heavy and full of used oil, so let it drain into the pan for a few seconds before setting it aside.

Wipe the filter mounting surface on the engine block with a clean rag to remove any dirt or old rubber gasket material. This step matters: a dirty sealing surface can cause the new filter to leak. Take the new filter and explore a thin coat of fresh oil to the rubber gasket on the top of the filter — this helps it seal properly and makes removal easier next time. Screw the new filter on by hand until the gasket contacts the block, then tighten it another three-quarters of a turn. Do not use the wrench to tighten; hand-tight is correct. Over-tightening crushes the gasket and causes leaks.

Checking oil level and pressure after the filter change

After you've installed the new filter, add the correct amount of fresh oil back into the engine through the oil filler cap on top of the valve cover. For a 2004 Accord, that's typically 3.7 quarts total, but you'll add roughly 3 quarts if you're doing the filter and drain plug together. Use the grade specified in your owner's manual — most 2004 Accords call for 0W-20 or 10W-30 depending on climate and engine size.

Start the engine and let it idle for 30 seconds to circulate the new oil through the filter. The oil pressure warning light should come on briefly, then turn off within a few seconds as oil pressure builds. If the light stays on, turn off the engine when ready and check your oil level — you may have underfilled. Once the light goes out and the engine runs smoothly, turn it off, wait two minutes, and check the dipstick to confirm the level is at the full mark.

How often to replace the filter and what affects the schedule

Honda recommends replacing the oil filter every time you change the oil. For a 2004 Accord, that interval depends on your driving conditions and oil type. If you use conventional mineral oil, change the filter every 3,000 to 5,000 miles. If you use synthetic oil, the interval extends to 7,500 to 10,000 miles, though some synthetics allow up to 15,000 miles — check the oil bottle and your owner's manual.

Severe driving — frequent short trips, towing, idling in traffic, or dusty conditions — shortens the interval. If you drive mostly on the highway at steady speeds, you can stretch it toward the longer end. The filter itself doesn't wear out faster in one condition than another, but the oil degrades faster under stress, and a clogged filter is more likely if you're running old oil. Replacing the filter on schedule keeps oil pressure stable and prevents the engine from working harder than it needs to.

Signs your filter is failing or clogged

A failing oil filter usually announces itself through the oil pressure warning light on your dashboard — a small red oil can symbol that glows when pressure drops below safe levels. This light comes on when the filter is so clogged that oil can barely flow through it, or when the filter's internal bypass valve opens because it can't push oil through the media anymore. If you see this light, stop driving when ready and check your oil level first; if the level is full, the filter is likely the problem.

Other signs include a burning smell from the engine (caused by oil starvation and friction), a metallic ticking or knocking sound under acceleration (bearing wear from poor lubrication), or visible oil leaks around the filter housing. A filter that leaks oil will show a wet ring around the base where it mounts to the block. None of these conditions improve on their own — they worsen quickly and damage the engine if ignored.

Frequently Asked Questions

Can I use any oil filter on my 2004 Accord, or does it have to be Honda?

You don't need a Honda filter, but you must use one rated for your engine size and oil type. Fram, Mobil 1, Bosch, and other major brands make filters that fit and work just as well. The key is matching the part number to your 2.0 or 2.4-liter engine. Avoid very cheap filters with thin media — they clog faster and offer less protection.

What happens if I don't replace the filter when I change the oil?

The old filter continues to trap contaminants, but its media becomes saturated and restricts flow. Within a few hundred miles, oil pressure drops and the engine runs with inadequate lubrication. Bearings wear faster, and you risk engine damage. Always replace the filter with the oil.

How tight should I screw the new filter on?

Hand-tight plus three-quarters of a turn is correct. The rubber gasket seals when it contacts the block; over-tightening crushes it and causes leaks. Use a wrench only to remove the old filter, never to tighten the new one.

Can I change just the filter without changing the oil?

Technically yes, but it defeats the purpose. The filter traps particles, but the oil itself degrades over time and loses its ability to protect. Changing the filter without the oil means you're running old, worn-out oil through a new filter. Change them together on your regular schedule.

What should I do with the old filter after I remove it?

Take it to an auto parts store or recycling center — most accept used filters for free. The filter contains used oil and should not go in the trash. Some stores will take it if you buy the new filter there.