What Engine Air Filter Fits a 2021 Ford F-150?
Engine air filter part numbers catalogued for the 2021 Ford F-150 (3.5 L petrol, 6-cyl, 370 hp), the engine variants that change them, and how to replace it.
For the 2021 Ford F-150 with the 3.5 L petrol, 6-cyl, 370 hp engine, the parts catalogue lists K&N Filters 33-2385 as an air filter. The 2021 F-150 was built with 8 engine variants (from 3.5 L to 6.2 L); this part number is catalogued for the 3.5 L petrol, and other engines can take a different air filter. Ford’s maintenance schedule for the 2021 F-150 lists the engine air filter every 5,000 mi.
Last updated: · Source: aftermarket parts catalogue
2021 Ford F-150 engine air filter: key facts
| Catalogued engine | 3.5 L petrol, 6-cyl, 370 hp |
|---|---|
| Part numbers | 33-2385 (K&N Filters) |
| Catalogue listings | 1 air filter, 1 brand |
| Engine variants (2021) | 8, from 3.5 L to 6.2 L |
| Fit is decided by | The engine and the shape and dimensions of the airbox |
| Manufacturer interval | Every 5,000 mi (Ford) |
| NHTSA recalls: engine | 1 of 29 for this model |
| DIY | Very easy DIY (5–10 minutes, no tools) |
Sources: aftermarket parts catalogue (part numbers, engines), manufacturer maintenance schedule, NHTSA recalls.
Engine Air Filter: what it does & when to replace it
The engine air filter keeps dust, pollen, and debris out of the intake so only clean air reaches the combustion chamber. A clogged filter restricts airflow, which can reduce fuel economy and acceleration. Most are replaced every 20,000–30,000 km, sooner in dusty conditions. A quick check: hold it up to light — if little passes through, replace it. This is one of the simplest maintenance tasks; the filter usually sits in an airbox under a few clips with no tools required, making it a true beginner DIY job.
DIY difficulty: Very easy DIY (5–10 minutes, no tools). Always confirm the correct part for your exact build by VIN before buying.
Which engine does your 2021 Ford F-150 have?
The 2021 Ford F-150 was sold with 8 engine variants, and the correct engine air filter can differ between them. This is the single thing a year/make/model dropdown cannot tell you.
| Engine | Fuel | Cylinders | Years |
|---|---|---|---|
| 5.4 L 313 hp | Petrol | 8 | 2008–now |
| 4.2 L 213 hp | Petrol | 6 | 2007–now |
| 5.4 L 300 hp | Petrol | 8 | 2007–now |
| 3.5 L 370 hp | Petrol | 6 | 2011–now |
| 6.2 L 416 hp | Petrol | 8 | 2010–now |
| 5.0 L 367 hp | Petrol/Ethanol | 8 | 2011–now |
| 4.6 L 295 hp | Petrol | 8 | 2008–now |
| 5.0 L 367 hp | Petrol | 8 | 2011–now |
Engine variants catalogued for this model (parts catalogue), filtered to those built around 2021. We hold catalogued part numbers for the base engine only — decode your VIN and we resolve your exact engine, then the exact part. Full dimensions and specifications for this vehicle are on the 2021 Ford F-150 overview.
How to replace the engine air filter on a 2021 Ford F-150
- 1Locate the airbox — a large plastic housing connected to the intake duct.
- 2Release the clips or screws holding the airbox lid and open it.
- 3Lift out the old filter, noting its orientation (which way is up/airflow).
- 4Wipe out any debris from the housing, then seat the new filter the same way the old one sat.
- 5Close and re-secure the lid. No tools or calibration needed.
⚠ Fit the filter in the correct orientation so it seals fully.
These are general steps for the engine category. Exact fastener locations, torque values, and the correct part number depend on your 2021 Ford F-150’s build — confirm by VIN before you start.
Compatible parts for your 2021 Ford F-150
Real engine air filter options catalogued for this 2021 Ford F-150 (parts catalogue), shown for the base engine (3.5000 L Petrol). Each links to live marketplace listings for that exact brand and part number.
| Brand | Part number | Note | Shop |
|---|---|---|---|
| K&N Filters | 33-2385⇆ cross-ref |
Air Filter | Find this part → |
Compatible options shown for the base engine — exact fit can vary by engine and trim; confirm with your VIN before buying. Part data: aftermarket parts catalogue.
Shop engine air filter for your 2021 Ford F-150
Browse engine air filter listings from major marketplaces. Confirm fitment by VIN first — use VinSnap above to get the exact part number for your build before purchasing.
Find the exact engine air filter by VIN
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Decode my VIN →Frequently asked questions
What engine air filter fits a 2021 Ford F-150?
For the 2021 Ford F-150 with the 3.5 L petrol, 6-cyl, 370 hp engine, the parts catalogue lists K&N Filters 33-2385 as an air filter. The 2021 F-150 was built with 8 engine variants (from 3.5 L to 6.2 L); this part number is catalogued for the 3.5 L petrol, and other engines can take a different air filter.
How often should the engine air filter on a 2021 Ford F-150 be replaced?
Ford’s maintenance schedule for the 2021 F-150 lists the engine air filter every 5,000 mi. The engine air filter keeps dust, pollen, and debris out of the intake so only clean air reaches the combustion chamber. A clogged filter restricts airflow, which can reduce fuel economy and acceleration.
Can I replace the engine air filter on a 2021 Ford F-150 myself?
Very easy DIY (5–10 minutes, no tools). Allow about 5–10 minutes. Tools: usually none, screwdriver (some airboxes). Fit the filter in the correct orientation so it seals fully.
Are there recalls on the 2021 Ford F-150’s engine?
Yes. NHTSA lists 1 recall for the 2021 Ford F-150 filed under the engine: 24V635000 (2024-08-23), engine and engine cooling / engine / hard parts internal/mechanical. Recall repairs are free at a franchised Ford dealer.