The Mercedes-Benz C-Class air filter is one of the easiest maintenance items any US owner can tackle — and one of the most overpriced at dealerships. Mercedes dealers in the US charge $80–$150 for a job that takes less than 15 minutes and costs $20–$35 in parts from Amazon. Here's everything you need to know.
Which C-Class Do You Have?
- W204 (2007–2014): C250, C300, C350. The 1.8L turbo 4-cylinder (271 engine) and 3.5L V6 (272 engine) both use accessible air filter boxes.
- W205 (2015–2023): C300, C43 AMG. The 2.0L 4-cylinder (M274) and the 3.0L V6 AMG use different filter sizes.
Always check your build sticker in the driver's door jamb or use your VIN on a parts site to confirm the exact filter.
What You'll Need
This job requires zero specialty tools. If you can open a Tupperware container, you can replace a Mercedes air filter.
Best Air Filters for US Mercedes C-Class Owners
Mercedes C-Class Air Filters on Amazon USA
Step-by-Step: W204 (2007–2014)
1. Open the Hood
The hood release is on the left side of the dash, below the steering wheel. Pull the lever, then lift the safety catch at the front of the hood.
2. Locate the Airbox
On the W204 4-cylinder, the black plastic airbox is on the driver's side (left side of the engine bay). On the V6, it's toward the center-left.
3. Release the Housing Clips
The airbox lid is held by 4 spring-loaded metal clips. Slide each clip outward with your fingers or a flathead screwdriver. The lid will lift off.
4. Remove Old Filter
Note the filter's orientation (there's usually a rubber seal lip on one side). Lift out the old filter and inspect it. If it's gray or black, definitely due for replacement. Yellow-to-light-tan is getting close. A new filter is bright white.
5. Wipe the Airbox
Use a microfiber towel to wipe out any leaves, insect debris, or dust from inside the airbox. On cars with many miles, a compressed air blast into the intake tube is helpful.
6. Install New Filter
Drop in the new filter, rubber-seal-lip first, seated in the groove around the airbox perimeter. It should sit flat with no gaps.
7. Reinstall the Lid
Lower the lid and snap all four clips back. Done.
Step-by-Step: W205 (2015–2023)
The W205 process is nearly identical, but the airbox is slightly more recessed. On the 2.0L M274 engine, the airbox is on the passenger side. Release 4 push-pin clips (not spring clips), lift the lid, swap the filter, reinstall.
On the C43 AMG (3.0L V6 Biturbo), there are two separate airboxes — one per bank. Replace both filters at the same service interval.
How Often to Change the Filter?
Mercedes recommends every 30,000–40,000 miles, but US roads (especially in dusty states like Arizona, Texas, New Mexico, and Nevada) can clog filters faster. Check annually. If you drive unpaved roads frequently, inspect every 10,000 miles.
Will a K&N Filter Trigger a CEL?
K&N reusable filters are popular in the US. However, over-oiling a K&N filter can contaminate the mass airflow (MAF) sensor and trigger a check engine light. If you use a reusable filter, use very light oil when re-oiling and let it dry completely before reinstalling.
Total Cost
Dealer charge: $80–$150. DIY with a quality filter from Amazon: $16–$25. Time required: 15 minutes. This is the highest ROI maintenance item on your C-Class.