Verified Technical Specs
2015 Mercedes-Benz C-Class Cabin & Engine Air Filter Sizes, OEM Part Numbers & DIY Location Guide
Generation W205 (2015 to 2021) • Fast DIY Installation Guide
CF11933
Cabin Filter (Fram)
CA11475
Engine Filter (Fram)
10.2" × 7.6"
Cabin Dimensions
10 to 15 mins total
DIY Time
Quick Answer: The database lists a cabin filter measuring 10.2 × 7.6 × 1.5 inches, with OEM reference 1668300218 and Fram reference CF11933, for the 2015 Mercedes-Benz C-Class. The listed engine filter measures 11 × 6.8 × 1.7 inches, with OEM reference 2760940004 and Fram reference CA11475. Confirm the generation, engine, trim, and existing filter number before ordering.
Listed Filter Part Numbers and Reference Dimensions
Cabin Air Filter (Passenger HVAC)
Air conditioning & heating breathing air
OEM Part Number
1668300218
Fram Fresh Breeze
CF11933
Wix Premium Filter
WP10180
Dimensions (Inches)
10.2" × 7.6" × 1.5"
Dimensions (Metric)
259 × 193 × 38 mm
Airflow Direction Record
Points upward into air conditioning evaporator box
Location Reference
Under passenger dashboard footwell (combination filter)
Engine Air Intake Filter
Combustion chamber intake protection
OEM Part Number
2760940004
Fram Extra Guard
CA11475
Wix Heavy Duty
49120
Dimensions (Inches)
11" × 6.8" × 1.7"
Dimensions (Metric)
279 × 173 × 43 mm
Airbox Fasteners
Torx T25 screws (V6/V8 models use 2 air filters)
Engine Bay Location
Dual intake airboxes over cylinder heads
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2015 Mercedes-Benz C-Class Cabin Air Filter Direction
Vehicle record: Points upward into air conditioning evaporator box
Confirm the marking on the replacement filter and housing. An Air Flow arrow shows the direction air travels through the media. A This Side Up marking shows physical orientation. Do not apply a universal up-or-down rule to every vehicle.
How to Replace the 2015 Mercedes-Benz C-Class Cabin Air Filter
Location reference: Under passenger dashboard footwell (combination filter). Access design varies by vehicle, so use the owner manual or a model-specific service procedure before removing trim or opening the ventilation housing.
1
Confirm the Filter and Access Location
Match the year, generation, trim, and cabin filter part number. Confirm the listed housing location before starting.
2
Record the Existing Orientation
Photograph or note the old filter marking and housing label before removal. Check whether the label says Air Flow or This Side Up.
3
Open the Access Cover Correctly
Follow the vehicle-specific procedure for clips, screws, glove box components, or cowl panels. Do not force an access cover that remains attached.
4
Remove the Old Filter and Control Debris
Pull the old filter out slowly. Keep loose leaves and dust from falling deeper into the ventilation housing.
5
Install, Close, and Test
Compare the new frame with the old filter, follow the confirmed marking, seat the filter evenly, close the access cover, and test ventilation airflow.
How to Replace the 2015 Mercedes-Benz C-Class Engine Air Filter
The engine air filter is listed in the dual intake airboxes over cylinder heads. The housing uses Torx T25 screws (V6/V8 models use 2 air filters). Confirm the vehicle-specific procedure, keep loose debris out of the clean side of the airbox, seat the new filter evenly, and secure every fastener.
Avoid pulling on sensor wiring or intake hoses. Disconnect a sensor only when the service procedure requires it, and do not touch the sensing element.
2015 Mercedes-Benz C-Class Air Filter Replacement Cost Factors
Replacement cost depends on the selected filter, part brand, local labor rate, and access difficulty. Confirm the exact part number before comparing prices.
For a useful comparison, request a written service quote that separates parts and labor, then compare it with the price of the same part number or an equivalent verified replacement.
Frequently Asked Questions About 2015 Mercedes-Benz C-Class Air Filter Maintenance
What direction should the airflow arrow point on a 2015 Mercedes-Benz C-Class cabin air filter?
The vehicle record lists the cabin filter direction as Points upward into air conditioning evaporator box. Confirm the marking on the filter and housing. An Air Flow arrow shows airflow direction, while a This Side Up marking shows physical orientation.
Where is the cabin air filter located on the 2015 Mercedes-Benz C-Class?
The vehicle record lists the cabin air filter location as Under passenger dashboard footwell (combination filter). Access panels, fasteners, and removal steps can vary, so check the owner manual or a vehicle-specific service procedure before removing trim.
Can a dirty engine air filter trigger the check engine light on a 2015 Mercedes-Benz C-Class?
A restricted or incorrectly fitted filter is one possible intake issue, but a warning light can have many causes. Read the diagnostic codes and test the relevant system before replacing parts.
How often should I replace the cabin and engine air filters on my 2015 Mercedes-Benz C-Class?
Follow the maintenance schedule in the 2015 Mercedes-Benz C-Class owner manual. Timing depends on mileage, time, filter type, and driving environment. Inspect sooner in dusty, smoky, or debris-heavy conditions.
How much does it cost to replace the air filters on a 2015 Mercedes-Benz C-Class at a dealership vs DIY?
Cost depends on the selected filter, local labor rate, and access difficulty. Confirm the exact part number, then compare the part price with a written service quote that separates parts and labor.
Why does my car blower motor vibrate or buzz loudly after changing the cabin air filter?
Loose debris in the blower housing is one possible cause, but the filter, access cover, fan, and other ventilation components can also create noise. Stop using the fan if severe vibration starts and inspect the housing or seek qualified diagnosis.
What is the difference between standard paper, activated carbon, and HEPA cabin filters?
Standard particulate media targets airborne debris. Activated-carbon products add an adsorbent layer for some odors and gases. Products marketed as HEPA or high efficiency should be compared using the manufacturer rating and verified vehicle fitment.
Will an aftermarket oiled air filter void my vehicle warranty or damage my engine?
Warranty coverage and product suitability depend on the vehicle, filter, installation, and applicable warranty terms. Follow the filter service instructions and avoid over-oiling a serviceable filter.
What are the exact dimensions of the 2015 Mercedes-Benz C-Class air filters?
The database lists the cabin filter at 10.2 inches long by 7.6 inches wide by 1.5 inches thick. The listed engine filter is 11 inches long by 6.8 inches wide by 1.7 inches thick. Confirm the part number and physical fit before ordering.
What tools do I need to replace the air filters on a 2015 Mercedes-Benz C-Class?
Tool requirements depend on the access design. Check the cabin filter procedure before removing panels. The engine airbox record lists Torx T25 screws (V6/V8 models use 2 air filters); confirm the procedure and tool size before opening the housing.
Complete 2015 Mercedes-Benz C-Class Maintenance Specifications & Fluid Capacities: