Bosch P3743WS Cabin Air Filter

Bosch Cabin Filter for Mercedes-Benz

Bosch P3743WS is a particulate cabin air filter built for Mercedes-Benz HVAC systems that use a fresh air cabin filter design. It uses layered filter media to capture airborne dirt and environmental particles before they enter the passenger compartment, helping maintain cleaner air inside the vehicle.

Compatible with select Mercedes-Benz CLS550, CLS63 AMG, E320, E350, E550, E63 AMG, E280, CLS500, CLS55 AMG, E500, and E55 AMG applications, this Bosch Cabin Filter supports routine cabin air service for models across the 2003-2011 range. The Bosch Cabin Filter line focuses on OE-standard fit and filtration performance for everyday maintenance.

Key Features

• Particulate cabin air filter for HVAC filtration
• Multi-layer media made from spunbound polyester and synthetic meltblow fibers
• Captures up to 80% of dirt and environmental particles entering the cabin
• OE standard part for factory-style replacement
• Non-carbon, non-HEPA design for straightforward particulate filtration
• Recommended replacement interval: 12,000 miles
• Previously cataloged as Bosch P3743

Detailed Description

Bosch P3743WS is engineered as a particulate cabin filter for Mercedes-Benz vehicles that rely on fresh air cabin filtration. The filter media combines spunbound polyester with synthetic meltblow fibers to create multiple layers of protection against dust and other airborne contaminants. For drivers searching for a Mercedes-Benz E320 cabin air filter, Mercedes-Benz E350 cabin filter, or Bosch P3743WS replacement, this part provides an OE-standard service option.

This part cross-references Mercedes-Benz 2118300018 for the same application. It is a direct-fit style maintenance part for select Mercedes-Benz CLS and E-Class models, including 2003-2009 E320, 2006-2009 E350, 2007-2009 E550, and 2007-2011 CLS550 applications.

What It Helps Address

• Dust entering the cabin through the HVAC intake
• Road debris and airborne particles circulating through the ventilation system
• Reduced cabin air cleanliness during normal driving
• Routine maintenance needs for Mercedes-Benz fresh air cabin filter service
• Filter restriction from extended service intervals

Installation Notes and Tips

Replace the cabin filter at the recommended 12,000-mile interval or sooner if airflow drops or the filter is visibly loaded with debris. Verify the vehicle’s cabin filter location and match the application to the exact Mercedes-Benz model and year before installation. This filter is intended for vehicles listed in the fitment data and should be installed as part of regular HVAC maintenance.

Quality Assurance

Bosch cabin filters are built to OE-standard specifications for fit and filtration consistency. The Bosch Cabin Filter line is designed for dependable passenger-compartment air filtration in routine service applications.