Bosch P3740WS Cabin Air Filter

Bosch Cabin Filter P3740WS for Audi and Volkswagen

Bosch P3740WS is an OEM-standard particulate cabin air filter built for Audi and Volkswagen applications that call for clean interior airflow. It uses layered filter media to capture dirt and environmental particles before they enter the passenger compartment.

Key Features

• Particulate cabin air filter for HVAC filtration
• Multiple layers of protection to trap airborne debris
• Captures up to 80% of dirt and environmental particles
• Filter media combines spunbound polyester and synthetic meltblow fibers
• OEM standard part for direct replacement service
• Recommended replacement interval: 12,000 miles
• Previously cataloged as Bosch P3740

Product Details

The Bosch Cabin Filter line focuses on passenger-cabin air quality with a particulate design that helps reduce the amount of dust and outside contaminants entering the HVAC system. Bosch P3740WS is built with foam-based construction and layered media for consistent filtration performance in everyday driving. This part number, P3740WS, is used in Audi A4, Audi A4 Quattro, Audi S4, Audi Cabriolet, Audi 90, Audi 90 Quattro, and Volkswagen Passat applications listed below.

This part cross-references 8A0819439 and 8A0819439A for the same application.

Vehicle Fitment

• Fits 2000-2002 Audi S4, N/A, Cabin Filter
• Fits 1996-2001 Audi A4, N/A, Cabin Filter
• Fits 1996-2001 Audi A4 Quattro, N/A, Cabin Filter
• Fits 2001 Volkswagen Passat, N/A, To Chassis # 3B-1-049 999; Cabin Filter
• Fits 1998-2000 Volkswagen Passat, N/A, Cabin Filter
• Fits 1994-1998 Audi Cabriolet, N/A, Cabin Filter
• Fits 1993-1995 Audi 90, N/A, Cabin Filter
• Fits 1993-1995 Audi 90 Quattro, N/A, Cabin Filter

What It Helps Address

• Dust entering the cabin through the HVAC system
• Road debris and environmental particles circulating in the interior air
• Reduced cabin air cleanliness during normal driving
• Restricted airflow caused by a loaded cabin filter
• Odor-related filtration needs where particulate capture is the priority

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. Confirm the vehicle application by model year and, for the 2001 Volkswagen Passat, verify the chassis note before ordering. Bosch P3740WS is a direct cabin filter service part for Audi A4, Audi A4 Quattro, and related fitments listed here.

Quality Assurance

Bosch designs this cabin filter as an OEM-standard replacement using layered particulate media for consistent filtration in the passenger compartment. The Bosch Cabin Filter line is built to meet routine service needs for Audi and Volkswagen HVAC systems.