Bosch C3804WS Cabin Air Filter

Bosch Cabin Filter C3804WS Overview

The Bosch C3804WS cabin air filter is a charcoal cabin filter built for vehicles that need cleaner interior air and odor control from the HVAC system. Its 5-layer design adds activated carbon and an extra cover layer to help reduce exhaust-related gases and unwanted smells entering the cabin.

Compatible With select BMW 745i, 745Li, 750i, 750Li, 760i, 760Li and Rolls-Royce Phantom applications, this Bosch Cabin Filter, Activated Carbon is an OE-standard replacement for factory-style HVAC filtration. The Bosch C3804WS is also cataloged as C3804.

Key Features

• Activated charcoal filter media for cabin air filtration
• 5-layer construction with an added carbon layer for odor reduction
• Extra cover layer for added protection in the HVAC intake path
• OE standard part design for factory-style fitment
• Recommended replacement interval: 12,000 miles
• Fits BMW and Rolls-Royce applications listed below

Product Details

Bosch Cabin Filter, Activated Carbon products are designed to address common cabin air concerns by filtering incoming air through multiple layers of media. On the C3804WS, the activated charcoal layer helps absorb ozone, nitrogen oxide, sulfur dioxide, and hydrocarbons that can contribute to stale or harsh cabin odors. This makes the filter a practical choice for drivers seeking a direct replacement for the HVAC filter used in BMW 745i, BMW 745Li, BMW 750i, BMW 750Li, BMW 760i, BMW 760Li, and Rolls-Royce Phantom models.

This part cross-references BMW 64119272643 for the same application.

What It Helps Address

• Unwanted odors entering the cabin through the HVAC system
• Reduced filtration performance from a dirty or saturated cabin filter
• Dust and airborne debris passing through the climate control intake
• Factory-style replacement needs for BMW and Rolls-Royce cabin filtration
• Maintenance intervals tied to cabin air quality and airflow

Installation Notes and Tips

Replace the cabin filter according to the vehicle maintenance schedule or around the 12,000-mile interval listed by Bosch. Verify the filter dimensions and vehicle application before installation, and inspect the HVAC housing for debris before installing the new filter. For best results, install the filter in the correct airflow direction if the vehicle housing indicates one.

Quality Assurance

Bosch manufactures this cabin air filter as an OE-standard replacement part with a charcoal media design and multi-layer construction. It is built to match the listed applications for consistent HVAC filtration performance.