Bosch P3954WS Workshop Particulate Cabin Air Filter

The Bosch P3954WS Workshop Cabin Air Filter is a high-performance particulate filter engineered to deliver cleaner, fresher air to your vehicle's interior. This direct-replacement filter features advanced multi-layer filtration technology that captures up to 80% of dirt, dust, pollen, and other environmental contaminants at 3 microns or greater, protecting passengers from harmful airborne particles.

Advanced Three-Layer Filtration System:

• Layer 1: Non-woven pre-filter layer captures larger particles and debris
• Layer 2: Electrostatically charged microfiber layer attracts and traps smaller, elusive particles
• Layer 3: Non-woven cover layer provides structural stability and acts as an additional barrier against harmful elements

Key Features:

• High pleat count design provides greater surface area for superior filtration capacity
• Polyester filter media for durability and performance
• Foam perimeter gasket (where specified by OE) prevents unfiltered air from bypassing the filter
• Designed and tested to meet HEPA standards based on ASTM D2986 test protocol
• Direct OE replacement for easy installation
• 12-month manufacturer warranty

Bosch recommends inspecting cabin air filters at least once a year and following manufacturer-specified replacement intervals. Signs that replacement may be needed include reduced airflow through the HVAC system or unusual fan noise. This filter replaces Mazda OEM part numbers KD4561J6X and TK4861J6X.