Hengst E4931LI Cabin Air Filter

HEZ Cabin Air Filter for Audi HVAC Systems

The Hengst HEZ Cabin Air Filter E4931LI is a particulate cabin air filter for Audi HVAC systems. It is built for drivers who need a direct-fit replacement for the cabin air filtration setup used across a wide range of Audi A4, A5, Q5, S4, S5, SQ5, RS5, and A7 Sportback applications.

Key Features

• Particulate filter media for cabin air filtration
• HEZ Cabin Air Filter product line
• Fits multiple Audi sedan, Sportback, allroad, and SUV applications
• Direct replacement for common OE and interchange references
• Supports pollen and dust filtration in the HVAC system

Product Details

Hengst E4931LI is a cabin air filter built around particulate media to help filter incoming air before it enters the passenger compartment. The HEZ Cabin Air Filter line is positioned for OE-style HVAC service on Audi platforms, including 2025 Audi A5 Quattro, 2024 Audi Q5 Sportback, 2023 Audi S5, and earlier applications back to 2017. This part cross-references 4M0819439 and CU 31 003 for the same application.

Compatible With Audi A4, A4 allroad, A4 Quattro, A5 Quattro, A5 Sportback, A7 Sportback, Q5, Q5 PHEV, Q5 Sportback, RS5, RS5 Sportback, S4, S5, S5 Sportback, SQ5, and SQ5 Sportback applications across the listed model years. Search terms such as Audi cabin air filter E4931LI, Hengst HEZ cabin air filter for Audi Q5, and Audi pollen filter replacement E4931LI align with this fitment coverage.

What It Helps Address

• Dust entering the cabin through the HVAC intake
• Pollen buildup in the passenger compartment air stream
• Reduced cabin air filtration performance from a loaded filter
• Routine HVAC service intervals on Audi models
• Replacement of worn OE-style cabin air filters

Installation Notes and Tips

Install E4931LI in the vehicle’s cabin air filter location according to the Audi service procedure for the specific model year and trim. Verify the vehicle’s PR codes and OE reference before ordering, especially on 2021-2024 A4, A5, and Q5 applications where notes reference 9AC, 9AK, or OE No. 4M0 819 439. Confirm the filter orientation matches the HVAC housing before closing the access panel.

Quality Assurance

Hengst is an established filtration brand, and the HEZ Cabin Air Filter line is built for OE-style service replacement in Audi HVAC systems. Part number E4931LI is listed with multiple OE and interchange references to support accurate catalog matching.