Protec 691 Engine Air Filter

Engine Air Filter for Acura and Honda

Protec part number 691 is an engine air filter for everyday driving conditions. It uses synthetic media and an air filter panel design to help maintain clean airflow through the intake system.

Key Features

• Synthetic filter media for engine air filtration
• Panel-style construction with a closed top
• Matches OES media area for the application
• Laboratory tested to ISO 5011 standards
• Fits Acura ILX and Honda Civic applications listed below

Detailed Description

Protec 691 is built as a direct engine air filter replacement for select Acura ILX and Honda Civic models. The filter is sized at 9.409 inches long, 7.343 inches wide, and 1.870 inches high, with a closed inner diameter top and synthetic media. Protec states that this filter matches the original equipment supplier media area and delivers 97.5% minimum efficiency based on ISO 5011 laboratory testing. For buyers searching for an Acura ILX engine air filter or Honda Civic air filter, part number 691 provides a fitment-specific option for routine service intervals.

What It Helps Address

• Restricted airflow caused by a dirty or loaded engine air filter
• Reduced intake filtration performance during normal service intervals
• Replacement needs for a worn or overdue air filter element
• Routine maintenance on Acura ILX and Honda Civic intake systems

Installation Notes and Tips

Verify the original equipment part number 17220-R1A-A01 against the vehicle listing before ordering. This filter fits 2014-2015 Acura ILX, N/A; Fits 2013 Acura ILX, N/A; Fits 2014-2015 Honda Civic, N/A; Fits 2012-2013 Honda Civic, N/A. Confirm the air box dimensions and filter orientation during installation.

Quality Assurance

Protec references ISO 5011 laboratory testing and a minimum efficiency rating of 97.5% based on PRO-TEC 362. The filter is engineered to align with OES media area specifications for the listed applications. Part number 691 is also referenced as Pro-Tec 691 in interchange listings.