CR26-31-1 Air Filter Part Number: Your Essential Replacement Guide

The CR26-31-1 is a precise part number designating a specific high-flowing, rectangular panel air filter designed as a direct replacement for numerous Honda, Acura, and select Isuzu vehicles, ensuring optimal engine performance when sourced as genuine OEM. This critical component safeguards your engine from harmful contaminants and directly impacts power, fuel efficiency, and longevity. Understanding its specifications, applications, installation process, and the importance of using the correct part is vital for any owner of a compatible vehicle. Choosing the genuine CR26-31-1 filter guarantees perfect fitment and engineered protection.

Understanding the CR26-31-1 Air Filter

Air filters like the CR26-31-1 are the first line of defense for your engine. Positioned within the air intake system, they trap dust, dirt, pollen, sand, and other airborne particles suspended in the air drawn into the engine for combustion. Preventing these abrasive contaminants from entering the combustion chambers is crucial. Without an effective filter, particles cause accelerated wear on critical components like cylinder walls, piston rings, and valve guides, leading to decreased performance, increased oil consumption, reduced fuel economy, and potential long-term engine damage. The CR26-31-1 is engineered to provide this essential protection efficiently.

Key Specifications of the CR26-31-1

  • Dimensions: The filter core dimensions measure approximately 9.5 inches in length, 6.875 inches in width, and 1.375 inches in height (241mm L x 175mm W x 35mm H). This precise rectangular shape is critical for proper fitting within the designated airbox.
  • Seal Type: Features a flexible urethane perimeter seal, typically grey or black. This seal creates an airtight closure against the airbox housing, preventing unfiltered air from bypassing the filter media – a common failure point with incorrect or poor-quality filters.
  • Filter Media: Constructs using non-woven synthetic media with a high cellulose content. This design optimizes the balance between high airflow capacity and superior particle-trapping efficiency. Genuine CR26-31-1 filters undergo rigorous testing to ensure consistent performance within specified parameters.
  • Flow Characteristics: Rated as a high-flowing filter within its OEM category. It offers lower restriction compared to some standard filters (though still less restrictive than aftermarket performance filters focused solely on max flow), contributing to improved engine responsiveness under load.
  • Standard Fitment: Designed primarily as a direct drop-in replacement for the factory-installed air filter in compatible vehicles. It interfaces exactly with the original airbox design.

Compatible Vehicles: Where the CR26-31-1 Fits

The CR26-31-1 is a Honda/Acura OEM part number with widespread application across their model lines for specific model years. This part number supersedes older versions like 17220-PLE-003 and 17220-PLE-305. Before purchasing, always verify compatibility using your vehicle's VIN or comparing the physical dimensions and seal type of your existing filter. Core compatible models include:

  • Honda Accord: (Mainly 2008-2012 models, often I4 engines).
  • Honda CR-V: (Primarily 2007-2011 models).
  • Honda Civic: (Notably 2006-2011 models equipped with the 1.8L I4 engine).
  • Honda Element: (Typically 2007-2011 models).
  • Honda Fit (Jazz): (Commonly 2007-2013 models).
  • Honda Pilot: (Generally 2009-2015 models).
  • Honda Ridgeline: (Usually 2009-2014 models).
  • Acura MDX: (Predominantly 2007-2013 models).
  • Acura RDX: (Specifically the 2007-2012 models).
  • Acura TL: (Certain model years within the 2009-2014 generation).
  • Acura TSX: (Primarily the 2009-2014 models).
  • Acura ZDX: (Typically 2010-2013 models).
  • Isuzu Oasis: (1996-1999 models, due to Honda collaboration).
  • Specific Honda Odyssey Models: (Certain model years and trims).

(Important Note: This list provides common applications. Always double-check specific model year and engine combination requirements using official parts catalogs or a reliable VIN lookup tool.)

Installing Your CR26-31-1 Air Filter

Replacing this filter is a straightforward maintenance task accessible to most vehicle owners. Locate the air filter housing within the engine bay – it’s typically a rectangular or square black plastic box situated near the engine intake, secured by metal clips or screws. Gather simple tools like pliers (for stubborn clips) and screwdrivers if needed. Basic safety glasses are recommended to prevent debris falling into eyes.

  1. Access Housing: Release the fasteners securing the top half of the air filter housing (lid). Carefully remove the top cover, noting its orientation.
  2. Remove Old Filter: Lift out the old air filter, taking care not to dislodge any significant debris into the open intake tract below. Visually inspect the old filter condition as a reference point for future changes.
  3. Clean Housing: Before inserting the new filter, inspect the inside of the airbox housing base and intake tube leading from the filter to the engine. Remove any leaves, debris, or loose dirt using a vacuum cleaner with a crevice tool or a soft cloth. Avoid compressed air if possible, as it can push debris further into the intake. Ensure the area is reasonably clean and the sealing surfaces on the housing are free of damage or embedded grit.
  4. Position New Filter (CR26-31-1): Carefully place the genuine CR26-31-1 filter into the airbox base, observing the orientation of the filter seal and the shape of the base. Ensure the filter sits completely flat within the base. The seal must align uniformly with the sealing ridge around the entire perimeter of the airbox base. Any distortion or misalignment compromises the seal.
  5. Reattach Housing: Replace the air filter housing top cover precisely in its original position. Re-secure all clips or screws firmly until they audibly "click" or reach gentle resistance. Do not over-tighten plastic screws. Double-check that the lid is seated evenly around the entire circumference.
  6. Final Check: Ensure all fasteners are secure and no tools or debris remain in the engine bay. Dispose of the old filter responsibly.

Sourcing the Genuine CR26-31-1: Avoiding Counterfeits

Using the genuine OEM CR26-31-1 filter offers guaranteed fitment, assured performance characteristics, and the quality control backing of the Honda/Acura brand. Authorized sources are crucial. Purchase from:

  • Official Honda and Acura Dealerships: Dealership parts counters offer genuine OEM parts sourced directly from Honda (including CR26-31-1).
  • Certified Online OEM Parts Vendors: Reputable online retailers specializing in genuine Honda and Acura parts supply authentic filters. Look for dealers partnered with dealerships or clearly advertising genuine parts.
  • Avoidance of Fakes: Counterfeit filters remain problematic, often sold significantly cheaper than OEM. Warning signs include:
    • Packaging discrepancies: poor quality printing, typos, missing official markings.
    • Filter media irregularities: differing textures, stiffness, or excessive glue bleed-through.
    • Seal issues: overly stiff or sticky seals, visible seams, incorrect colors.
    • Dimensions not precisely matching stated specs.
    • Vendors offering suspiciously low prices lacking credibility.

Investing in the genuine CR26-31-1 protects your engine investment effectively.

Maintenance Schedule & Why Timely Replacement Matters

Consult your vehicle's owner's manual for the manufacturer-recommended air filter change interval specific to your driving conditions. Standard guidance often suggests replacement every 15,000 to 30,000 miles. However, severe driving conditions necessitate more frequent changes. These include:

  • Consistently driving on dusty, gravel, or unpaved roads.
  • Frequent operation in heavy stop-and-go city traffic with high pollution levels.
  • Prolonged driving in areas experiencing high pollen counts.
  • Operating in desert environments or near industrial zones.
  • Extensive idling periods.

A clogged, dirty filter significantly restricts airflow. Reduced airflow leads directly to:

  • Loss of Power and Performance: The engine struggles to breathe, feeling sluggish, especially during acceleration or climbing hills.
  • Reduced Fuel Economy: Insufficient air alters the air/fuel mixture, forcing the engine control unit (ECU) to compensate, often by increasing fuel delivery, lowering miles per gallon.
  • Engine Stress and Potential Damage: Severe restriction forces the engine to work harder just to draw in air, putting extra strain on components and increasing operating temperatures.
  • Increased Emissions: Improper air-fuel ratios can cause incomplete combustion, potentially increasing hydrocarbon (HC) and carbon monoxide (CO) tailpipe emissions, sometimes triggering the "Check Engine" light.
  • Unusual Engine Noises: A highly restricted filter can sometimes cause distinctive whistling or sucking noises from the intake.

Visual inspection is key. Check the filter every 10,000 miles or during oil changes. Hold it up to a bright light source. If the light passing through the media is significantly obscured by embedded dirt over large portions of the element, replacement is due. Visible dust layers on the intake side are also clear indicators. Don't rely solely on mileage; let the filter's condition guide replacement timing, especially under severe conditions.

CR26-31-1 vs. Aftermarket Air Filters: Making an Informed Choice

When choosing between genuine OEM filters and aftermarket alternatives, understanding the performance and quality parameters is crucial. The core differences:

  • Performance: CR26-31-1 is engineered for high airflow efficiency within the constraints of maintaining OEM filtration standards. Many aftermarket filters fall into two categories:

    • Performance: Often advertise higher maximum airflow potential compared to CR26-31-1. They achieve this by using less restrictive media or larger surface area designs. Crucially, achieving this higher flow usually comes with a trade-off: potentially reduced filtration efficiency for very small particles. They may filter most contaminants effectively but could allow more sub-5 or sub-10 micron particles to pass compared to the balanced efficiency of the genuine filter. Some reusable cloth filters require regular oiling, introducing the risk of contamination from excess oil entering the intake (mass airflow sensor damage).
    • Economy: Often meet minimum requirements but may use lower quality materials and construction. Potential issues include:
      • Poor Sealing: Subpar seals lead to unfiltered air bypassing the filter media entirely.
      • Media Collapse: Filter media can deform or collapse under suction, restricting airflow.
      • Diminished Efficiency: May not trap particles as effectively as the OEM specification filter throughout its lifespan.

  • Quality: Genuine CR26-31-1 filters offer predictable performance and guaranteed fitment backed by Honda/Acura engineering. The primary advantages:

    • Fit Guarantee: Engineered to the exact dimensions and sealing requirements of the original airbox.
    • Reliable Filtration: Meets specific Honda/Acura filtration efficiency standards for particle capture over the intended service life.
    • Structural Integrity: The filter frame and media resist deformation under operating conditions.
    • Seal Integrity: The urethane seal maintains an effective barrier preventing leaks.

Frequently Asked Questions (FAQ) on CR26-31-1

  1. Q: What does the Honda CR26-31-1 air filter fit?
    A: The CR26-31-1 fits numerous Honda and Acura models primarily from the mid-2000s to early 2010s. Common applications include Accord (2008-2012), CR-V (2007-2011), Civic (2006-2011 1.8L), Fit (2007-2013), Pilot (2009-2015), Ridgeline (2009-2014), MDX (2007-2013), RDX (2007-2012), TSX (2009-2014), and others. Always verify fitment for your specific year and model.
  2. Q: Is CR26-31-1 the correct Honda air filter for my vehicle?
    A: The only definitive ways to confirm are:
    • Check your owner's manual (Recommended Maintenance Schedule).
    • Cross-reference your Vehicle Identification Number (VIN) in an official parts catalog.
    • Physically remove your old filter and compare its part number and precise dimensions/seal type to the CR26-31-1 specs listed above.
  3. Q: What happens if I don't replace my air filter (e.g., CR26-31-1) on time?
    A: A severely dirty or clogged air filter restricts airflow. This leads to noticeable symptoms including reduced engine power, sluggish acceleration, poorer fuel economy, increased engine strain and operating temperatures, potential "Check Engine" light activation, and increased emissions. Prolonged neglect accelerates engine wear.
  4. Q: Can I use an aftermarket air filter instead of the Honda CR26-31-1?
    A: Yes, many reputable aftermarket brands offer compatible filters (e.g., Bosch, FRAM, WIX, K&N). When considering alternatives:
    • Performance: Recognize that filters emphasizing "high flow" likely sacrifice some filtration efficiency compared to OEM specs. Reusable oiled filters require meticulous maintenance.
    • Economy: Avoid extremely cheap filters; they may lack adequate sealing or construction integrity. Look for well-known brands that state they meet or exceed OEM specifications and filter efficiency standards.
    • Verification: Ensure the aftermarket part explicitly lists compatibility with the CR26-31-1 equivalent (they often reference the superseded Honda part number: 17220-PLE-003 or the vehicle models listed earlier).
  5. Q: How do I know my genuine Honda CR26-31-1 air filter isn't fake?
    A: Purchase exclusively from trusted sources like Honda/Acura dealerships or certified genuine parts retailers online. Inspect packaging thoroughly for high-quality printing, correct Honda logos/branding, and legible part numbers. Examine the filter itself for proper dimensions, a uniform and pliable grey or black urethane seal, and consistent media pleats without excessive glue residue. Highly suspiciously low prices are a major red flag.

Conclusion

The CR26-31-1 air filter is a critical component identified by a specific part number representing precision engineering. It provides essential protection and performance for the engines of numerous Honda, Acura, and some Isuzu vehicles. Ensuring you install the genuine CR26-31-1 filter and replace it according to your vehicle’s schedule or based on visual inspection is fundamental maintenance. This simple action protects your investment by optimizing engine efficiency, safeguarding internal components from premature wear, preserving fuel economy, and maintaining optimal power delivery. Always verify the correct part number for your specific vehicle using trusted methods like VIN lookup and source your filter from authorized vendors to guarantee authenticity and reliable protection. Using the right filter is the smart way to keep your engine running clean and strong.

Back to blog