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If your 2018-2022 Honda Accord is showing emissions faults or poor engine response, the catalytic converter is a common component to inspect. The right catalytic converter restores emissions control, helps clear catalytic-related fault codes, and preserves exhaust flow and performance for daily driving.This guide covers seven shortlisted catalytic converters specially selected for the 2018-2022 Accord. We evaluate each option for correct fitment, emissions effectiveness, and durability so you can pick the one that matches your goals and installation readiness. Read on to understand the key tradeoffs and technical considerations before you replace the component.
Looking for other parts? See all Honda Accord parts & accessories.
Top Picks at a Glance
| Best Overall The best all-around choice for most situations | Northeastern Exhaust Stainless Steel EPA-Approved Direct-Fit Front Catalytic Converter for Honda Accord 2018–2022 2.0L |  |
| Best Quality Built to a higher standard if you want something more solid | AISIN Front Catalytic Converter CCTH-00305 (EPA Compliant) |  |
| Best Value The sweet spot between price and what you get | Sechune Front Catalytic Converter Direct-Fit for Honda Accord 2018–2022 1.5L |  |
| Best Budget The cheapest option that still gets the job done reliably | CIRconvert High-Flow Catalytic Converter for Honda Accord 1.5L L4 (2018–2022) |  |
| Highest Rated A top-rated pick with lots of positive feedback | ECHO AUTOMILES Catalytic Converter for Honda Accord 1.5L (2018–2022) |  |
| Most Popular A crowd favorite that many people choose with confidence | Pulcherflow Catalytic Converter for 2018–2022 Honda Accord 1.5L |  |
| Best Seller A high-volume bestseller chosen again and again | PREMIER MILES Catalytic Converter for Honda Accord 2018–2022 1.5L (EPA Compliant) |  |
1. Northeastern Exhaust Stainless Steel EPA-Approved Direct-Fit Front Catalytic Converter for Honda Accord 2018–2022 2.0L
| Manufacturer | Northeastern Exhaust |
|---|---|
| Exterior | Stainless Steel |
| Position | Front |
| Manufacturer Part Number | NEC-506448 (CAT-41331) |
This Northeastern Exhaust catalytic converter is an EPA-approved direct-fit replacement for the front position on 2018–2022 Honda Accord 2.0L models. Made from 409-grade stainless steel, it is built to resist corrosion and handle the high temperatures and vibrations of daily driving. The direct-fit design means installation typically bolts into the existing exhaust path without cutting or custom fabrication, making it suitable for DIYers and shops that want a straightforward swap. EPA approval ensures it meets federal emissions standards but it is not CARB-compliant so it cannot be used in states with stricter rules. The converter is intended to restore emissions control and can help maintain engine performance and fuel efficiency by keeping exhaust flow within designed parameters. A one-time replacement warranty is offered for defects, though labor and installation costs are not covered. If you need a factory-style emissions replacement for a balanced mix of durability and compliance outside CARB states, this unit covers the essentials well.
Best for: Buyers who want a straightforward, factory-style emissions replacement that balances durability, legality under federal rules, and ease of installation for regular road use.
Less Ideal for: Drivers in states with CARB regulations or those who need a certified California-compliant converter should look for a CARB-approved unit instead.
- EPA-approved for federal emissions compliance
- Direct-fit design for bolt-in installation without major modifications
- Constructed from 409-grade stainless steel for corrosion resistance
- Designed specifically for the front position on 2018–2022 Honda Accord 2.0L
- Not CARB-compliant so it cannot be used in California or Colorado
Verdict: A practical, EPA-approved direct-fit replacement that restores emissions control and installs with minimal fuss on 2018–2022 Accord 2.0L models.
2. AISIN Front Catalytic Converter CCTH-00305 (EPA Compliant)
| Manufacturer | AISIN |
|---|---|
| Manufacturer Part Number | CCTH-00305 |
| OEM Part Number | 181506A0L00 |
| Special Features | Located at the Front Side |
| Applicable Vehicles | Honda Accord 2018-2022 L4 1.5L |
This front catalytic converter from Aisin is a direct-fit, EPA-compliant replacement designed for the 2018–2022 Honda Accord with the 1.5L L4 engine. It installs in place of the factory unit and is intended to restore proper emissions control and exhaust flow for OBDII-equipped vehicles. The unit is engineered for a precise fit to simplify installation and reduce the need for modification, and the construction emphasizes durability for long-term operation. Because it is EPA-compliant it meets federal emissions requirements but is not certified for sale in some states with their own emissions rules. Typical users will bolt this in during a catalytic converter replacement or as part of a repair after damage; professional installation is recommended for correct fitment and sealing. The practical benefits are restored emissions performance, factory-style fit, and the backing of an established parts manufacturer. Expect the price point to reflect a quality, direct-replacement unit and note that it may not be legal in certain states with stricter emissions standards.
Best for: Buyers who prioritize restoring emissions performance with a high-quality, factory-style replacement for a 2018–2022 Accord 1.5L and who value a durable part from a recognized automotive supplier.
Less Ideal for: Drivers who need a catalytic converter certified for states with stricter emissions regulations or those seeking performance-tuned aftermarket converters with different flow characteristics.
- Direct-fit design for 2018–2022 Honda Accord 1.5L L4 which simplifies installation
- EPA-compliant for federal emissions standards on OBDII vehicles
- Manufactured by an established automotive supplier with factory-quality engineering focus
- Built to restore emissions control and exhaust flow to factory-spec performance
- Not legal for sale or use in certain states with their own emissions standards
Verdict: Choose this Aisin front catalytic converter when you want a durable, factory-style, EPA-compliant replacement for a 2018–2022 Honda Accord 1.5L to restore emissions performance reliably.
3. Sechune Front Catalytic Converter Direct-Fit for Honda Accord 2018–2022 1.5L
| Vehicle fitment | Honda Accord 2018-2022 L4 1.5L |
|---|---|
| Exterior | Stainless Steel |
| Manufacturer part number | 45158 |
| Compliance | EPA-compliant (not CARB-compliant) |
This Sechune front catalytic converter is a direct-fit replacement made for the 1.5L Honda Accord model years 2018 through 2022. It installs in place of the factory front converter and is intended to restore proper emissions control after a failed unit. Constructed from stainless steel with an extended catalyst chamber, the unit is positioned to deliver stable conversion efficiency and a longer service life compared with basic aftermarket cores. Typical use is a bolt-in replacement during an exhaust repair or emissions failure repair; the direct-fit design helps reduce fabrication or modification at installation. Important caveats are state emission rules and compliance: this unit is EPA-compliant but not CARB-compliant, so it is not legal for sale or installation in several states with stricter regulations. The seller offers a one-year warranty which can help with early failures, but buyers should confirm exact fit using reference numbers and local emission labeling before ordering.
Best for: Buyers who prioritize a straightforward, factory-style replacement to get a 2018–2022 Accord back to proper emissions operation with minimal custom work.
Less Ideal for: Motorists in states requiring CARB-compliant parts or buyers looking for a converter specifically certified for California-equivalent emissions programs.
- Direct-fit design tailored for 2018–2022 Honda Accord 1.5L to simplify installation
- Stainless steel exterior and extended catalyst chamber for improved durability and conversion efficiency
- EPA-compliant for federal emission standards outside CARB states
- Includes matching manufacturer part numbers for easy cross-referencing at repair shops
- Not CARB-compliant so it cannot be used in states with California-equivalent regulations
Verdict: Choose this direct-fit Sechune front catalytic converter when you need a durable, factory-style replacement to restore emissions control on a 2018–2022 Honda Accord 1.5L.
4. CIRconvert High-Flow Catalytic Converter for Honda Accord 1.5L L4 (2018–2022)
| Vehicle fitment | Honda Accord 1.5L L4 2018-2022 |
|---|---|
| Construction | Stainless steel |
| Certification | EPA certified (46 states) |
| Interchange part | 679526 |
This catalytic converter is a direct-bolt replacement for the 2018–2022 Honda Accord 1.5L four-cylinder and is built from stainless steel with laser-cut and welded construction for durability and heat resistance. It installs without welding, making it suitable for routine exhaust repairs or replacing a failed OEM converter. The unit is described as high-flow and EPA certified for use in 46 states, so it keeps emissions control intact while aiming to reduce exhaust restriction compared with a restrictive factory unit. Practical benefits include durable materials, straightforward bolt-on fitment, and a 50,000-mile limited warranty that provides some long-term reassurance. Limitations are the restricted legal use in several states and that high-flow designs can vary in how much they affect backpressure and sensors compared with the original part. Buyers should expect a like-for-like replacement experience but verify local emissions requirements before purchasing.
Best for: Drivers replacing a failed catalytic converter on a 2018–2022 Accord 1.5L who want a durable, straightforward bolt-on replacement that preserves emissions compliance while prioritizing affordability.
Less Ideal for: Drivers in states with stricter emissions rules or those who need a California-compliant part should look for a converter specifically approved for those jurisdictions.
- Direct-fit bolt-on design for 2018–2022 Honda Accord 1.5L L4 reduces installation time and complexity
- Stainless steel construction with laser welding offers improved durability and heat resistance
- EPA certified for use in most states to maintain emissions compliance
- High-flow design aims to reduce exhaust restriction compared with some factory converters
- Not legal for use or shipment to California, Colorado, New York, or Maine
Verdict: A budget-friendly, direct-fit replacement that restores emissions compliance and durability for 2018–2022 Accord 1.5L owners who need a straightforward fix.
5. ECHO AUTOMILES Catalytic Converter for Honda Accord 1.5L (2018–2022)
| Vehicle fitment | Honda Accord 2018–2022 L4 1.5L |
|---|---|
| Honeycomb cell count | 400-cell |
| Compliance | EPA compliant |
| Includes | Gaskets and hardware |
This catalytic converter is built as a direct replacement for the 1.5L turbo Accord (2018–2022) and is intended to restore emissions control while keeping engine performance close to factory behavior. It uses a 400-cell honeycomb substrate with a high precious-metal loading to reduce exhaust pollutants and is advertised as meeting federal EPA standards. The higher cell count and high-flow structure aim to limit backpressure so the engine’s power and fuel economy are preserved. The unit ships with the gaskets and hardware needed for install, which helps simplify a bolt-in swap for a competent DIYer or shop. Note the listing restricts sale and installation in some states, so local compliance checks are required before buying. Also, while the part references OEM interchange numbers for fitment, purchasers should verify fitment to the exact engine and model year before installation.
Best for: Buyers prioritizing a reliable, factory-like emissions replacement for a 2018–2022 Accord 1.5L who want a direct-fit unit that aims to preserve engine performance and pass federal emissions checks.
Less Ideal for: Do not choose this part if you live in a state with local restrictions or need a custom or performance-tuned converter for modified engines.
- Direct-fit replacement listed specifically for 2018–2022 Honda Accord 1.5L for straightforward installation
- 400-cell honeycomb substrate with high precious-metal loading for strong pollutant conversion
- High-flow design that reduces exhaust backpressure to help preserve engine power and fuel economy
- Includes necessary gaskets and hardware to simplify installation
- Not eligible for sale or installation in certain states, limiting use depending on local regulations
Verdict: A factory-style, EPA-compliant direct replacement for 2018–2022 Accord 1.5L owners who want a reliable emissions fix without sacrificing engine performance.
6. Pulcherflow Catalytic Converter for 2018–2022 Honda Accord 1.5L
| Vehicle fitment | 2018-2022 Honda Accord 1.5L l4 |
|---|---|
| EPA compliance | Meets U.S. EPA federal emissions criteria |
| Interchange number | 679526 |
| Construction | Stainless steel shell; large honeycomb ceramic substrate |
This Pulcherflow catalytic converter is a direct-fit replacement for the 2018–2022 Honda Accord 1.5L that aims to restore emissions control without major modification. It uses a large honeycomb ceramic substrate with increased precious metal loading to improve purification and meets EPA compliance for federal emissions models. The unit is constructed from stainless steel with mandrel-bent piping and factory-style mounting flanges so installation typically lines up with existing bolt points and comes with gaskets and hardware. In real-world use it serves as a straightforward repair when a failed converter triggers a check-engine light or causes emissions test failure. Buyer-oriented benefits include corrosion resistance, higher catalyst surface area for better conversion, and the convenience of a direct-fit design. Important limitations: it is not legal for sale or use in certain state emissions programs and some buyers reported occasional flange orientation or fastener fit issues that may require swapping hardware or minor adjustment during installation.
Best for: Buyers who prioritize a proven replacement that restores emissions performance and prefers a direct-fit part that minimizes fabrication and downtime; social-proof and reliability are important when choosing an aftermarket converter.
Less Ideal for: Drivers in states with stricter emissions regulations or those who need a California-compliant catalytic converter should look for parts certified for those specific state programs.
- Direct-fit design with factory-style flanges and included gaskets and bolts for simpler installation
- EPA compliant for federal emissions models and larger substrate for improved conversion efficiency
- Stainless steel shell and mandrel bends resist corrosion and high heat for longer service life
- Not legal for sale or use in several states with strict emissions rules
- Some buyers reported flange orientation or bolt compatibility issues requiring reuse of original hardware
Verdict: Choose this Pulcherflow direct-fit catalytic converter if you want an EPA-compliant, stainless-steel replacement that restores emissions control for a 2018–2022 Accord 1.5L with minimal modification.
7. PREMIER MILES Catalytic Converter for Honda Accord 2018–2022 1.5L (EPA Compliant)
| Vehicle compatibility | Honda Accord 2018-2022 1.5L |
|---|---|
| Substrate | 400-cell ceramic |
| Compliance | EPA-compliant (25,000-mile test) |
| Manufacturer | PREMIER MILES |
This PREMIER MILES catalytic converter replaces the factory unit on 2018–2022 Honda Accord 1.5L vehicles and is built to meet EPA long-term emissions requirements. It uses a 400-cell ceramic substrate and precious metal catalysts to restore catalytic function, reduce backpressure, and help clear P0420-style fault codes. Installation is typical for a bolt-on converter but some buyers report heat shield bolt differences or missing shield fittings that may require new hardware or minor welding work. The converter is marketed as EPA-compliant and passed the 25,000-mile road test, which is reassuring for emissions performance in non-CARB states. Practical benefits include improved exhaust flow and likely restoration of drivability and fuel efficiency when a clogged or failing converter is the issue. Trade-offs are fitment variability for some vehicles and the need to address heat shield attachment separately in a few cases, which can add time or cost during installation.
Best for: A buyer who wants a factory-quality emissions replacement that restores catalytic function and clears emissions codes while prioritizing tested, compliant performance over lowest-cost options.
Less Ideal for: Drivers subject to California or CARB emissions rules should avoid this unit because it is not CARB compliant; also avoid if you need a guaranteed bolt-perfect, plug-and-play swap without any possible heat shield or alignment work.
- EPA-compliant and passed the 25,000-mile emissions durability test
- OEM-grade 400-cell ceramic substrate for efficient exhaust flow and lower backpressure
- Built with precious metal catalysts aimed at reliable long-term emissions control
- Designed specifically for 2018–2022 Honda Accord 1.5L fitment
- Some units lack OEM heat shield fittings or use different bolt lengths, which can require additional hardware or welding
- A few buyers reported alignment issues requiring muffler shop adjustments
Verdict: Choose this EPA-tested, factory-style replacement if you want a reliable emissions fix for a 2018–2022 Accord 1.5L that prioritizes proven compliance and restored performance.
Choosing the Right 2018-2022 Honda Accord Catalytic Converter: Key Factors to Consider
Correct Fitment and Pipe Geometry
Accurate fitment is the first and most practical concern. The 2018-2022 Accord uses specific pipe diameters, hanger locations, and flange patterns; a converter that does not match those dimensions will require cutting, adapting, or new hangers.
Improper fitment increases installation time and costs and can introduce leaks or stress points that cause premature failure. Confirming flange bolt pattern, inlet and outlet diameters, and distance between mounting points helps avoid alignment issues. For owners doing their own replacement, a direct-fit unit reduces complexity and the chance of exhaust leaks that trigger diagnostic codes.
Emissions Compliance and Substrate Type
The catalytic substrate and its coating determine how effectively the converter reduces hydrocarbons, carbon monoxide, and NOx. Different substrate constructions and washcoat loadings affect conversion efficiency, especially during cold starts and during varying engine loads.
Verify that the converter's emissions performance aligns with local requirements. A higher washcoat loading and appropriate cell density usually improves conversion but can increase backpressure. Knowing the substrate type helps balance emissions control against potential effects on engine efficiency and throttle response.
Backpressure and Exhaust Flow
Catalytic converters introduce some backpressure by design, but excessive restriction can reduce engine power and cause drivability issues. For the Accord, matching the converter's internal flow characteristics to the stock exhaust geometry helps preserve throttle response and fuel trim.
Consider whether the replacement is a direct-fit unit engineered to approximate factory flow. If a high-restriction substrate is chosen for emission reasons, be aware it may affect acceleration and may trigger a different range of engine control adaptations over time.
Durability and Corrosion Resistance
Exhaust components face heat cycling and corrosive environments. Materials such as stainless steel shell construction and robust internal bonding extend the life of a catalytic converter and resist rust around welds and flanges.
Choose units with quality welding, protected flanges, and coatings where available. Long service life reduces chances of future failures and the need for repeat replacements. For vehicles driven in areas with road salt or coastal exposure, corrosion resistance is especially important to prevent exhaust leaks and structural failure.
Sensor Compatibility and OBD-II Behavior
Modern Accords rely on upstream and downstream oxygen sensors and catalyst efficiency monitoring to detect converter performance issues. A replacement must provide correct sensor bungs and positioning so the vehicle's diagnostics can read expected values.
Incorrect sensor placement or wrong bung locations can produce false fault codes or prevent the engine control unit from detecting a real failure. Ensuring the unit accommodates the 2018-2022 Accord sensor layout preserves normal OBD-II behavior and reduces the risk of a persistent check-engine light related to catalyst efficiency.
Installation Complexity and Hardware
Some catalytic converters are true direct-fit units with all required gaskets and hardware, while others are intended for professional shops and may require supplemental components. Assess whether the converter includes gaskets, flanges, and replacement hangers if the original mounting is compromised.
Installation complexity affects labor time and potential additional parts needed. For DIYers, choosing a unit with pre-welded hangers and supplied hardware reduces unexpected trips to the parts store. Also consider whether the replacement requires cutting and welding; if so, plan for a qualified welder or a shop visit.
Signs Your Accord Needs a Catalytic Converter Replacement
Many catalytic converter issues show up as drivability changes and diagnostic trouble codes. Common vehicle-level symptoms include reduced acceleration, a persistent check-engine light related to catalyst efficiency, and an exhaust smell that indicates incomplete conversion.
Listen for rattling noises from under the car which may indicate a broken substrate. Some owners notice lower fuel economy or rough idling when the converter is partially clogged. Early detection of these signs helps avoid downstream damage to sensors and the exhaust system.
- Persistent check-engine light with catalyst-related codes
- Reduced throttle response or acceleration lag
- Rattling from the converter housing when cold or during acceleration
- Strong exhaust odors or visible smoke under heavy load
How Fitment Differences Affect Installation
Even small deviations in pipe diameter, hanger placement, or flange design can turn a quick replacement into a multi-hour job. Direct-fit converters are built to match the Accord's factory geometry and minimize modifications.
If you choose a universal or semi-universal unit, expect to weld, cut, or adapt sections of the exhaust. That can affect labor costs and may change exhaust routing, so confirm whether the selected converter includes the necessary brackets and gaskets for the 2018-2022 Accord.
- Direct-fit: less cutting, bolt-on installation, lower leak risk
- Universal: may require cutting, welding, and custom hangers
- Verify included gaskets and hardware before starting the job
Matching Emissions Needs to Local Regulations
Different regions have varying emissions standards and inspection processes. When replacing the catalytic converter, ensure the unit meets the emissions requirements applicable to where the vehicle is registered and driven.
Some replacements are designed to meet or approximate regulatory performance for catalytic conversion. Confirm documentation or certification where required by local testing programs to avoid inspection failures and penalties.
- Check local emissions inspection requirements before purchasing
- Look for documented compliance or measured conversion data when available
- Retain installation records and part specifications for inspections
DIY Replacement Tips for the 2018-2022 Accord
If you plan to replace the catalytic converter yourself, prepare by lifting the car safely and having replacement gaskets, new bolts, and anti-seize on hand. Penetrating oil and time to let rusted bolts loosen can save frustration.
Mark sensor locations and disconnect oxygen sensors carefully to avoid damage. Use proper torque on flange bolts and verify there are no exhaust leaks after installation. If welding is required, ensure clean surfaces and secure fitment to prevent premature failure.
- Use penetrating oil on old bolts and allow soak time
- Label and protect oxygen sensors during removal
- Test drive and recheck joints for leaks after installation
Long-Term Maintenance and What to Watch For
After replacement, monitor the vehicle for return of catalyst-related fault codes and check for any change in fuel economy or engine response. Regular inspections of heat shields, hangers, and welds help catch corrosion or loosening early.
Avoid persistent engine misfires or oil/antifreeze contamination of the exhaust, as these conditions accelerate converter degradation. Address upstream engine issues promptly to preserve the life of the new unit.
- Inspect hangers and flanges for corrosion annually
- Address misfires or coolant leaks quickly to protect the catalyst
- Keep records of installation and parts used for future reference
Still looking for the perfect fit?
Select your Honda Accord configuration to see the most relevant Catalytic Converters recommendations
How We Chose the Best 2018-2022 Honda Accord Catalytic Converter
We started by narrowing candidates to replacements designed specifically for 2018 through 2022 Honda Accord fitment and pipe routing. Primary evaluation criteria included physical fitment and flange alignment, emissions performance and catalyst substrate type, and compliance with applicable local emissions requirements.Durability was assessed through material choices, corrosion resistance, and expected lifespan based on construction. Flow characteristics and backpressure impact were considered to ensure the converter would not degrade throttle response or fuel trim significantly. Ease of installation and available mounting hardware were included to reflect real-world garage and DIY constraints.We excluded universal, heavily modified, or vehicle-agnostic converters that require custom fabrication or extensive exhaust work. Also excluded were units lacking clear fitment specifications for the 2018-2022 Accord or missing substrate and material details. The final list reflects a balance of proper fitment, emissions control, longevity, and installation practicality.
Our full evaluation process is outlined in our review methodology.
FAQ
What causes catalytic converter failure on a 2018-2022 Accord?
Failures often stem from prolonged engine misfires, oil or coolant contamination, or physical damage from road debris. Heat cycling and corrosion can also degrade the substrate over time.
Will replacing the catalytic converter clear a check-engine light?
It often does for codes specifically tied to catalyst efficiency, but the light may persist if upstream issues like oxygen sensor faults or engine misfires are unresolved.
Can I install a catalytic converter myself on this Accord?
Yes, if you have the right tools and the replacement is a direct-fit unit. Expect to need penetrating oil, proper gaskets, and possible oxygen sensor handling. Welding or cutting increases complexity.
How long should a replacement catalytic converter last on an Accord?
Lifespan varies with driving conditions and maintenance. Under normal conditions, quality replacements typically last many years, but exposure to contamination or corrosion shortens service life.
Do I need to replace oxygen sensors when changing the converter?
Not always, but inspect sensor condition and readings. If sensors are old or showing out-of-range values, replacing them during the job reduces the chance of future codes and ensures accurate monitoring.
How do I confirm the new converter fits the 2018-2022 Accord?
Check the supplier's fitment specifications for the 2018-2022 Honda Accord, compare inlet/outlet diameters, flange types, and hanger positions, and verify sensor bung locations before purchase.
Final Verdict
Prioritize correct fitment, emissions compliance, and durability when selecting a catalytic converter for your 2018-2022 Honda Accord. Balancing substrate effectiveness against potential backpressure and ensuring proper sensor placement will minimize diagnostic issues and preserve drivability.If you value a straightforward installation, choose a direct-fit unit with the necessary hardware. If emissions certification is required in your area, confirm documented compliance. Focus on the tradeoffs discussed here to pick the converter that meets your emissions needs and installation capabilities.
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