Finding the best 2004 Honda Civic catalytic converter requires more than choosing the lowest listed price. Engine size, trim, emissions rules, OE reference numbers, and direct-fit design all affect whether a replacement is appropriate.
This guide compares eight supplied listings for shoppers repairing a 2004 Civic 1.7L. It also explains federal-versus-CARB limitations, warranty differences, installation considerations, and the evidence available for each product.
For a 2004 Honda Civic 1.7L meeting federal emissions standards, the Cat Clean listing is the strongest all-around option based on its fitment coverage, 4.4 rating, direct-fit design, and stated 6-year/50,000-mile performance warranty. Verify your trim, emissions region, and OE number before ordering.
Quick Product Comparison
| Product | Image | Best For | Check Price |
|---|---|---|---|
| 1. Amazon Business Cards | Not a catalytic converter; verify before purchase | Check Price | |
| 2. Honda Civic Catalytic Converter Kit |  | Budget direct-fit federal replacement | Check Price |
| 3. maXpeedingrods Civic Catalytic Converter | | EPA-compliant alternative | Check Price |
| 4. Honda Civic Catalytic Converter | | DX, GX, HX, LX, and Value Package coverage | Check Price |
| 5. Honda Civic Acura EL Catalytic Converter | | Extended warranty coverage | Check Price |
| 6. 674-608 Catalytic Converter | | OE-number cross-checking | Check Price |
| 7. Honda Civic Catalytic Converter | | Longest stated performance warranty | Check Price |
| 8. Honda Civic Catalytic Converter | | Lowest supplied price | Check Price |
What to Look for in the Best 2004 Honda Civic Catalytic Converter
Confirm the engine and trim fitment
Most relevant listings specify the 2001–2005 Honda Civic with a 1.7L four-cylinder or L4 engine. Several identify DX, GX, HX, LX, Value Package, or Special Edition coverage, but those details vary by product.
Match the OE or reference number
Numbers such as 18160-PLM-A00, 18160-PLM-A50, 674-608, 16373, and 101304 appear across the supplied listings. Use the number shown for your existing part or vehicle documentation as a cross-check, not as a substitute for complete fitment verification.
Check emissions-region legality
These listings describe federal EPA compliance, while several specifically exclude California, Colorado, Maine, and New York. A federal-compliant converter may not satisfy CARB requirements where those rules apply.
Compare direct-fit installation claims
Several products describe direct bolt-on or direct-fit installation, with some including gaskets and hardware. Installation still depends on the vehicle condition, fasteners, sensors, and exhaust system.
Evaluate substrate and shell claims
The supplied descriptions mention stainless-steel shells, ceramic substrates, and platinum, rhodium, and palladium catalysts. These claims help distinguish listings, but they do not independently establish long-term results.
Read the warranty terms carefully
Coverage ranges from a stated one-year limited warranty to longer structural and emissions-performance warranties. Confirm exclusions, mileage limits, and claim requirements on the current product page.
- Photograph the existing converter label and compare its shape, connection points, and reference numbers before ordering.
- Check local emissions rules before choosing a federal-only replacement.
- Inspect the cause of the original failure so a replacement is not damaged by an unresolved engine or exhaust problem.
Our Top 8 Best 2004 Honda Civic Catalytic Converter Picks and Reviews
1. Amazon Business Cards, Professional Customizable Networking Cards for Branding, Contact Information, and Customer Connections
This listing does not describe a catalytic converter or a Honda Civic replacement part. Its supplied title concerns customizable business cards, so it should not be selected for an exhaust repair.
Key Features That Stand Out
Why It Stands Out
It stands out only because it is materially different from the other supplied records. The mismatch makes careful product-page verification essential.
Best For
Pros and Cons
- The listing title clearly identifies a non-automotive product.
- No catalytic converter features, fitment information, or automotive warranty details are supplied.
2. Front Direct-Fit Catalytic Converter Kit for Honda Civic 2001-2005 1.7L, Replacing 18160-PLM-A50 and 18160-PLM-A00
Listed at $101.99, this front direct-fit kit is specified for 2001–2005 Honda Civic models with the 1.7L four-cylinder engine. Its stated OE references make it a practical cross-check candidate for a 2004 Civic.
Key Features That Stand Out
- Stainless-steel construction is described as suitable for high-temperature exhaust gases.
- Internal ceramic substrates use platinum, rhodium, and palladium catalysts, according to the supplied listing.
- Fitment is stated for 2001–2005 Honda Civic 1.7L four-cylinder models.
- OE references are 18160-PLM-A50 and 18160-PLM-A00.
- A lifetime warranty is stated by the listing.
Why It Stands Out
The combination of clear engine-year fitment, two OE references, direct-fit positioning, and a stated lifetime warranty gives this option a strong evidence-based profile. It is not listed for California emissions standards and is described as not legal for sale in California and New York.
Best For
Pros and Cons
- Clear 1.7L Civic fitment and OE references.
- Direct-fit installation is claimed.
- Lifetime warranty is stated.
- Not suitable for California emissions standards.
- California and New York restrictions require attention before purchase.
3. maXpeedingrods Catalytic Converter for Honda Civic L4 1.7L, 2001-2005 Direct-Fit Replacement Exhaust Emissions Component
At the supplied $98.99 price, this maXpeedingrods converter targets the 1.7L L4 Civic from 2001 through 2005. It emphasizes EPA standards, direct installation, and stainless-steel construction.
Key Features That Stand Out
- Fitment is listed for Honda Civic L4 1.7L models from 2001–2005.
- Reference numbers are 18160-PLM-A50 and 18160-PLM-A00.
- The listing describes EPA compliance for federal emissions standards.
- Included gaskets and hardware are stated, with no additional modifications claimed.
- Stainless steel and ceramic substrates with Pt, Rh, and Pd catalysts are specified.
Why It Stands Out
Its supplied price is below several other comparable listings, while the feature set includes reference numbers, federal EPA positioning, and included installation hardware. It is excluded from use in California, Maine, Colorado, and New York.
Best For
Pros and Cons
- Clear 1.7L L4 compatibility.
- Gaskets and hardware are stated as included.
- Federal EPA compliance is claimed.
- Not for California, Maine, Colorado, or New York registered vehicles.
- The supplied review count is 22, so the displayed rating has a smaller review base than several alternatives.
4. Direct-Fit Catalytic Converter for Honda Civic DX, GX, HX, LX 2001-2005 1.7L L4, EPA Compliant Replacement
This $99.99 direct-fit listing covers several Civic trims and the 2004–2005 Value Package. Its supplied description focuses on EPA compliance, high-flow design, and a one-year limited warranty.
Key Features That Stand Out
- Fitment includes Civic DX, GX, HX, LX, and Value Package models with the 1.7L L4 engine.
- The direct-fit design is described as validated for fit.
- The listing describes a high-flow design and EPA compliance.
- It is not for California, Maine, Colorado, or New York registered vehicles.
- A one-year limited warranty for manufacturer defects is stated.
Why It Stands Out
The trim coverage is more detailed than some listings, which can help shoppers compare a 2004 Civic DX, GX, HX, LX, or Value Package. The emissions restrictions and limited warranty make regional verification especially important.
Best For
Pros and Cons
- Detailed trim and Value Package coverage.
- Direct-fit construction is claimed.
- One-year limited warranty is stated.
- Not CARB compliant.
- Shorter stated warranty than several competing listings.
5. Front Catalytic Converter for Honda Civic and Acura EL 2001-2005, 1.7L L4 EPA-Compliant Replacement
Priced at $96.99 in the supplied data, this front converter covers 1.7L Civic and Acura EL applications. Its strongest differentiator is the stated structural and emissions-performance warranty coverage.
Key Features That Stand Out
- Fitment includes 2001–2005 Civic DX, GX, HX, LX, Value Package, and 2005 LX Special Edition applications.
- Reference numbers include 18160-PLM-A00, 18160-PLM-A50, 674-608, 16373, and 101304.
- An OEM-grade 400-cell ceramic substrate is stated.
- The listing describes EPA compliance but not CARB compliance.
- A 5-year structural warranty and 2.5-year/25,000-mile emissions-performance warranty are stated.
Why It Stands Out
This option offers broad stated application coverage and several reference numbers for cross-checking. Its warranty terms are more detailed than many listings, although the product remains intended for federal standards rather than CARB-regulated applications.
Best For
Pros and Cons
- Broad Civic trim coverage.
- Multiple reference numbers are supplied.
- Detailed structural and emissions warranty terms.
- Not CARB compliant.
- Warranty eligibility and regional restrictions should be confirmed before purchase.
6. Front Catalytic Converter Replacement for Honda Civic and Acura EL 2001-2005 1.7L L4, EPA Compliant 674-608
This $98.99 front replacement is labeled 674-608 and covers 1.7L Civic and Acura EL applications from 2001–2005. It shares several reference numbers and warranty terms with the other extended-coverage listings.
Key Features That Stand Out
- Fitment is stated for 2001–2005 Honda Civic and Acura EL 1.7L L4 vehicles.
- Reference numbers include 18160-PLM-A00, 18160-PLM-A50, 674-608, 16373, and 101304.
- A stainless-steel shell and OEM-grade 400-hole ceramic substrate are described.
- The listing states federal EPA approval and excludes CARB applications.
- A 5-year structural and 2.5-year/25,000-mile emissions-performance warranty is supplied.
Why It Stands Out
The 674-608 designation and extensive reference-number list make this a useful option for shoppers matching an existing catalog number. It is recommended by the listing for professional auto repair shop installation.
Best For
Pros and Cons
- Strong reference-number coverage.
- Extended warranty terms are stated.
- Front position and 1.7L fitment are clearly described.
- Not legal for the listed CARB-regulated states.
- Professional installation is recommended, which may add labor cost.
7. Catalytic Converter for Honda Civic DX, GX, HX, and LX 2001-2005 1.7L L4, Direct-Fit Replacement
At $103.99, this direct-fit converter covers multiple Civic trims and Acura EL 1.7L applications. Its supplied 4.4 rating is tied with the highest displayed rating in this comparison, and its stated performance warranty is the longest listed.
Key Features That Stand Out
- Fitment includes 2001–2005 Civic 1.7L L4 and Acura EL 1.7L L4 models.
- Reference numbers include 674608 and 16373.
- A high-density ceramic substrate with Pt, Rh, and Pd catalysts is described.
- The shell is identified as 409L stainless steel with a high-temperature-resistant pad.
- A 6-year/50,000-mile performance warranty is stated.
Why It Stands Out
The combination of direct installation, broad trim coverage, a 4.4 displayed rating, and the longest stated performance warranty makes this a compelling all-around candidate. It remains limited to vehicles meeting federal emissions standards.
Best For
Pros and Cons
- Highest displayed rating alongside product 3.
- Direct bolt-connection design is claimed.
- Longest stated performance warranty.
- Not for California, Colorado, New York, or Maine.
- Its supplied price is higher than several alternatives.
8. EPA-Compliant Catalytic Converter for Honda Civic DX, EX, GX, HX, and LX 2001-2005 1.7L Replacement
The HIGHBRICK listing has the lowest supplied price at $69.99 and covers 2001–2005 Honda Civic 1.7L applications. It describes direct bolt-on installation with gaskets and hardware, but regional restrictions remain important.
Key Features That Stand Out
- Fitment includes Civic DX, EX, GX, HX, and LX trims with the 1.7L engine.
- The listing states EPA compliance for federal requirements.
- Stainless steel and ceramic construction are described.
- Direct bolt-on installation is claimed without welding, cutting, or modifications.
- Gaskets and hardware are stated as included.
Why It Stands Out
This is the entry-level price option in the supplied comparison while still offering broad trim coverage and direct-fit installation claims. The displayed 3.9 rating is lower than the other catalytic converter listings, so shoppers should weigh price against the available evidence.
Best For
Pros and Cons
- Lowest supplied price.
- Broad DX, EX, GX, HX, and LX fitment.
- Gaskets and hardware are stated as included.
- Lowest displayed rating among the catalytic converter listings.
- Not legal for California, New York, Colorado, or Maine applications.
Do not install a federal EPA-only converter where CARB requirements apply. Several supplied listings specifically exclude California, Colorado, New York, and Maine. Confirm local regulations, vehicle fitment, and installation requirements before purchase.
Complete Buying Guide for Best 2004 Honda Civic Catalytic Converter
Compatibility and intended use
Start with the Civic’s 1.7L engine, trim, model year, and emissions configuration. The supplied listings generally cover 2001–2005 vehicles, but individual trim coverage differs. Product 1 is not an automotive part and should be excluded from a catalytic converter purchase.
Compare the product’s OE or reference numbers with your existing component and vehicle records. If the converter is described as front-positioned, confirm that position matches the part being replaced.
Federal and CARB considerations
EPA compliance does not automatically mean CARB compliance. The catalytic converter listings supplied here repeatedly state that they are unsuitable for California and, in several cases, Colorado, New York, and Maine. Verify the rules that apply to the vehicle’s registration location.
Installation and maintenance
Direct-fit and bolt-on claims may reduce fabrication needs, but seized fasteners, damaged flanges, exhaust leaks, sensor issues, or other vehicle conditions can affect installation. Follow the product instructions and consider qualified installation when access or exhaust work presents a safety risk.
A replacement converter may not solve the underlying cause of an emissions fault. Before installation, diagnose related engine, fuel, ignition, exhaust-leak, and sensor concerns as appropriate for the vehicle.
The $69.99 listing suits federal-emissions shoppers prioritizing purchase price, direct bolt-on claims, and broad stated trim coverage.
Listings around $96.99–$101.99 add reference-number detail, stainless-steel descriptions, direct-fit claims, and varying warranty coverage.
The $103.99 option costs more but states a 6-year/50,000-mile performance warranty and direct-fit federal application coverage.
Useful repair preparation
If you need additional hand tools for exhaust work, review our guide to 1-1/16-inch sockets for car repairs and confirm the required sizes for your vehicle before starting.
For broader roadside planning after the repair, our comparison of portable car jump starters may help with emergency equipment selection. A phone charger can also be useful when arranging roadside assistance; see our guide to a fast car charger for Android phones.
- Verify year, engine, trim, emissions region, converter position, and reference number.
- Inspect the current exhaust connections and check the latest warranty terms.
- Use safe lifting practices and follow the manufacturer’s installation instructions.
- Do not assume every 2001–2005 Civic listing fits every 2004 configuration.
- Do not use a federal-only converter where CARB compliance is required.
- Do not treat a converter replacement as guaranteed correction of an emissions fault.
- Save screenshots of the fitment and warranty details at the time of purchase.
- Compare both OE numbers and physical connection points before removing the original part.
- After installation, inspect for exhaust leaks and follow applicable emissions-testing procedures.
Before ordering, confirm the vehicle’s 1.7L engine, trim, emissions region, converter position, and matching reference number. Before installation, confirm the vehicle is securely supported and the exhaust has cooled.
- Product 1 is a business-card listing and is not suitable for a catalytic converter repair.
- Product 2 offers 1.7L fitment, two OE references, direct-fit claims, and a stated lifetime warranty.
- Product 3 combines a $98.99 supplied price with federal EPA positioning and included hardware claims.
- Product 4 provides detailed DX, GX, HX, LX, and Value Package coverage.
- Product 5 offers broad reference-number coverage and extended structural and emissions warranties.
- Product 6 is a 674-608 option with matching reference numbers and extended warranty terms.
- Product 7 has a 4.4 displayed rating and the longest stated performance warranty.
- Product 8 has the lowest supplied price and broad trim coverage but a lower displayed rating.
- Always verify emissions-region legality before ordering.
- Confirm the exact vehicle and reference-number fit before installation.
Frequently Asked Questions About Best 2004 Honda Civic Catalytic Converter
The Cat Clean listing is the strongest overall candidate from the supplied evidence because it states broad 1.7L fitment, direct installation, a 4.4 rating, and a 6-year/50,000-mile performance warranty. Confirm the vehicle’s emissions region and reference number first.
No. The listings differ by engine, trim, converter position, reference number, and emissions configuration. Verify the complete vehicle details on the current product page before ordering.
The supplied catalytic converter listings generally state federal EPA compliance rather than CARB compliance. Several specifically say they are not for California, so California shoppers should verify CARB requirements and approved applications.
Supplied listings reference numbers including 18160-PLM-A00, 18160-PLM-A50, 674-608, 674608, 16373, and 101304. Match the applicable number to your vehicle records and current converter before purchasing.
Several listings describe direct-fit or direct bolt-on installation without modifications, and one states that gaskets and hardware are included. Actual installation can still depend on fasteners, flanges, sensors, and exhaust condition.
No replacement can guarantee a successful repair or inspection result. The underlying cause of an emissions code should be diagnosed, and the vehicle should be checked for related engine, sensor, and exhaust problems.
The best 2004 Honda Civic catalytic converter depends first on accurate fitment and emissions legality. For many federal-emissions 1.7L Civic owners, the Cat Clean listing offers the most persuasive combination of stated coverage, rating, direct-fit design, and warranty length.
Shoppers seeking a lower entry price can consider the HIGHBRICK listing, while the other options provide useful alternatives based on OE references, trim coverage, hardware claims, or warranty terms. Prices, availability, and product-page details can change, so verify the current listing before purchase.
This roundup used only the supplied product titles, prices, scraped ratings, review counts, images, affiliate links, and extracted feature statements. Products were compared for stated Civic 1.7L fitment, reference numbers, emissions-region limitations, direct-fit claims, construction descriptions, installation details, warranty language, and displayed value. Product 1 does not describe an automotive component and was retained because it appeared in the supplied eight-record dataset. No first-hand testing, installation, ownership, customer interviews, or independent emissions verification was available.