How Much Is a Catalytic Converter for a 2008 Honda Civic?

Expect to pay roughly $200–$600 for an EPA-compliant aftermarket catalytic converter for a 2008 Honda Civic (1.8L) and $800–$1,400 for a CARB-compliant unit; genuine Honda OEM parts typically run $1,200–$2,300 or more. Installed totals at a shop usually land between $500 and $3,000 depending on engine (LX/EX 1.8L, Si 2.0L, or Hybrid), which converter is being replaced (manifold/primary vs. underfloor/secondary), emissions requirements in your state, and labor rates.

What You’ll Pay for the Part

Pricing varies widely based on whether you buy an OEM Honda converter or an aftermarket one, and whether you need a CARB-compliant unit (required in states like California, New York, Colorado, and Maine). The 2008 Civic may have two converters: a primary (often integrated with the exhaust manifold) and, on many trims, a secondary underfloor converter. The primary is typically the expensive one.

Below is a realistic 2025 market snapshot by model/trim and emissions specification; ranges reflect common retail pricing from national parts sellers and dealers:

• 1.8L (LX/EX and similar) — primary/manifold catalytic converter:
  

  • Aftermarket, EPA-compliant: about $200–$450
  • Aftermarket, CARB-compliant: about $800–$1,200
  • OEM Honda: about $1,200–$1,900

• 1.8L (LX/EX) — secondary/underfloor converter (if equipped):
  

  • Aftermarket, EPA-compliant: about $120–$300
  • OEM Honda: about $400–$900

• Si (2.0L K20) — primary converter in header assembly:
  

  • Aftermarket, EPA-compliant: about $350–$700
  • Aftermarket, CARB-compliant: about $900–$1,400
  • OEM Honda: about $1,400–$2,400

• Hybrid — specialized converter:
  

  • Aftermarket (availability varies; CARB-compliant options cost more): about $700–$1,500
  • OEM Honda: about $1,800–$3,000

These figures cover the converter assemblies only. Prices are influenced by precious-metal markets (platinum, palladium, rhodium), availability, and state emissions rules; expect higher prices in CARB states and for Si/Hybrid applications.

Installed Cost at a Shop

Labor for a Civic converter swap typically ranges from 1.0 to 2.5 hours, depending on rust, seized hardware, and whether the converter is integrated with the manifold. Labor rates vary by region, often $100–$200 per hour, with dealers on the higher end. Shops also add gaskets, hardware, and sometimes oxygen sensors if they’re aged or seized.

Here’s how the installed total usually breaks down:

• Converter assembly: $120–$3,000 (see ranges above by model/spec)
• Labor: roughly $120–$500 (about 1.0–2.5 hours at typical rates)
• Gaskets, hardware, hangers: about $15–$60
• O2 sensors (if needed): about $80–$250 each
• Taxes/fees and possible core charges: about $0–$200

In practice, a straightforward EPA-compliant aftermarket replacement on a standard 1.8L can come in near $500–$1,200 installed; CARB-compliant jobs and OEM parts often push totals into the $1,200–$2,600 range, and Hybrid or Si applications can reach $1,800–$3,000+ depending on parts choice and condition.

How to Know Which Converter You Need

Check the under-hood emissions label and your registration state. If you live in California, New York, Colorado, or Maine, you generally must install a CARB-approved converter with an Executive Order (EO) number that specifically lists your vehicle. Some other jurisdictions follow similar rules—always confirm with your state DMV or inspection authority. Also verify whether your Civic has both a primary (manifold) and a secondary converter, and identify your engine (1.8L LX/EX, 2.0L Si, or Hybrid), as fitment and cost differ.

Where to Buy and Typical Brands

You can source converters from Honda dealers (OEM), national parts retailers, reputable online sellers, and exhaust shops. Well-known aftermarket brands include Walker, MagnaFlow, Bosal, Davico, Eastern Catalytic, and AP Exhaust. For CARB states, ensure the converter has the correct EO label and that the part number matches your exact year/engine/vehicle configuration.

Tips to Save and Avoid Pitfalls

Targeted steps can reduce cost without risking a comeback or failing inspection. Consider the following before you buy:

1. Confirm the diagnosis: rule out misfires, oil/coolant burning, or exhaust leaks that can mimic converter failure.
2. Verify emissions requirements: buying a non-CARB unit in a CARB state will likely fail inspection.
3. Choose direct-fit over universal when possible to avoid extra labor and fitment issues.
4. Ask shops to reuse healthy O2 sensors; replace only if aged or damaged.
5. Compare quotes from an independent shop and the dealer; labor rates vary widely.
6. Check warranties: reputable aftermarket cats often carry 2–5 years coverage; verify any CARB labeling requirements.
7. Return the core promptly if applicable to recover deposits, and keep receipts for inspection records.
8. Install an anti-theft shield if converter theft is a concern in your area.

Following these steps helps ensure you get a compliant, durable fix at a fair price while avoiding rework and inspection issues.

Theft and Insurance Considerations

While Civics aren’t the top theft targets like some hybrids, converter theft still occurs. Shields or cages deter theft, and etching a serial or VIN fragment can help recovery. Comprehensive auto insurance typically covers catalytic converter theft, subject to your deductible—ask your insurer how a claim would affect your premium and whether they require OEM or will approve aftermarket replacements.

Warranty and Emissions Law

The federal emissions warranty of 8 years/80,000 miles for catalytic converters has long expired for a 2008 model. Aftermarket warranties and state requirements now dictate coverage and compliance. In CARB states, inspectors look for the proper EO label on the converter; keep your invoice and the EO documentation. After installation, ensure there are no check-engine lights and that OBD-II readiness monitors set before your inspection.

Bottom Line

For a 2008 Honda Civic, the catalytic converter itself can cost anywhere from about $200 (basic EPA aftermarket secondary unit) to over $2,000 (OEM primary or Hybrid), with installed totals commonly $500–$2,600 and sometimes higher for Si or Hybrid models and in CARB states. Verify your engine, emissions requirement, and which converter has failed to choose the right part at the right price.

Summary

A catalytic converter for a 2008 Honda Civic typically runs $200–$600 for EPA-compliant aftermarket, $800–$1,400 for CARB-compliant, and $1,200–$2,300+ for OEM, with installed totals usually $500–$3,000 depending on trim, state rules, and labor. Confirm your engine and emissions label, compare OEM vs. reputable aftermarket options, and factor in labor, gaskets, and possible O2 sensors to get an accurate estimate.

What are three signs of a bad catalytic converter?

If you notice any of these symptoms, it’s best to take your vehicle to a specialist for inspection.

• Rattling Noise.
• Blue Emissions.
• Reduced Engine Performance.
• Low Gas Mileage.
• “Check Engine” Light Comes On.
• Sulfur Smell from Exhaust.
• Failed Emissions Test.
• The Bottom Line.

How much does a catalytic converter cost for a 2008 Honda Civic?

The average cost for a Honda Civic Catalytic Converter Replacement is between $1,970 and $3,244.

How to cheaply fix a catalytic converter without replacing it?

The cheapest way to address a catalytic converter issue without a full replacement is often to try cleaning it with a specialized cleaner or using a j-pipe (O2 spacer) to temporarily bypass the problem. Catalytic converter cleaners can help remove built-up deposits, potentially restoring some functionality. A j-pipe, installed on the downstream O2 sensor, can trick the car’s computer into thinking the converter is functioning properly by reducing the amount of exhaust the sensor reads. However, these are often considered temporary fixes and may not be suitable for all situations, especially if your state has emissions testing. 
This video explains how to clean a catalytic converter using a cleaner and fuel additives: 1mAuto V Fix YouTube · Jan 21, 2022
1. Catalytic Converter Cleaning:

• Catalytic Converter Cleaners: . Opens in new tabThese are additives you pour into your fuel tank that are designed to dissolve and remove carbon buildup and other deposits within the catalytic converter. 
• Italian Tune-Up: . Opens in new tabThis involves driving the vehicle harder than usual for a period to increase the catalytic converter’s temperature and burn off deposits. 

This video shows how to clean a catalytic converter using an Italian tune-up and fuel additives: 53sMechanic BaseYouTube · Mar 6, 2025
2. J-Pipe/O2 Spacer:

• Function: J-pipes (also known as O2 spacers) are small, curved pipes that are installed between the downstream O2 sensor and the exhaust pipe. 
• How it works: They create a small gap, reducing the amount of exhaust gases reaching the sensor, which can trick the car’s computer into thinking the converter is working efficiently. 
• Limitations: This is generally considered a workaround for emissions testing purposes and is not a permanent fix. 
• Important Note: Installing a j-pipe or O2 sensor spacer is illegal in many areas for road vehicles and may not be effective if the catalytic converter is severely damaged, according to YouTube videos. 

This video demonstrates how to install a j-pipe (O2 sensor spacer) on a car: 51sFlat Rate MechanicYouTube · Dec 8, 2022
3. Other Considerations:

• Check Engine Light: If the catalytic converter is malfunctioning, it can trigger a “check engine” light. While a j-pipe or cleaning can sometimes clear the light temporarily, it’s important to address the underlying issue. 
• Emissions Testing: If your area requires emissions testing, these temporary fixes may not be sufficient to pass. 
• Professional Advice: It’s always recommended to consult with a mechanic for proper diagnosis and repair of any catalytic converter problems. 

Is it worth fixing a catalytic converter?

Yes, it is usually worth fixing or replacing a catalytic converter to prevent vehicle damage, ensure compliance with emission laws, and avoid fines. However, the economic decision of repairing an old car versus buying a new one is a significant factor, especially if the repair cost is a large percentage of the vehicle’s value. You should weigh the cost of replacement against your car’s current value and the potential for other mechanical problems.
 
Reasons to Fix Your Catalytic Converter

• Prevent Engine Damage: A faulty converter can lead to engine issues, including reduced performance and increased fuel consumption. 
• Comply with Emission Laws: A functioning catalytic converter is crucial for meeting emission standards. 
• Avoid Fines: In states with emissions tests, a bad catalytic converter will cause your car to fail, potentially leading to fines and the inability to register your vehicle. 
• Restore Performance: Replacing a clogged converter restores proper exhaust flow, improving engine efficiency and fuel economy. 

Factors to Consider Before Deciding

• Cost vs. Vehicle Value: Compare the cost of a new catalytic converter and labor against the car’s market value. If the repair cost is close to or exceeds the car’s worth, a new car might be a better investment. 
• Extent of the Damage: Minor damage, like a small crack, might be reparable, but significant damage often requires complete replacement. 
• Underlying Causes: The failure of a catalytic converter can be a symptom of a deeper engine issue, such as misfires or incorrect fuel mixtures. You must fix the root cause to prevent another converter from failing. 
• Your Location’s Laws: Research your state’s specific emissions testing requirements and the consequences of failing them. 
• Labor Costs: The part itself is expensive, but installation costs add to the overall price. If you’re comfortable with DIY work, replacing the converter yourself can save on labor.