The replacement typically costs about $800 to $2,500, depending on engine type, year, and whether you use aftermarket or OEM parts, and whether one or two converters must be replaced.
Cost landscape by setup
Prices vary based on how many catalytic converters are involved and which parts you choose. The scenarios below are common for Altima models.
- Aftermarket replacement (one converter): Parts roughly $150–$500; labor $100–$300; total about $350–$800.
- OEM replacement (one converter): Parts roughly $600–$1,500; labor $100–$300; total about $700–$1,800.
- Aftermarket replacement (two converters): Parts roughly $700–$1,800 total; labor $250–$500; total about $950–$2,300.
- OEM replacement (two converters): Parts roughly $1,400–$3,000 total; labor $400–$900; total about $1,800–$3,900.
Prices can vary by region, shop, and whether the car needs sensors or additional gaskets. The figures above reflect typical ranges from independent shops and dealerships as of 2024–2025.
What determines the total cost
Several factors influence the final bill beyond the base price of the converter(s). Engine configuration, the number of converters, labor rates in your area, and whether O2 sensors or other components must be replaced all shift the total.
- Engine type and model year (2.5L four-cylinder vs. V6; presence of dual cats).
- Number of catalytic converters required (one vs. two).
- Parts choice (aftermarket vs. dealer/OEM).
- Labor rates and estimated time to access the exhaust system.
- Additional parts or services (O2 sensors, gaskets, clamps).
Understanding these factors helps you compare quotes and plan for the total expense.
Warranty and coverage considerations
Catalytic converters are covered under emissions warranties for many vehicles. In the United States, the federal emissions warranty typically covers the catalytic converter for up to 8 years or 80,000 miles, whichever comes first, with some states offering longer protections. If your Altima is still within the warranty window and the failure is due to a warranted defect, replacement may be covered. Always check your vehicle’s warranty status and the specific terms with your dealership or mechanic.
What to ask your shop to save money
When shopping for quotes, asking the right questions can help you trim costs without sacrificing quality.
- Do you quote parts as aftermarket or OEM, and is the labor estimate the same for both?
- Will you replace just the failing bank or both catalytic converters if needed?
- Are oxygen sensors, gaskets, and clamps included in the labor?
- Do you offer a warranty on parts and labor, and what does it cover?
Getting multiple written estimates and clarifying what’s included can prevent surprises at the counter.
Summary
For a Nissan Altima, replacing the catalytic converter typically costs between $800 and $2,500, with lower-end costs tied to aftermarket single-cat replacements and higher-end costs tied to OEM and dual-cat replacements. The exact price hinges on engine configuration, the number of converters, and the shop’s rates. Planning ahead, verifying warranty coverage, and requesting detailed quotes can help you navigate the repair confidently.
How much is it to fix a catalytic converter on a Nissan Altima?
between $1,498 and $1,850
The average cost for a Nissan Altima Catalytic Converter Replacement is between $1,498 and $1,850. Labor costs are estimated between $204 and $300 while parts are priced between $1,294 and $1,551.
What is the most common problem with Nissan Altima?
The Continuously Variable Transmission (CVT) remains the Altima's Achilles' heel in 2026. Despite improvements in recent models, 2013-2018 Altimas continue experiencing catastrophic CVT failures, now averaging 87,000 miles according to NHTSA data.
Can you drive a Nissan Altima without a catalytic converter?
You can technically drive without a catalytic converter, but doing so would be illegal. If your catalytic converter has been stolen, you'll probably notice because your engine will be much louder while idling. Driving without a catalytic converter won't compromise your safety, but you will be at risk of being fined.
Is it worth replacing a bad catalytic converter?
Additionally, driving without one can be dangerous because your vehicle won't accelerate properly. You may also notice that your car has lesser power in lower gears. Therefore, replacing the catalytic converter is important and should not be delayed.