Typically, replacing the catalytic converter on an Infiniti G35 costs roughly $900–$2,800 with aftermarket parts and labor; using OEM parts can bring the total to about $2,000–$5,000, depending on whether the car needs one or two catalytic converters, and local labor rates.
What affects the price
Several factors influence the final bill when replacing the catalytic converter on a G35. The main variables are:
- How many catalytic converters the car requires (many G35 models use two: a front and a rear converter).
- Whether you choose aftermarket/direct-fit parts or OEM factory parts.
- Local labor rates and the shop’s hourly charge.
- Whether additional components must be replaced (O2 sensors, gaskets, clamps, or hardware).
- Vehicle condition and access to the exhaust system (rust or hard-to-reach mounting points can extend labor time).
Bottom line: price variation is driven by converter count, part type, labor market, and any extra parts or labor required during the replacement.
Cost ranges and what you pay for
Here’s how the numbers typically shake out, distinguishing aftermarket versus OEM parts and whether you need one or two converters.
- Aftermarket, two converters: parts roughly $400–$1,800; labor roughly $250–$900; total estimate $650–$2,700.
- Aftermarket, one converter (less common for G35 but possible if only a single unit is replaced): parts roughly $150–$700; labor roughly $150–$500; total $300–$1,200.
- OEM, two converters: parts roughly $1,000–$3,000; labor roughly $250–$1,000; total $1,250–$4,000.
Note: Some quotes may be higher if sensors need replacement or if the exhaust uses specialized clamps or pipework. Prices can vary by region and shop.
Shopping tips and what to expect
To get accurate quotes, consider the following steps:
- Ask for separate line items for parts and labor and confirm how many converters are included in the quote.
- Request both aftermarket and OEM options and compare warranties on parts and labor.
- Choose a reputable shop with exhaust and emissions experience; check for catalytic converter warranties and whether disposal is included.
- Ask about O2 sensor replacement, gaskets, clamps, and any labor required to remove rusted or seized fasteners.
Pro tip: have a professional diagnose the issue to confirm that the catalytic converter is the actual failure, as codes like P0420/P0430 can indicate upstream problems as well.
Additional considerations
Emissions compliance and inspections
Many states require vehicles to meet emissions standards for registration and inspection. Replacing a catalytic converter should restore emissions performance, but ensure the work and parts meet your state’s requirements.
Theft risk and warranties
Catalytic converters are a common theft target. Ask about warranties on both parts and labor, and consider securing the replacement with a warranty-friendly installation and proper identification for retail records.
Summary
For an Infiniti G35, expect a broad price range for catalytic converter replacement. Aftermarket two-converter replacements generally run roughly $650–$2,700, while OEM two-converter replacements can range from about $1,250 to $4,000, with total costs climbing if you need sensors or additional exhaust work. Always obtain multiple quotes, verify number of converters included, and confirm whether OEM or aftermarket parts are used. Planning ahead and understanding what your car needs will help you budget effectively and avoid surprise charges.