Expect a broad price range when replacing the catalytic converters on a Lexus IS 250. In most cases, OEM units from Lexus or a dealer run higher than aftermarket options, and two converters are common on this model, which doubles parts and often labor costs. Overall, plan for roughly $1,400–$2,400 in parts for two OEM cats, or about $600–$1,200 for two aftermarket cats, with additional labor on top.
This article breaks down what influences price, what to expect for OEM versus aftermarket parts, installation costs, and smart ways to shop for a replacement that fits your car and budget. It reflects typical market pricing as of 2024–2026 and can vary by year, region, and emissions requirements.
IS 250 catalytic converter setup
Understanding how many converters your IS 250 has and where they sit helps explain the price differences between parts and labor.
How many converters does the IS 250 have?
Most Lexus IS 250 models equipped with the 2.5-liter V6 use two catalytic converters—one for each bank of the engine. Some configurations may include a pre-cat near the exhaust manifold and a downstream main cat, depending on the year and emissions setup. If the vehicle triggers multiple catalytic-related trouble codes or fails an emissions test, you may need one or both units replaced.
OEM vs aftermarket: cost ranges
Prices vary significantly depending on whether you buy OEM (dealer) parts or aftermarket equivalents, and whether you replace one or both converters.
- OEM catalytic converters: Typically about $700–$1,200 per converter from a dealership or authorized supplier. For two converters, parts alone commonly total around $1,400–$2,400, not including labor.
- Aftermarket catalytic converters: Generally about $300–$600 per converter for direct-fit, CARB-compliant units. For two converters, parts commonly total around $600–$1,200, with installation costs added.
- Used or salvaged converters: Often $150–$400 per converter, depending on condition and compatibility, but with higher uncertainty about performance and emissions readiness.
Concluding paragraph: "When evaluating options, consider CARB status (for California and some other states), fitment, warranty, and the likelihood of passing inspections after replacement."
Labor and installation considerations
Labor costs reflect local shop rates, vehicle accessibility, and whether other exhaust components must be removed or replaced during the process.
- Labor cost range: About $100–$300 per converter at many shops. For two converters, typical labor totals run roughly $200–$600, though extreme cases can be higher if rusted fasteners or sensor issues are involved.
- Additional costs: Gaskets, oxygen sensors, and potential exhaust system disconnects can add time and expense; some jobs require removing the exhaust from the vehicle to access the cats.
- Labor time: Approximately 1–3 hours per converter, depending on the vehicle’s condition and the shop’s approach.
Concluding paragraph: "Ask for a written estimate that breaks out parts, labor, and any ancillary charges, and inquire about warranties on both parts and labor."
Where to buy and how to save
Choosing where to buy can have a big impact on total cost. Consider these common sources and strategies.
- Dealerships: Typically the most expensive option but offers guaranteed fitment and OEM warranty, along with installation services in some locations.
- Auto parts stores and online retailers: NAPA, AutoZone, O'Reilly, RockAuto, and others offer aftermarket direct-fit options with varying warranties; pricing is often lower than dealerships.
- Aftermarket brands: Brands such as MagnaFlow, Walker, Bosal, and Dorman provide direct-fit or CARB-compliant units at lower prices than OEM, but verify the fit and warranty.
- Salvage yards: The cheapest avenue, but with variable condition, uncertain mileage, and potential legal/regulatory concerns; verify compatibility and warranty where possible.
Concluding paragraph: "Shop around, check CARB compliance requirements for your state, compare multiple quotes, and confirm the return policy and warranty terms before purchasing."
Important considerations and tips
Beyond price, a few practical factors can influence your decision and the long-term success of the replacement.
- Emissions compliance: In California and some other states, CARB-certified direct-fit converters are often required; non-CARB units may not pass inspection or could incur penalties.
- Fitment and compatibility: Ensure the part number matches your exact IS 250 year and engine configuration; two-cat setups require replacing both if codes indicate issues on both banks.
- Warranty: OEM parts typically come with longer warranties; aftermarket warranties vary by brand and may cover a different lifespan or mileage.
- Vehicle condition: Rust, seized fasteners, or damaged exhaust hangers can raise labor time and cost.
Concluding paragraph: "By prioritizing fit, compliance, and warranty alongside price, you protect against recurring repairs and inspection failures."
Summary
For a Lexus IS 250, replacing catalytic converters generally involves two units. Parts costs range from about $600–$1,200 per converter for aftermarket options and $700–$1,200 per converter for OEM parts, with two units making the bulk of the expense. Labor typically adds $200–$600 for two converters, depending on local rates and vehicle condition. Salvage parts can lower upfront costs but carry higher risk. California and some other states may require CARB-compliant parts. Always obtain multiple quotes, confirm fitment for your exact year/model, check warranties, and consider the long-term emissions requirements when choosing between OEM and aftermarket parts.