Typically, you should budget about $1,000 to $2,500 for a catalytic converter replacement on an Audi S4, with higher quotes if two converters must be replaced or OEM parts are used. Regional labor rates and the specific engine layout by generation heavily influence the final price.
The Audi S4’s exhaust setup varies by generation, with some models using one catalytic converter and others employing two. The job includes parts and labor to remove the old unit, install the new one, and potentially replace sensors, gaskets, and clamps. Because prices differ by region and by whether you choose OEM or aftermarket parts, you should expect a broad range and to obtain written estimates before approving work.
What determines the price
Several factors determine the total cost of replacing a catalytic converter on an Audi S4. The following outlines the main drivers you’ll encounter when you receive quotes.
Typical cost scenarios
Before the list, note that the ranges below reflect common configurations encountered on Audi S4 models and illustrate how part choice impacts the final bill.
- Single catalytic converter replacement (aftermarket parts): 700–1,600 total
- Single catalytic converter replacement (OEM parts): 1,000–2,000 total
- Dual catalytic converters replacement (both cats, aftermarket parts): 1,400–3,000 total
- Dual catalytic converters replacement (both cats, OEM parts): 2,000–4,000+ total
Concluding: The number of catalytic converters and the choice between aftermarket and OEM parts are the biggest price levers.
Other cost considerations
Before the list, consider additional elements that can affect the final quote beyond the cat(s) themselves.
- Labor rates and time: regional shop rates and how long the job takes (typical access/installation time ranges from 1.5 to 4 hours).
- Taxes, disposal fees, and emissions-related charges may add a modest amount to the bill depending on your location.
- Related components: oxygen sensors, flanges, gaskets, and clamps may need replacement, adding to cost.
- Vehicle configuration: different S4 generations (engine layout) change access and part availability, influencing price.
Concluding: A final estimate should itemize parts, labor, and any ancillary components to avoid surprises.
Ways to save on the repair
Before the list, these strategies can help you control the price while maintaining proper repair quality.
- Shop around for quotes from multiple independent shops and dealers to compare prices and warranties.
- Ask about aftermarket catalytic converters with warranty and confirm emissions compliance in your state or country.
- Request a diagnostic first to confirm whether the cat itself is failing or if a sensor or exhaust issue is triggering the problem.
Concluding: A careful diagnostic and a few price checks can prevent overpaying and ensure you get a compliant, durable repair.
Summary
Replacing a catalytic converter on an Audi S4 is a substantial repair with typical total costs ranging from approximately $1,000 to $4,000+, depending on whether you replace one or both converters and whether you use aftermarket or OEM parts. Labor rates, regional differences, and the specific exhaust layout by model year are major factors shaping the final quote. Always obtain a detailed, line-item estimate and verify emissions compliance when selecting parts.