Repair Cost Guide

Catalytic converter replacement cost
for a Mazda 3

Replacing the catalytic converter on a Mazda 3 involves removing the old unit from the exhaust system and installing a new one. The primary cost driver is the price of the converter itself, which varies drastically between OEM and aftermarket parts, with labour for access and installation being a significant secondary factor.

$850 – $2200
Typical fair price range · USD

Cost breakdown

Parts: ~$400-$1600 / Labour: ~$200-$400

What affects the price

OEM vs. aftermarket/certified universal converter price
Model year and engine size affecting part complexity and cost
Regional labour rates and whether other exhaust components need replacement

Can you do it yourself?

Possible with skill — requires proper jacking, penetrating oil, and exhaust tools, but oxygen sensor and manifold bolts can be challenging.

Tips before you pay

Verify the exact part number, as converters differ between 2.0L and 2.5L engines and model years.
Consider a CARB-compliant or EPA-certified aftermarket unit if local regulations allow, for significant savings.
Inspect the exhaust manifold and oxygen sensors while the converter is off, as they are common failure points.

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More cost guides

Brake pads replacement — Mazda 3 Alternator replacement — Mazda 3 Timing belt replacement — Mazda 3

Estimate based on typical U.S. market rates as of July 2026. Actual prices vary by region, shop, and parts quality — always compare against a real quote using our Scam Checker.