BMW 3 Series Coupe Catalytic converter replacement Cost
2003–2006 · Engine, Fuel & Emissions system
Typical range
$690–$11.4k
Parts + labour
Labour hours
1–6h
At a typical garage
The catalytic converter reduces harmful exhaust gases by converting them to less toxic compounds. A failing cat triggers a P0420 check engine light, may produce a sulphur smell and can reduce engine power. BMW 3 Series Coupe catalytic converter replacement costs $690–$11430—one of the more expensive emission-related repairs.
Typical parts included
- Catalytic converter
What affects the price
- OEM vs direct-fit aftermarket vs universal (OEM recommended for emissions compliance)
- Whether the vehicle has multiple catalytic converters (common on V6/V8)
- Whether upstream oxygen sensors need replacing at the same time
Common questions
How long does this repair take?
Catalytic converter replacement on a BMW 3 Series Coupe typically takes 1–6 hours at a garage.
How often does this need to be done?
For a BMW 3 Series Coupe, this is typically needed catalytic converters are replaced on failure; typical lifespan is 100,000–150,000 miles with good maintenance.
Other engine, fuel & emissions system repairs on the BMW 3 Series Coupe
- ABS hydraulic unit replacement$425–$765
- ABS sensor replacement$175–$315
- ABS system bleeding$140–$252
- AC compressor clutch replacement$350–$630
- AC compressor replacement$375–$675
Catalytic converter replacement cost on similar cars
- MERCEDES BENZ E-Klasse Coupe and predecessors$350–$630
- AUDI A5$350–$630
- SAAB 9-3 Coupe$350–$630
- PORSCHE 911 Carrera 4$385–$693
- FORD Mustang$347–$635
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