What does code P0430 mean on a Mazda and is it safe to drive?
P0430: Catalyst System Efficiency Below Threshold (Bank 2). Here's what it means on your Mazda, what usually causes it, what repairs typically cost, and how safe it is to keep driving.
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What this code means
Same as P0420 but for bank 2. The catalytic converter on bank 2 is not operating efficiently.
Common causes for your Mazda
- Failed catalytic converter (bank 2)
- Faulty O2 sensor(s)
- Exhaust leak
Symptoms
- Check Engine Light
- May fail emissions
Typical fixes
- Replace bank 2 catalytic converter
- Replace oxygen sensors
- Repair exhaust leaks
Repair cost range
For a Mazda, repairs for P0430 often fall between $400 and $2400, depending on the cause and whether you use OEM or aftermarket parts. Labor rates vary by location.
Known issues on Mazda
Mazda P0430 appears on V6 models (2.3L Duratec-based and 3.7L V6 in CX-9) alongside P0420. On CX-9, both catalysts are accessible from underneath; test both downstream O2 sensors before purchasing converters.
Most commonly affected models
Mazda6 V6 2003–2008CX-9 2007–2015Mazda MPV 2000–2006