P0430high severityPowertrain
Catalyst System Efficiency Below Threshold Bank 2
on 2009 Mazda MX-5 Miata 2.0L I4 · RWD
What this code means
The Bank 2 catalytic converter is not performing efficiently. Same as P0420 but for Bank 2.
Symptoms
- Check Engine Light
- Failed emissions test
- Possible sulfur smell
Common causes
- Worn catalytic converter
- Exhaust leak near downstream O2
- Faulty O2 sensor Bank 2
- Misfire damage to catalyst
- Oil contamination
Diagnostic steps
- Compare upstream/downstream O2 waveforms Bank 2
- Check for exhaust leaks
- Test downstream O2 sensor Bank 2
- Check for misfire codes
- Inspect for oil consumption
Repair notes
Same approach as P0420 but for Bank 2. Replace catalyst if confirmed failed.
Other Powertrain codes on this vehicle
P0001
Fuel Volume Regulator Control Circuit/Open
P0002
Fuel Volume Regulator Control Circuit Range/Performance
P0003
Fuel Volume Regulator Control Circuit Low
P0004
Fuel Volume Regulator Control Circuit High
P0010
Intake Camshaft Position Actuator Circuit/Open Bank 1
P0011
Intake Camshaft Position Timing Over-Advanced Bank 1
P0012
Intake Camshaft Position Timing Over-Retarded Bank 1
P0013
Exhaust Camshaft Position Actuator Circuit/Open Bank 1
P0014
Exhaust Camshaft Position Timing Over-Advanced Bank 1
P0015
Exhaust Camshaft Position Timing Over-Retarded Bank 1