P0430
Catalyst System Efficiency Below Threshold Bank 2
1999-2000 BMW 323i E46 2.5L I6 🇩🇪
High SeverityPowertrain
Description
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.
Related Codes
Other Powertrain Codes
- P0001Fuel Volume Regulator Control Circuit/Open
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0003Fuel Volume Regulator Control Circuit Low
- P0004Fuel Volume Regulator Control Circuit High
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
- P0011Intake Camshaft Position Timing Over-Advanced Bank 1
- P0012Intake Camshaft Position Timing Over-Retarded Bank 1
- P0013Exhaust Camshaft Position Actuator Circuit/Open Bank 1
- P0014Exhaust Camshaft Position Timing Over-Advanced Bank 1
- P0015Exhaust Camshaft Position Timing Over-Retarded Bank 1
P0430 on Other Vehicles
Common Questions
What does code P0430 mean on a 1999-2000 BMW 323i E46?
P0430 stands for "Catalyst System Efficiency Below Threshold Bank 2". The Bank 2 catalytic converter is not performing efficiently. Same as P0420 but for Bank 2.
What are the symptoms of P0430 on a BMW 323i E46?
Common symptoms of P0430 include: Check Engine Light, Failed emissions test, Possible sulfur smell.
What causes P0430 on a 1999-2000 BMW 323i E46?
Common causes of P0430 include: Worn catalytic converter, Exhaust leak near downstream O2, Faulty O2 sensor Bank 2, Misfire damage to catalyst, Oil contamination.