P0430: Catalyst System Efficiency Below Threshold (Bank 2)
Same as P0420 but on bank 2 of a V6 or V8.
Green, yellow, red: three ways P0430 can look
The same code can be a quick fix or a reason to pull over. Match your situation to the closest example.
Keep an eye on it
Light on, runs normally.
Schedule a repair
Smell, rattle, or inspection due. Get it diagnosed.
Stop and get help
With misfires or a flashing light. Stop driving.
Symptoms you might notice
- Usually no driving symptoms
- Failed emissions inspection
Common causes, cheapest first
- Aging catalytic converter
- Exhaust leak
- Faulty downstream O2 sensor
- Misfire or oil burning
What you can check before calling
- Look for exhaust leaks
- Check for misfire codes
A code points to a system, not a part. Replacing parts based on the code alone is how people spend money without fixing the problem. Testing confirms the cause first.
Want the full story? Read our guide: P0420: is your catalytic converter really bad?.
Generic codes (second character 0) mean the same thing on every vehicle. Some manufacturers add their own details, so check service information for your exact vehicle.
Look up another code
Cummins fault code (like 1922), J1939 SPN and FMI (like SPN 3251 FMI 0), or an OBD-II code (like P0420).
Questions
What does P0430 mean?
P0430 means "Catalyst System Efficiency Below Threshold (Bank 2)". Same as P0420 but on bank 2 of a V6 or V8.
Can I drive with code P0430?
It depends on what the vehicle is doing. Green: Light on, runs normally. Yellow: Smell, rattle, or inspection due. Get it diagnosed. Red: With misfires or a flashing light. Stop driving.
What causes P0430?
The most common causes are: aging catalytic converter; exhaust leak; faulty downstream O2 sensor.
Is P0430 a serious code?
It can be. With misfires or a flashing light. Stop driving.
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