p0430
Moderate
Cadillac · Sedans
Catalyst System Efficiency Below Threshold (Bank 2)
Quick Answer
Error code P0430 on your Cadillac Sedans means: Catalyst System Efficiency Below Threshold (Bank 2). This is usually fixable — see the step-by-step guide below.
Affected Models
Likely Causes
How to Fix It
1
Check oxygen sensors on bank 2
2
Inspect exhaust system integrity
3
Verify engine fuel trim and ignition timing
4
Test catalytic converter efficiency
5
Replace converter if necessary
Pro Tip
This fix requires some technical knowledge. If you're unsure about any step, consider contacting support or a qualified technician.
Parts You May Need
Catalytic converter
Oxygen sensors
Exhaust gasket
O2 sensor socket
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