p0430
Moderate
Lincoln · SUVs
Catalyst System Efficiency Below Threshold (Bank 2)
Quick Answer
Error code P0430 on your Lincoln SUVs means: Catalyst System Efficiency Below Threshold (Bank 2). This is usually fixable — see the step-by-step guide below.
Affected Models
Applies to all models
Likely Causes
How to Fix It
1
Test Bank 2 oxygen sensors
2
Check exhaust for leaks on Bank 2 side
3
Measure fuel trim on Bank 2
4
Inspect Bank 2 catalytic converter
5
Check for engine misfires on Bank 2 cylinders
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
Bank 2 catalytic converter
Downstream oxygen sensor
Exhaust gasket
Oxygen sensor connector
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