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p0430
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BMW · SUVs
Catalyst System Efficiency Below Threshold Bank 2
Quick Answer
Error code P0430 on your BMW 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
X1 M35i 2024X1 xDrive28i 2024X3 M 2024X3 M40i 2024X3 xDrive30i 2024X5 M 2024X5 M60i 2024X5 xDrive40i 2024X5 xDrive50e 2024X6 M 2024X6 M60i 2024X6 xDrive40i 2024X7 M60i 2024X7 xDrive40i 2024iX M60 2024iX xDrive50 2024X1X3 MX3X5 MX5X6X7iX
Likely Causes
  1. Failed catalytic converter on bank 2
  2. Faulty downstream oxygen sensor on bank 2
  3. Exhaust leak near the bank 2 catalytic converter
  4. Prolonged rich or lean running condition damaging bank 2 catalyst
  5. Contaminated catalyst from coolant or oil leak
How to Fix It
1
Check for additional trouble codes affecting bank 2 fuel delivery
2
Monitor bank 2 downstream O2 sensor switching rate and amplitude
3
Inspect bank 2 exhaust components for leaks
4
Measure temperature differential across the bank 2 catalytic converter
5
Replace the bank 2 catalytic converter and downstream O2 sensor if needed
Pro Tip
This issue typically requires professional diagnosis. Attempting this fix without proper training could cause further problems.
Parts You May Need
Catalytic converter (bank 2)
Downstream oxygen sensor (bank 2)
Exhaust gaskets
Exhaust mounting hardware
Related Error Codes
P0171P0174P0300P0301P0335
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