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I just had oxogen sensors replaced and now the p0430

Vehicle: 08 cadallac cts

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most likely the the catalytic converter on bank 2 is bad, if there is not issues with the engine, and no physical exhaust damage or leaks
 
 
 
Possible causes
- Three way catalyst converter Bank 2
- Exhaust tube
- Intake air leaks
- Fuel injectors may be faulty
- Fuel injector leaks
- Spark plugs may be faulty
- Improper ignition timing
- Powertrain Control Module (PCM)

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