Which risk increases significantly when direct fuel injectors in an engine exhibit excessive leakage post-combustion?

💡 Explanation

When direct fuel injectors leak post-combustion, raw fuel enters the exhaust stream because the injector nozzle fails to seal properly, leading to excessive unburnt hydrocarbons reaching and damaging the catalytic converter. Therefore premature catalytic converter failure is likely, rather than hot-spots, bearing wear or vibration which involve other engine subsystems.

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