Which risk increases when a diesel engine's exhaust gas recirculation (EGR) cooler malfunctions and loses cooling capacity?

💡 Explanation

When EGR cooler loses capacity, the intake manifold receives hotter exhaust gas which increases combustion temperatures because less heat is absorbed. This leads to increased NOx formation due to thermal dissociation of nitrogen and oxygen molecules. Therefore, higher NOx emission results, rather than reduced power, lubricant breakdown, or catalyst failure, which stem from other engine problems.

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