What could lack of maintenance on an EGR system lead to?

Lack of maintenance on an Exhaust Gas Recirculation (EGR) system can lead to increased nitrogen oxide (NOx) emissions. The EGR system is designed to recirculate a portion of the engine's exhaust gases back into the combustion chamber, which helps lower combustion temperatures and consequently reduces the formation of NOx emissions, a harmful pollutant that contributes to smog and respiratory problems.

When the EGR system is not properly maintained, issues such as carbon buildup, blocked passages, or malfunctioning components can prevent the system from working effectively. This results in insufficient recirculation of exhaust gases, leading to higher combustion temperatures and, consequently, an increase in NOx emissions. Regular maintenance helps ensure that the EGR system functions correctly, contributing to compliance with environmental regulations and improving overall engine performance.

In contrast, improved engine performance, decreased fuel consumption, or enhanced longevity of the engine are not outcomes associated with a poorly maintained EGR system. Instead, neglecting maintenance generally leads to poorer engine performance, increased fuel consumption due to inefficient combustion, and potential engine wear over time.