Check engine light due to emissions issues

A check engine light related to emissions issues can indicate problems with the catalytic converter, oxygen sensors, EGR valve, fuel system, or EVAP system. Symptoms may include rough idling, poor acceleration, increased fuel consumption, or excessive exhaust smoke. The ECU monitors emissions components and triggers a warning if it detects excessive pollution or a malfunctioning part. Common causes include sensor failures, clogged catalytic converters, EVAP leaks, or excessive carbon buildup. If ignored, unresolved emissions issues can lead to reduced fuel efficiency, failed emissions tests, and potential long-term engine damage. Diagnosing the issue with an OBD scanner helps identify the specific fault. Fixing the problem restores emissions compliance and prevents further performance issues.

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