---
id: department-0009
title: "What should I do if my check-engine light comes on?"
category: department
subtopic: service-diagnostics
page_type: department
source_url: "https://www.genesisofdownersgrove.com"
tags: ["service", "diagnostics", "check-engine light"]
questions:
  - "Why is my check-engine light on?"
  - "What does a diagnostic scan tell me?"
  - "How do you find electrical or engine problems?"
related: [service-maintenance-intro, service-battery-electrical]
dealer: Genesis of Downers Grove
---

A check-engine light signals that your vehicle's onboard diagnostic system has detected an issue-it could be minor (a loose gas cap) or more serious (a sensor or emissions component). Don't panic, but don't ignore it either.

Our Service team uses advanced diagnostic scanners to read the fault code, pinpoint the problem, and recommend the right fix. Whether it's a sensor, catalytic converter, spark plug, or other component, we'll explain what's happening and what it costs.

Early diagnosis prevents small problems from becoming expensive repairs. If your check-engine light is on, call (630) 598-9950 right away to schedule a diagnostic appointment. We'll get to the bottom of it quickly.