---
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.castlesubarumchenry.com"
tags: ["service", "diagnostics", "check-engine", "warning lights"]
questions:
  - "What does a check-engine light mean?"
  - "How do you diagnose check-engine problems?"
  - "What's the cost of a diagnostic?"
related: [service-routine-maintenance, service-battery-electrical, service-recalls]
dealer: Castle Subaru McHenry
---

A check-engine light can mean many things-from a loose gas cap to a sensor issue to an emissions problem. It's worth taking seriously, but it's not always an emergency.

**What we do:** Our technicians use advanced diagnostic equipment to read the trouble code stored in your engine computer, pinpoint the source, and recommend the right fix. It might be a simple sensor replacement, a fluid top-up, or something more involved-we'll explain clearly.

**Next steps:** Bring your car in as soon as it's convenient. The sooner we diagnose, the sooner you're safe and confident again. Ignoring it can lead to larger problems, so don't delay.

Ready to get answers? Call (779) 601-0797 or schedule service online at https://www.castlesubarumchenry.com.