---
id: department-0012
title: "What should I do if my check-engine light comes on or I'm having a problem?"
category: department
subtopic: service-diagnostics
page_type: department
source_url: "https://www.castlevwcars.com"
tags: ["service", "diagnostics", "check-engine light", "troubleshooting"]
questions:
  - "My check-engine light is on-what do I do?"
  - "Can you diagnose car problems?"
  - "What does a diagnostic cost?"
  - "Why is my car making a weird noise?"
related: [service-maintenance-overview, service-recalls]
dealer: Castle Volkswagen of Schaumburg
---

A check-engine light or any unusual symptom shouldn't be ignored. Our service team uses advanced diagnostic equipment to read your vehicle's computer codes and pinpoint the exact issue-whether it's something minor (loose gas cap) or more serious.

Diagnostics help us fix the real problem, not just a symptom, and often save you money by preventing larger repairs down the road. We'll explain what we find and your repair options in plain terms.

If your check-engine light is on, you hear strange noises, or you notice any performance changes, call (847) 593-4700 to schedule a diagnostic. Our technicians will get to the bottom of it quickly and keep your Volkswagen running smoothly.