Frequently Asked Questions

What does it mean when the check engine light comes on in a 2018 Hyundai Sonata?

• It indicates the vehicle's onboard diagnostics detected a fault—anything from a loose gas cap to emissions, fuel, ignition, or sensor issues.
• At Larry H. Miller Hyundai Peoria we use factory-grade scanners and certified technicians to quickly identify the exact code and recommend repairs that save you money now and over time.
• We often cost less than independent shops while providing OEM parts, warranty protection, and transparent estimates—repairs covered under warranty must be performed at a certified dealership.
• We offer service financing so you can get service now and pay later; to arrange repairs, please schedule service online.

How long does a check engine light service take?

• Diagnostic scans typically take 30–60 minutes; many common repairs can be completed the same day depending on parts availability.
• Larry H. Miller Hyundai Peoria emphasizes fast turnaround with OEM parts and factory-trained techs—this minimizes downtime and extends vehicle life.
• Check our service specials for bundled offers that reduce overall cost and increase long-term savings.
• To get a precise window, schedule appointment and we’ll prioritize your vehicle.

How much does a check engine light diagnostic cost for a 2018 Hyundai Sonata?

• Diagnostic pricing varies by issue, but Larry H. Miller Hyundai Peoria frequently offers competitive rates that can beat independent shops when you factor in warranty and OEM parts value.
• Our transparent estimates show immediate and long-term savings—accurate diagnostics prevent unnecessary repairs and costly repeat visits.
• Ask about service financing to handle costs today and pay over time, and check current service specials for discounts.

What is the most common reason for check engine light on a 2018 Hyundai Sonata?

• Common causes include a faulty oxygen sensor, catalytic converter issues, loose/faulty gas cap, or misfires from ignition components.
• Left unaddressed, these can reduce fuel economy, increase emissions, and lead to more expensive repairs; our certified techs diagnose quickly to protect performance and resale value.
• Repairs under warranty must be done at a certified dealership—our team will explain coverage and options clearly.

What is the first thing to check when the check engine light comes on?

• Start with obvious checks: ensure the gas cap is tight—this simple step often clears the light after a few drive cycles.
• If the light persists or flashes, bring your 2018 Hyundai Sonata to Larry H. Miller Hyundai Peoria for a full scan; flashing lights can indicate more serious problems needing immediate attention.
• To get prompt diagnosis and avoid escalation, schedule service online or contact our service team—ask about financing if needed.