Frequently Asked Questions

What is the most common reason for check engine light on a 2010 Hyundai Sonata?

• Loose or damaged gas cap causing an EVAP leak is one of the simplest, most frequent causes.
• O2 sensor failures and catalytic converter issues are common as the vehicle ages and affect emissions and fuel economy.
• Spark plug or ignition coil problems (misfires) trigger codes that reduce performance and can damage the catalytic converter if left unchecked.
• Addressing these issues at Nalley Hyundai often costs less than independent shops, with immediate savings on parts and long-term savings from preventing bigger repairs.
• Warranty-covered repairs must be completed at a certified dealership to preserve coverage and ensure proper parts and labor documentation.

What does it mean when the check engine light comes on in a 2010 Hyundai Sonata?

• It indicates the vehicle’s onboard diagnostics (OBD-II) has detected a system fault that affects emissions, engine performance, or fuel delivery.
• Codes can range from simple (loose gas cap, EVAP leaks) to serious (misfires, catalytic converter failures).
• Some faults are non-urgent, while others require immediate attention—our factory-trained technicians interpret codes and recommend the right action.
• Using Nalley Hyundai for diagnostics often delivers better value and warranty protection; warranty repairs must be done at a certified dealership.

How much does a check engine light diagnostic cost for a 2010 Hyundai Sonata?

• Diagnostic fees vary, but expect a professional scan and inspection at Nalley Hyundai to fall within a competitive range; diagnostics are often offset by repair savings when completed with us.
• Many customers find our pricing delivers immediate savings versus independent shops, thanks to OEM parts access and efficient repairs by factory-trained technicians.
• If a repair is needed and covered under warranty, it must be performed at a certified dealership to retain coverage and proper documentation.
• We provide clear estimates and explain long-term savings from addressing issues early to avoid costly downstream repairs.

How long does a check engine light service take?

• Typical diagnostics and a basic inspection usually take 30–90 minutes depending on the issue and vehicle condition.
• If repairs are required, time varies: simple fixes (tightening gas cap, replacing a sensor) can be same-day, while more complex repairs may take longer.
• Nalley Hyundai’s service team uses efficient processes and OEM parts to minimize downtime and often completes repairs faster than independent shops.
• For warranty repairs, scheduling at a certified dealership ensures proper parts, documented service, and preservation of warranty benefits.

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

• Start with the basics: ensure the gas cap is tightened; a loose cap is a frequent and simple cause.
• Note any changes in performance, noises, or odor—this helps our technicians prioritize diagnostics.
• Bring the vehicle to Nalley Hyundai or schedule service online; our team will scan codes and provide a clear plan for repair and cost.
• Remember: warranty-covered repairs must be completed at a certified dealership to maintain coverage and to benefit from factory-trained technicians and OEM parts.