Frequently Asked Questions

How much does a check engine light diagnostic cost for a 2025 Toyota Crown Signia?

• Diagnostics typically include an OBD-II scan, inspection and a clear estimate for repairs.
• At Nalley Toyota of Roswell we offer competitive diagnostic pricing and transparent estimates designed to save you money up front and over time.
• Using our dealership often costs less than independent shops because factory-trained technicians identify root causes faster and avoid unnecessary parts and labor.
• Any repairs covered by warranty must be performed at a certified dealership to maintain coverage and ensure lasting value.

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

• Start with basic checks: confirm the gas cap is secure, and look for any obvious leaks or audible misfires.
• If the gas cap is loose or damaged, tightening or replacing it often clears EVAP-related codes and restores fuel economy.
• For accurate diagnosis and to protect your warranty, bring the vehicle to Nalley Toyota of Roswell where factory tools and trained technicians perform the correct tests.
• Early inspection by our team can prevent small issues from becoming expensive repairs and preserves long-term reliability.

What does it mean when the check engine light comes on in a 2025 Toyota Crown Signia?

• It indicates the vehicle’s onboard computer has detected a fault—anything from an emissions sensor to an ignition or fuel issue.
• Some faults are minor and stored as pending codes; others require immediate attention to avoid damage to components like the catalytic converter.
• Our dealership uses Toyota-specific diagnostics to read codes, test systems, and recommend the most cost-effective repairs.
• Repair work done at a certified dealership protects warranty coverage, delivers better long-term savings, and uses genuine Toyota parts where needed.

What is the most common reason for check engine light on a 2025 Toyota Crown Signia?

• Common causes include oxygen sensor or catalytic efficiency issues, ignition misfires, and EVAP system leaks.
• These issues often start small—reduced fuel economy or rough idle—and grow into costly repairs if ignored.
• Nalley Toyota of Roswell diagnoses the root cause quickly to minimize repair costs and prevent avoidable long-term expenses.
• Remember: warranty-covered repairs must be completed at a certified dealership to remain valid and preserve resale value.

How long does a check engine light service take?

• Simple diagnostics can take 30–60 minutes; more complex inspections or road tests may take longer.
• If a repair is required, our service advisors provide a clear timeline and cost estimate before work begins.
• Because our factory-trained technicians diagnose issues accurately, we often complete repairs faster than independent shops, saving you time and money.
• Performing work at a certified dealership ensures warranty integrity and long-term savings through correct repairs using genuine parts.