Frequently Asked Questions

How much does a check engine light diagnostic cost for a 2025 Toyota Grand Highlander?

• Diagnostics at Nalley Toyota of Roswell begin with a computerized scan to read stored codes and live data—this gives a clear scope before any work begins.
• Typical diagnostic fees are competitive; our dealership often costs less than independent shops while providing factory-trained technicians and genuine parts.
• Immediate savings come from accurate diagnosis that prevents unnecessary repairs; long-term savings come from using OEM parts and proper fixes that avoid repeat visits.
• If repairs are covered under warranty, they must be completed at a certified dealership to maintain coverage and ensure parts and labor are handled correctly.

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

• The light indicates the vehicle's computer has detected an issue—codes range from minor sensor faults to engine misfires or emissions system failures.
• Common triggers include oxygen sensor faults, EVAP leaks, ignition misfires, or catalytic converter efficiency problems.
• The severity varies: some issues are informational while others can affect drivability or emissions compliance and should be inspected quickly.
• Bringing the vehicle to Nalley Toyota of Roswell ensures a precise diagnosis by factory-trained technicians and preserves any warranty benefits tied to certified service.

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

• Start with simple checks: ensure the gas cap is tight and in good condition—an EVAP leak from a loose cap is a common cause.
• If the cap is secure and the light persists, schedule a diagnostic—our technicians will scan the 2025 Toyota Grand Highlander for trouble codes and live data.
• We recommend certified dealership service because warranty-covered repairs must be performed at a certified location to retain coverage and guarantee proper parts and procedures.
• Using Nalley Toyota of Roswell often delivers both immediate cost savings and long-term value through accurate repairs and factory-backed service history.

How long does a check engine light service take?

• Most diagnostics take between 30 minutes and 90 minutes depending on code complexity and whether test drives or component checks are required.
• If additional parts or in-depth troubleshooting are needed, our team will provide a clear timeline and estimate before work proceeds.
• Dealer service often shortens total repair time: accurate diagnostics avoid trial-and-error repairs common at less-specialized shops.
• Warranty repairs must be completed at a certified dealership; our factory-trained technicians follow Toyota procedures to restore your vehicle reliably and efficiently.

What is the most common reason for check engine light on a 2025 Toyota Grand Highlander?

• One of the most frequent causes is an emissions-related sensor fault—oxygen sensors and EVAP system leaks are common triggers.
• Ignition misfires from spark plugs or coils and degraded catalytic efficiency are also typical causes that affect performance and fuel economy.
• Addressing the issue quickly at Nalley Toyota of Roswell reduces the risk of costly secondary damage and offers savings versus repeated repairs at independent shops.
• Any repair covered by warranty must be completed at a certified dealership to maintain protection and ensure genuine parts and proper procedures.