Frequently Asked Questions

How much does a check engine light diagnostic cost for a 2024 Toyota Grand Highlander?

• Typical diagnostic fees range from about $100–$170 depending on the depth of testing and scan time.
• Nalley Toyota of Roswell often offers competitive pricing and promotions — our pricing can be lower than many independent shops while delivering factory-trained technicians and OEM parts.
• Immediate savings: accurate diagnosis prevents unnecessary repairs; long-term savings come from correct repairs that avoid repeat failures and preserve fuel economy.
• Repairs covered under warranty must be performed at a certified dealership to maintain coverage and ensure parts and labor are handled correctly.
• Check our current offers at Service Specials for diagnostic incentives and bundled pricing.

What is the first thing to check when the check engine light comes on for a 2024 Toyota Grand Highlander?

• Start simple: confirm the gas cap is tightened — a loose cap is a common cause for an evaporative system code.
• Note engine behavior: listen for rough idle, stalling, or unusual noises; a flashing light indicates a serious misfire and needs immediate attention.
• Check basic indicators: oil pressure, coolant temperature, and dashboard warnings; low fluids or overheating may create codes.
• Document recent changes: fuel quality, recent service, or dashboard lights — this helps our technicians diagnose faster and save you money.
• If the light is flashing or performance is affected, stop driving and have Nalley Toyota of Roswell inspect it to protect your engine and warranty coverage.

What does it mean when the check engine light comes on in a 2024 Toyota Grand Highlander?

• The check engine light signals that a monitored emission, engine, or drivetrain parameter is outside normal range — codes are stored in the vehicle’s computer.
• Conditions range from minor (loose gas cap, sensor drift) to serious (misfire, catalytic converter issues). Proper diagnosis identifies root cause and avoids unnecessary repairs.
• Nalley Toyota of Roswell uses OEM diagnostic tools and factory-trained technicians who interpret codes accurately for long-term reliability and cost savings.
• Repairs that are covered under warranty must be performed at a certified dealership to ensure benefits and safeguard future coverage.
• Prompt service reduces risk of secondary damage and preserves fuel economy and resale value.

How long does a check engine light service take for a 2024 Toyota Grand Highlander?

• Diagnostics alone typically take 30–90 minutes depending on code complexity and necessary drive-cycle checks.
• Simple repairs (sensor replacement, tightening fuel cap) may be completed the same day; more involved repairs (catalytic converter, extensive wiring) require additional time for parts and labor.
• Our dealership scheduling and OEM parts availability often reduces wait time and delivers immediate and long-term savings versus repeated independent visits.
• If a warranty repair is needed, having the work done at Nalley Toyota of Roswell ensures proper documentation and coverage processing.
• We’ll provide a clear time estimate when we complete the initial diagnostic so you can plan accordingly.

What is the most common reason for the check engine light on a 2024 Toyota Grand Highlander?

• Common causes include: loose or faulty gas cap, oxygen sensor or catalytic converter issues, and occasional misfires from ignition or fuel delivery problems.
• Evaporative emission system codes from a loose gas cap are inexpensive to fix but should still be verified by a trained technician.
• Addressing the root cause at a certified dealership reduces repeat visits and maximizes long-term savings while preserving your vehicle’s warranty.
• Nalley Toyota of Roswell’s factory-trained technicians use Toyota-specific diagnostics to quickly pinpoint the issue and recommend the most cost-effective repair path.
• Early diagnosis helps avoid expensive secondary damage and maintains vehicle performance and resale value.