Frequently Asked Questions

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

• Loose or faulty gas cap causing an evaporative emissions fault and triggered code.
• Oxygen sensor or catalytic converter issues that reduce fuel economy and raise emissions.
• Engine misfires from spark or fuel delivery problems; can damage the catalytic converter if ignored.
• Vacuum leaks or mass airflow sensor faults causing a lean condition and drivability issues.
• Prompt diagnosis at our dealership prevents small issues from becoming costly repairs and preserves warranty coverage.

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

• It indicates the vehicle’s onboard diagnostics (OBD-II) detected a system fault—ranging from minor emissions issues to engine misfires.
• Codes point to subsystems (evap, ignition, fuel, emissions); a precise scan reveals the root cause.
• Some faults are immediate safety concerns; others affect efficiency and emissions without immediate drivability changes.
• Our factory-trained technicians use Toyota-specific scanners to identify whether a simple fix or advanced repair is required.
• Warranty-covered repairs must be completed at a certified dealership to protect your coverage and long-term value.

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

• Check the gas cap: ensure it’s tight and undamaged—this simple step resolves many evaporative system codes.
• Note any changes: unusual noises, loss of power, smoke, or fuel smell—these signal urgent attention.
• Look at dashboard indicators—if the light is flashing, stop driving and contact service immediately.
• Record recent maintenance or fill-ups to help technicians reproduce or identify issues quickly.
• If under warranty, bring the vehicle to our dealership so repairs remain covered and performed by certified technicians.

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

• Diagnostic scans typically range from a modest fee to a standard diagnostic charge; exact pricing depends on inspection depth and tests required.
• Our dealership often costs less than independent shops while providing factory-trained technicians, genuine parts, and documented repairs.
• Choosing Nalley Toyota of Roswell delivers immediate savings through accurate diagnosis and long-term savings by preventing misdiagnosis and repeat repairs.
• If a repair is covered under warranty, it must be completed at a certified dealership to maintain coverage—our service team handles that process for you.
• We provide transparent estimates before work begins and offer service specials to reduce out-of-pocket expense; see our Service Specials for details.

How long does a check engine light service take?

• Simple code scans and inspections can take 30–60 minutes; complex diagnostics or repairs may require several hours or scheduled appointments.
• Our technicians use Toyota-specific tools for efficient troubleshooting, minimizing time in the shop while ensuring accurate results.
• If parts are required, we source genuine Toyota components quickly to reduce downtime and protect long-term reliability.
• Warranty-related work must be done at a certified dealership; we streamline authorization and repairs to save you time and money.
• Schedule service online or visit our Service Specials page to find ways we can further reduce cost and turnaround time.