Frequently Asked Questions

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

• Loose or damaged gas cap — the simplest and most frequent trigger for an emissions-related fault.
• Oxygen sensor or EVAP system faults — common as vehicles age or after fueling issues.
• Ignition misfires (spark plugs/coils) — can cause intermittent faults and reduced performance.
• Catalytic converter inefficiency — often follows unresolved O2 sensor or misfire problems.
• Bring your Highlander to Nalley Toyota Union City for accurate diagnosis; dealership repairs often cost less than independent shops while providing factory-trained technicians and warranty protection.

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

• It indicates a stored diagnostic trouble code (DTC) from the vehicle’s onboard systems.
• Codes range from minor emissions issues to conditions that affect drivability or safety.
• A steady light usually signals a non-emergency fault; flashing indicates a serious condition that needs immediate attention.
• Certified diagnostics at Nalley Toyota Union City use factory-grade scanners to pinpoint the cause and avoid unnecessary repairs.
• Remember: warranty-covered repairs must be completed at a certified dealership to preserve coverage and long-term savings.

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

• Confirm the gas cap is tight and undamaged — a quick fix that clears many EVAP codes.
• Note any changes in performance: rough idle, stalling, loss of power, or abnormal noises.
• Check for visible fuel smells or smoke; if present, stop driving and call for assistance.
• For any persistent or unclear symptoms, schedule a dealer inspection — certified service prevents misdiagnosis and protects warranty benefits.
• Nalley Toyota Union City prioritizes accurate diagnostics, OEM parts, and factory-trained techs for immediate and long-term savings.

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

• Diagnostic fees vary based on the depth of testing; a basic OBD-II scan is typically modest, while in-depth diagnostics may cost more.
• Nalley Toyota Union City often provides better value than independent shops by combining efficient diagnostics with factory parts and accurate fixes.
• Immediate savings come from precise diagnosis that avoids unnecessary parts; long-term savings come from warranty protection and correct repairs the first time.
• If repairs are covered under warranty, they must be performed at a certified dealership to maintain coverage.
• Contact our service department for current diagnostic pricing and any available service specials.

How long does a check engine light service take?

• Simple scans and minor fixes (like tightening a gas cap or clearing a code) can take 30–60 minutes.
• Actual repair time depends on the root cause: sensor replacements, ignition repairs, or EVAP fixes typically take a few hours.
• Complex issues such as catalytic converter replacement or intermittent misfires may require parts ordering and diagnostic time, extending service to one or more days.
• Nalley Toyota Union City’s factory-trained technicians and parts network help reduce turnaround time and deliver reliable, warranty-backed repairs.
• We provide accurate time estimates after a full diagnostic to maximize immediate and long-term savings for your Highlander.