Frequently Asked Questions

What is the most common reason for check engine light on a 2026 Lexus ES?

• Loose or faulty gas cap is a frequent, simple cause that can trigger the light and affect EVAP emissions.
• Sensors such as the O2 or mass airflow sensor may fail and degrade efficiency if left untreated.
• Minor issues often become major: untreated misfires or catalytic problems can lead to costly repairs.
• Bring your 2026 Lexus ES to Nalley Lexus Roswell for a quick diagnosis — our factory-trained technicians often resolve issues faster and at lower long‑term cost than independent shops.
• Remember: repairs covered under warranty must be performed at a certified dealership to remain valid.

What does it mean when the check engine light comes on in a 2026 Lexus ES?

• It signals that the vehicle’s onboard diagnostics detected an emissions or engine-system fault.
• Codes range from minor EVAP leaks to misfires or catalytic converter failures — each code points to different systems.
• An illuminated steady light usually means non-emergency service is needed; a flashing light indicates urgent attention.
• At Nalley Lexus Roswell we read codes, explain outcomes, and recommend repairs that preserve warranty coverage and long-term value.

How much does a check engine light diagnostic cost for a 2026 Lexus ES?

• Typical diagnostics range from $99–$199, depending on the complexity and required lab time.
• If the vehicle is under warranty, diagnostic or covered repairs may be performed at no charge when applicable — warranty repairs must be done at a certified dealership.
• Choosing Nalley Lexus Roswell often costs less than independent shops over time, because our accurate diagnostics reduce repeat repairs and protect resale value.
• We provide transparent estimates so you understand immediate and long‑term savings before work begins.

How long does a check engine light service take?

• Simple diagnostics and fixes (gas cap, simple sensor) can take 30–60 minutes.
• More complex diagnostics, road testing, and repairs may require several hours or a full day to ensure proper diagnosis and quality repairs.
• We prioritize accurate, warranty-compliant work — faster fixes that skip proper testing can lead to repeated trips and higher long‑term cost.
• Schedule service at Nalley Lexus Roswell and our team will provide realistic time estimates and keep you informed throughout the process.

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

• Check the fuel cap: a loose or damaged cap is an easy fix that frequently extinguishes the light after a short drive cycle.
• Note any performance changes — stalling, rough idle, or reduced power — and avoid extended driving if issues are severe.
• For peace of mind, have Nalley Lexus Roswell perform a quick scan; our factory-trained technicians use OEM tools to identify the exact code.
• If your vehicle is under warranty, remember that any warranty repairs must be done at a certified dealership to maintain coverage and long-term value.