Frequently Asked Questions

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

• Check the fuel cap: a loose or damaged cap is the most common simple cause and can often turn the light off after tightening or replacing it.
• Look for other dashboard warnings and note any unusual sounds, smells, or drivability issues to report to technicians.
• If the light is flashing, stop driving and have your vehicle evaluated immediately to avoid engine or catalytic converter damage.
• Bring your 2024 Lexus IS to Nalley Lexus Roswell for a full scan — warranty-covered repairs must be done at a certified dealership to preserve coverage.

How long does a check engine light service take?

• Basic code read and inspection: typically 30–60 minutes, depending on technician findings and vehicle queue.
• Minor repairs (gas cap, sensor swap): often completed the same day, usually 1–3 hours if parts are on hand.
• Complex diagnostics or parts orders may take longer; our service team provides clear timelines and strives for efficient turnaround.
• Using Nalley Lexus Roswell often saves you time and money — we stock OEM parts and our factory-trained techs diagnose correctly the first time.

What does it mean when the check engine light comes on in a 2024 Lexus IS?

• It signals that the vehicle’s onboard diagnostics detected a fault — from minor issues like a loose fuel cap to more serious engine or emissions problems.
• Light steady: non-emergency but requires timely diagnosis to avoid increased fuel use or progressive damage.
• Light flashing: indicates a severe fault, such as repeated misfires, and requires immediate attention to prevent costly damage.
• Bring your 2024 Lexus IS to Nalley Lexus Roswell for an accurate code read, prioritized repair plan, and warranty-compliant service performed by certified technicians.

How much does a check engine light diagnostic cost for a 2024 Lexus IS?

• Diagnostic fees vary by complexity; typical dealer diagnostic scans range from approximately $149–$199, with precise pricing provided up front.
• If the issue is covered by warranty, diagnostics and covered repairs are handled at our dealership to preserve warranty protection.
• Repair costs depend on the root cause: simple fixes are inexpensive, while parts like catalytic converters are pricier; we provide transparent estimates before any work.
• Nalley Lexus Roswell often costs less than independent shops over time by avoiding misdiagnosis, offering genuine parts, and ensuring long-term reliability and warranty compliance.

What is the most common reason for check engine light on a 2024 Lexus IS?

• Loose or faulty gas cap is the single most frequent and easiest-to-fix cause.
• Oxygen sensors and EVAP system leaks are common emissions-related triggers that affect fuel economy and performance.
• Ignition misfires, spark plugs/coils, or catalytic converter issues can also illuminate the light and should be diagnosed promptly.
• For accurate diagnosis and warranty protection, trust Nalley Lexus Roswell’s factory-trained technicians to identify the underlying cause and recommend the most cost-effective repair.