Frequently Asked Questions

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

• Confirm the gas cap is tightened—an insecure cap is a common, simple cause.
• Note driving behavior and any new noises, smells, or performance loss to report to technicians.
• Check basic indicators like oil and coolant levels if safe to do so.
• If the light is flashing or performance is poor, stop driving and have the vehicle inspected immediately.
• Bring your 2023 Lexus RX 500h to Nalley Lexus Roswell for a fast, accurate scan—repairs covered by warranty must be done at a certified dealership.
• Choosing our dealership often costs less than independent shops while delivering long-term savings through correct, factory-standard repairs.

How long does a check engine light service take?

• A basic diagnostic scan typically takes 15–45 minutes to retrieve codes and initial data.
• Simple fixes like tightening a gas cap or clearing a false code can be same-day services.
• Complex diagnostics or intermittent faults may require extended testing, road tests, and component checks, which can take several hours to a day.
• Repair time varies by needed parts and labor; our service advisors provide clear timelines and options up front.
• Warranty-covered repairs must be completed at a certified dealership to preserve coverage and ensure long-term savings.

What does it mean when the check engine light comes on in a 2023 Lexus RX 500h?

• The light signals the vehicle’s computer has detected an emissions, engine, or hybrid-system anomaly.
• Common sources include oxygen sensors, EVAP leaks, ignition misfires, or hybrid battery/management alerts.
• Some issues may be minor; others can affect fuel economy, emissions, or cause further damage if ignored.
• Our factory-trained technicians use Lexus diagnostic tools to identify root causes quickly and accurately.
• Prompt dealer diagnosis often saves money over time by preventing costly downstream repairs and preserving warranty coverage.

How much does a check engine light diagnostic cost for a 2023 Lexus RX 500h?

• Typical diagnostic scans range from about $80–$150, depending on region and test complexity.
• If additional testing or parts are required, our advisor will provide a clear estimate before work begins.
• Nalley Lexus Roswell often costs less than independent shops for complete repairs while offering factory training, genuine parts, and software updates.
• Choosing the dealership can provide immediate savings through accurate diagnosis and long-term savings by preventing repeat failures.
• Remember: repairs covered under warranty must be performed at a certified dealer to remain valid.

What is the most common reason for check engine light on a 2023 Lexus RX 500h?

• A loose or faulty gas cap and EVAP system leaks are frequent, easily corrected causes.
• Oxygen sensor and catalytic converter issues are common and impact emissions and efficiency.
• Ignition misfires from spark plugs or coils may trigger the light and damage the catalytic converter if not addressed.
• Hybrid-system sensors and battery management alerts are specific to hybrid models and deserve prompt dealer attention.
• Accurate diagnosis at a certified dealership prevents unnecessary parts replacement and helps protect long-term value.