Frequently Asked Questions

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

• Typical diagnostic fees range from about $100–$200 depending on the complexity and time required to reproduce codes and test systems.
• Nalley Lexus Smyrna often costs less than independent shops while delivering superior value through factory-trained technicians, OEM parts and modern diagnostic equipment.
• Choosing us delivers immediate savings (accurate diagnosis and targeted repairs) and long-term savings (prevents cascading failures and costly future repairs).
• Warranty-covered repairs must be performed at a certified dealership to preserve coverage and ensure OEM parts and procedures are used.

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

• Verify simple items first: loosely secured gas cap or recent refueling can trigger codes related to the evaporative system.
• Note any drivability symptoms—stalling, misfire, rough idle or loss of power—and relay them to our service advisors for faster diagnosis.
• At Nalley Lexus Smyrna our technicians use OEM scanners to read codes and freeze frame data, providing a precise starting point for repair.
• If your vehicle is under warranty, repairs must be completed at a certified dealership to retain coverage and ensure correct procedures and parts.

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

• It indicates the engine control module has detected an emissions or drivetrain fault; codes range from minor emissions issues to serious mechanical faults.
• Some causes are benign (evap leaks) while others require immediate attention (misfires or catalytic converter issues) to avoid damage.
• Nalley Lexus Smyrna evaluates codes with OEM-grade tools and offers clear repair options, highlighting immediate and long-term cost benefits of dealer service.
• Remember, warranty items must be serviced at a certified dealership to protect your coverage and ensure proper repairs.

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

• Common triggers include misfires, oxygen sensor or catalytic converter issues, evaporative emissions leaks (loose gas cap or cracked hose), and intake/exhaust sensor faults.
• Misfires (P0300–P0306) and oxygen sensor/catalyst codes (P0420/P0430) are frequent and, if unchecked, can lead to higher repair costs and emissions failures.
• Nalley Lexus Smyrna often identifies and repairs these issues more cost-effectively than independent shops because of efficient diagnostics and OEM parts sourcing.
• Warranty-covered items must be repaired at a certified dealership to maintain coverage and ensure proper resolution.

How long does a check engine light service take?

• Basic diagnostics and code reading usually take 30–60 minutes; a full diagnostic with road testing and component testing can take 1–3 hours depending on symptoms.
• Simple repairs (gas cap, sensor replacements) may be completed the same day; complex repairs requiring parts can extend timelines based on parts availability.
• Nalley Lexus Smyrna prioritizes accuracy and long-term value—our factory-trained technicians minimize repeat visits, which saves you time and money over the life of the vehicle.
• If repairs are covered under warranty, they must be performed at a certified dealership to preserve warranty protection and ensure authorized procedures.