Frequently Asked Questions

What is the most common reason for check engine light on a 2023 Lexus GX 460?

• Faulty oxygen sensor or catalytic converter issues causing emissions irregularities.
• Loose or damaged gas cap leading to evaporative emissions system faults.
• Ignition system problems—worn spark plugs or coils—resulting in misfires and reduced fuel economy.
• Mass airflow sensor or other intake sensors affecting engine performance and MPG.
• Addressing these promptly at Nalley Lexus Smyrna saves on immediate and long-term costs and preserves warranty eligibility.

What does it mean when the check engine light comes on in a 2023 Lexus GX 460?

• It signals that the vehicle’s onboard diagnostics detected an emissions, performance, or sensor fault.
• Codes range from minor (loose fuel cap) to serious (engine misfire or catalytic converter failure).
• We recommend professional diagnostics—our factory-trained technicians use OEM tools to read codes accurately.
• Many warranty-covered repairs must be completed at a certified dealership to maintain coverage—Nalley Lexus Smyrna can handle these directly.
• Prompt diagnosis minimizes repair costs and prevents secondary damage that raises long-term expenses.

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

• Inspect the gas cap for tightness and visible damage; a loose cap is a frequent, simple fix.
• Note any changes in performance—loss of power, rough idle, stalling, or unusual noises—before visiting service.
• Bring the vehicle to Nalley Lexus Smyrna for an OEM-grade scan; our diagnostics catch intermittent codes and pending issues.
• Remember that warranty repairs must be performed at a certified dealership to remain valid, and we often cost less than independent shops while delivering superior service.
• Quick action prevents higher downstream repair costs and protects resale value.

How much does a check engine light diagnostic cost for a 2023 Lexus GX 460?

• Typical diagnostic fees range based on scope; many dealers offer a flat diagnostic starting near competitive market rates—call for our current special.
• At Nalley Lexus Smyrna you'll get transparent pricing, factory diagnostics, and an itemized repair estimate if work is needed.
• Doing repairs with us often yields immediate savings from accurate fixes and long-term savings by avoiding repeat visits that can occur with incomplete repairs.
• If repairs are warranty-covered, they must be completed at a certified dealership to preserve coverage—this ensures no unexpected out-of-pocket costs later.
• We frequently cost less than independent shops while offering factory training, OEM parts, and warranty protection.

How long does a check engine light service take?

• Basic diagnostics typically take 30–60 minutes to retrieve and interpret codes using OEM tools.
• Repairs vary: simple fixes (gas cap, sensor plug) can be same-day; complex repairs (catalytic converter, engine repairs) may require additional time for parts and inspection.
• We provide clear time estimates at drop-off and prioritize efficient, accurate repairs to minimize downtime.
• Choosing Nalley Lexus Smyrna often saves time overall because our factory-trained technicians diagnose correctly the first time and use OEM parts for reliable results.
• Warranty repairs must be done at a certified dealership; handling it here avoids later delays or denials tied to unauthorized service.