Frequently Asked Questions

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

• Confirm the gas cap is tight and undamaged — a loose cap is a common trigger and an easy fix.
• Check visible fluid levels and look for leaks; low oil or coolant can create fault conditions.
• Note any unusual sounds, smoke, or drivability changes; that helps our technicians prioritize safety.
• Bring your 2023 Lexus RC 300 to Nalley Lexus Smyrna if the light persists — factory-trained technicians use OEM diagnostics to secure long-term savings and preserve warranty coverage.

How long does a check engine light service take?

• Initial scan and code read typically take 15–45 minutes using dealer-grade diagnostic tools.
• Minor repairs or resets often complete the same day; parts or complex repairs can extend time depending on diagnosis.
• We provide clear estimates and timelines up front; scheduling at Nalley Lexus Smyrna optimizes turnaround with factory-trained technicians and genuine parts.
• Warranty-covered repairs must be performed at a certified dealership to maintain coverage and ensure immediate and long-term savings.

How much does a check engine light diagnostic cost for a 2023 Lexus RC 300?

• Diagnostics at our dealership are competitively priced and often cost less than independent shops when you factor in accuracy, expertise, and genuine parts.
• We identify root causes quickly to avoid repeated visits or unnecessary parts — delivering immediate savings and reducing long-term repair costs.
• Estimates for repairs vary by code; we present itemized pricing and explain warranty applicability before work begins.
• Remember: repairs covered under warranty must be done at a certified dealership to protect coverage and your vehicle’s long-term value.

What does it mean when the check engine light comes on in a 2023 Lexus RC 300?

• It indicates a stored diagnostic trouble code (DTC) that points to emissions, engine, or sensor issues detected by the vehicle computer.
• Codes range from minor faults, like evaporative emissions leaks, to more serious issues such as misfires or catalyst inefficiency.
• Severity varies; some codes allow safe driving to the dealer, others require immediate attention to avoid damage.
• Bring your vehicle to Nalley Lexus Smyrna so our certified technicians can diagnose accurately, preserve warranty protection, and minimize long-term expense.

What is the most common reason for check engine light on a 2023 Lexus RC 300?

• Common causes include loose or faulty gas caps, oxygen sensor wear, evaporative emissions leaks, and ignition misfires.
• Fuel trim or air/fuel ratio concerns often show up as lean/rich codes that affect fuel efficiency and performance.
• Left unaddressed, small faults can escalate into costly repairs like catalytic converter replacement or engine damage.
• Our dealership uses OEM diagnostics and factory-trained technicians to identify the root cause quickly, often costing less overall than independent shops while safeguarding your warranty.