Frequently Asked Questions

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

• Confirm the gas cap is tight — a loose or damaged cap is a common trigger for the 2023 Lexus RX 350 check engine light and is an easy fix.
• Look for obvious symptoms: loss of power, odd noises, smoke, or fuel smell — these signal a more urgent issue.
• Check dashboard messages and any related lights (e.g., ABS, traction) to help narrow the cause.
• If the light is flashing, stop driving and have the vehicle inspected immediately by Nalley Lexus Smyrna to avoid further damage.
• For warranty-covered repairs, have work performed at a certified dealership to protect coverage and long-term value.

How long does a check engine light service take?

• Initial diagnostic scan typically takes 30–60 minutes using factory-grade tools on a 2023 Lexus RX 350.
• Simple fixes like tightening a gas cap or replacing a sensor can often be completed the same day.
• Complex repairs (fuel or catalytic systems, misfires) vary and may require parts — expect several hours to a day in many cases.
• Nalley Lexus Smyrna often completes work faster and at lower cost than independent shops thanks to efficient processes and factory-trained technicians.
• Warranty repairs must be done at a certified dealership to ensure coverage; our service team will advise on timing when diagnostics are complete.

How much does a check engine light diagnostic cost for a 2023 Lexus RX 350?

• Diagnostic fees typically range from a modest flat rate for a basic scan to a slightly higher rate when in-depth testing is needed.
• At Nalley Lexus Smyrna you often pay less than independent shops while receiving factory-calibrated diagnostics and genuine parts.
• Immediate savings come from accurate diagnosis and correct repairs; long-term savings come from preventing further engine or emissions damage.
• If a needed repair is covered under warranty, it must be performed at a certified dealership to maintain coverage and avoid out-of-pocket costs.
• We’ll provide a clear estimate before any repair so you understand the cost-benefit of prompt, professional service.

What does it mean when the check engine light comes on in a 2023 Lexus RX 350?

• The light signals that the vehicle’s emissions or engine control system has detected a fault and logged a diagnostic trouble code.
• Causes range from minor (loose gas cap, sensor fault) to serious (engine misfire, catalytic converter or turbocharger issues).
• Early inspection at our dealership prevents escalation; unresolved issues can reduce fuel economy and cause costly repairs.
• Our factory-grade diagnostic tools read manufacturer codes and live data to pinpoint causes quickly for the 2023 Lexus RX 350.
• Warranty-covered diagnostics and repairs must be performed at a certified dealership to protect your coverage and vehicle value.

What is the most common reason for check engine light on a 2023 Lexus RX 350?

• Common triggers include a loose or faulty gas cap, oxygen sensor failures, or issues with the evaporative emissions (EVAP) system.
• Other frequent causes are misfires from ignition components or fuel delivery problems and faulty catalytic converter performance codes.
• Addressing these early saves fuel and prevents damage to the turbocharger and emissions systems on the 2.4L engine.
• Nalley Lexus Smyrna’s technicians use OEM diagnostics to separate simple fixes from issues needing parts replacement or deeper repair.
• Repairs covered under warranty must be completed at a certified dealership to ensure coverage and long-term reliability.