Frequently Asked Questions

What is the most common reason for check engine light on a 2018 Lexus RX 350L?

• Most common causes include misfires (spark plugs or ignition coils), faulty oxygen sensors, or an EVAP system leak—issues that affect performance and emissions.
• Ignoring these can reduce fuel economy (RX 350L averages 19 city / 26 highway mpg) and risk catalytic converter damage, increasing long‑term costs.
• Nalley Lexus Smyrna offers factory‑trained technicians who diagnose root causes quickly, often costing less than independent shops when you factor immediate repairs and long‑term savings.
• Remember: warranty repairs must be completed at a certified dealership to protect coverage.

What does it mean when the check engine light comes on in a 2018 Lexus RX 350L?

• It signals the vehicle’s onboard diagnostics have detected a fault—anything from a loose gas cap to an engine misfire or emissions control failure.
• Severity varies: a steady light can indicate a non‑urgent issue; a flashing light often indicates a severe misfire that can damage the catalytic converter.
• Bring your RX 350L to Nalley Lexus Smyrna for a proper scan and diagnosis so repairs are performed by certified technicians and maintain any warranty benefits.
• Our service approach emphasizes immediate savings through accurate diagnostics and long‑term value with factory parts and expertise.

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

• Start with simple checks: ensure the gas cap is tightened—an EVAP leak from a loose cap is a common trigger.
• If the cap is secure and the light stays on, schedule a diagnostic scan; Nalley Lexus Smyrna uses OEM scanners that read manufacturer‑specific codes for the 2018 Lexus RX 350L.
• Prompt diagnostics reduce the chance of secondary damage and often save money versus delaying repairs—our certified team balances fast turnaround with thorough work.
• Remember warranty repairs must be done at a certified dealership to remain valid.

How much does a check engine light diagnostic cost for a 2018 Lexus RX 350L?

• Diagnostics typically range from a modest fee for a basic scan to a higher diagnostic labor charge if in‑depth troubleshooting is needed; exact pricing depends on the issue identified.
• At Nalley Lexus Smyrna, our transparent pricing and factory tools often deliver better immediate value and lower long‑term cost than independent shops by finding root causes quickly.
• If repairs are covered by warranty, those repairs must be performed at a certified dealership to keep coverage intact.
• Contact our service center or visit our service specials to learn current diagnostic offers and to schedule a convenient appointment.

How long does a check engine light service take?

• Basic code reads often take 30–60 minutes; diagnosing intermittent faults or performing repairs can take several hours depending on complexity.
• Nalley Lexus Smyrna prioritizes efficient service—our factory‑trained technicians use OEM procedures and parts to complete work correctly the first time, reducing repeat visits and saving you time and money.
• Complex issues requiring parts or extended diagnostics will be communicated clearly, including estimated completion and cost, so you can decide wisely.
• For warranty work, repairs must be done at a certified dealership to preserve coverage and ensure proper documentation.