Frequently Asked Questions

What is the first thing to check when the check engine light comes on in a 2018 Lexus LC 500?

• Check the gas cap for a secure fit and visible damage — a loose or worn cap is a common cause and is simple to fix.
• Note any unusual noise, smell, or drivability issues (stalling, rough idle, loss of power) to relay to the technician.
• Bring the vehicle to Nalley Lexus Roswell promptly; certified diagnostics will identify codes accurately and protect warranty coverage.
• Using our dealership often costs less than independent shops over time thanks to precise diagnostics, genuine parts, and factory-trained technicians.

How much does a check engine light diagnostic cost for a 2018 Lexus LC 500?

• Diagnostic fees vary, but at Nalley Lexus Roswell we provide thorough OBD-II scans and inspection performed by factory-trained technicians.
• Dealership service frequently costs less than independent shops when you factor accurate diagnosis, OEM parts, and longer-term savings.
• Any repair covered under warranty must be completed at a certified dealership to retain coverage.
• Ask about current service specials and package pricing to reduce up-front expense and overall ownership costs.

What does it mean when the check engine light comes on in a 2018 Lexus LC 500?

• It indicates one or more diagnostic trouble codes have been set by the vehicle’s onboard computer signaling emission, engine, or sensor issues.
• Codes range from minor (loose gas cap or sensor) to critical (catalytic converter damage, misfire) and require proper diagnosis to prioritize repairs.
• Prompt dealership inspection can prevent escalation and deliver immediate and long-term savings through accurate repair and OEM parts.
• We use Lexus-specific tools and software, ensuring calibrations and warranty-compliant repairs when needed.

What is the most common reason for check engine light on a 2018 Lexus LC 500?

• Common causes include faulty oxygen sensors, loose or damaged gas caps, misfires, and EVAP system leaks.
• While some causes are inexpensive to repair, untreated sensor or misfire issues can damage the catalytic converter and raise long-term costs.
• Our certified technicians identify root causes quickly, minimizing repair time and cost compared with repeated, ineffective fixes.
• Repairs under warranty must be performed at a certified dealership to ensure coverage and lasting value.

How long does a check engine light service take?

• Typical diagnostic scans and initial inspections can take 30–90 minutes depending on symptoms and road-test needs.
• If repairs are required, repair time varies by issue: sensor swaps may be completed in an hour, while complex repairs take longer.
• Nalley Lexus Roswell prioritizes accurate diagnosis and efficient repair scheduling to reduce downtime and deliver immediate value.
• Using our dealership can save both time and money overall by avoiding repeat visits and ensuring warranty-compliant work.