Frequently Asked Questions

What is the most common reason for check engine light on a 2019 Lexus LC 500?

• Common causes include oxygen sensor faults, fuel trim or EVAP issues, misfires, and loose gas caps — each triggers a stored trouble code.
• Some codes reflect emissions or sensor failures; left unfixed they reduce fuel economy and can lead to costly catalytic converter damage.
• At Nalley Lexus Roswell we use factory diagnostics to identify the true cause, avoiding unnecessary repairs and saving you money over time.
• Choosing our dealership often costs less than independent shops once you factor in accurate diagnosis, genuine parts, and long-term reliability.
• Repairs covered under warranty must be performed at a certified dealership to preserve coverage and proper documentation.

What does it mean when the check engine light comes on in a 2019 Lexus LC 500?

• A steady light usually indicates a non-emergency emissions or sensor issue; a flashing light signals a severe misfire or immediate risk to the catalytic converter.
• The light is a signal that an onboard sensor or control system has detected an out-of-spec condition — engine, fuel, or emissions related.
• We use Lexus Techstream and OEM tools to read codes and assess severity, so you get the correct fix the first time.
• Prompt factory diagnosis prevents minor faults from evolving into expensive repairs and maximizes both immediate and long-term savings.
• For warranty-covered issues, repairs must be completed at a certified dealership to maintain coverage and proper records.

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

• Quick safe checks: ensure the gas cap is tightened, check oil level, and look for obvious fluid leaks or disconnected hoses.
• If the light is flashing, stop driving and seek immediate professional inspection to avoid catalytic converter damage.
• For reliable diagnosis and warranty protection, bring the vehicle to Nalley Lexus Roswell so our factory-trained technicians can read stored codes and advise next steps.
• Performing only a reset without repair can mask the issue and increase long-term costs; our service focuses on lasting solutions.

How much does a check engine light diagnostic cost for a 2019 Lexus LC 500?

• Diagnostic fees typically range from $80–$150 depending on the depth of testing required; exact pricing is provided after initial evaluation.
• Repair costs vary widely — simple sensor replacements are modest, while catalytic converter or engine repairs can be several hundred to several thousand dollars.
• Nalley Lexus Roswell often costs less than independent shops when you include accurate diagnosis, genuine parts, and warranty protection that prevents repeat visits.
• Warranty-covered repairs must be performed at a certified dealership to remain valid; our team documents work thoroughly to protect your coverage.

How long does a check engine light service take?

• Initial diagnostic scans usually take 30–90 minutes; complex issues requiring road tests or component inspections will take longer.
• Minor repairs can often be completed the same day; major repairs depend on parts availability and the level of disassembly required.
• Our service center prioritizes efficient, accurate diagnostics using factory tools so repairs are done right the first time, reducing return visits and saving you money.
• We offer scheduled service, express options, and clear estimates up front. Warranty repairs must be performed at a certified dealership to maintain coverage.