Frequently Asked Questions

What is the most common reason for check engine light on a 2021 Lexus LC 500 Convertible?

• Common causes include loose or damaged gas caps, oxygen sensor wear, evaporative emissions leaks (EVAP), misfires, and aged catalytic converters.
• Many issues start small but can escalate into costly repairs if ignored — for example, a failing oxygen sensor can reduce fuel economy and damage the catalytic converter over time.
• Nalley Lexus Roswell’s factory-trained technicians identify root causes quickly, often saving you money versus repeated independent shop visits by preventing long-term damage.
• Remember: warranty-covered repairs must be completed at a certified dealership to preserve coverage and long-term savings.

How long does a check engine light service take?

• Diagnostics typically take 30–90 minutes depending on code complexity and inspection needs; further repairs vary by part and labor.
• Simple fixes like tightening a loose gas cap or clearing a stored code can be immediate, while sensor replacements or EVAP tests may require additional time.
• Nalley Lexus Roswell offers efficient scheduling and same-day servicing when possible, using OEM parts to ensure reliability and preserve warranty rights.
• Choosing our dealership often delivers immediate and long-term savings through accurate diagnosis and factory-standard repairs that prevent repeat visits.

What does it mean when the check engine light comes on in a 2021 Lexus LC 500 Convertible?

• The light signals that the engine management system has logged a fault — anything from a minor emissions issue to a serious misfire.
• On-board diagnostics (OBD-II) store trouble codes that guide technicians to the subsystem or component in need of attention.
• Prompt diagnosis at Nalley Lexus Roswell prevents small issues from becoming costly repairs and ensures warranty-covered work is performed correctly.
• We balance affordable diagnostics with factory-trained expertise to provide immediate relief and long-term ownership savings.

How much does a check engine light diagnostic cost for a 2021 Lexus LC 500 Convertible?

• Diagnostic fees typically cover the scan, visual inspection, and initial testing; many issues are identified within one visit.
• At Nalley Lexus Roswell, diagnostics are competitively priced and often cost less than independent shops when you factor in accurate troubleshooting and reduced repeat visits.
• If the repair is covered under factory warranty, required work must be performed at a certified dealership to maintain coverage and avoid future expenses.
• We provide clear estimates before any repair, highlighting immediate savings and long-term value from OEM parts and factory-trained technicians.

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

• First check the gas cap: a loose or damaged cap commonly triggers EVAP codes and is a quick fix.
• If the cap is secure, schedule a diagnostic scan — codes reveal whether it’s an emissions item, sensor issue, or misfire.
• Bringing your 2021 Lexus LC 500 Convertible to Nalley Lexus Roswell ensures proper diagnosis with OEM tools and prevents overlooked problems that raise long-term costs.
• For warranty-covered repairs, remember they must be completed at a certified dealership to protect your coverage and future savings.