Frequently Asked Questions

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

• Check the gas cap: a loose or damaged cap is a common trigger and is quick to secure or replace.
• Confirm fuel type and level — the 2020 Lexus LC 500 runs on premium unleaded; incorrect fueling can cause errors.
• Scan for codes with a diagnostic tool to prioritize issues rather than guessing.
• If a repair may be covered by warranty, remember that warranty-covered work must be completed at a certified dealership.
• For certainty and long-term savings, schedule a diagnostic with Nalley Lexus Roswell—factory-trained technicians, OEM parts, and service specials help lower total ownership cost.

What does it mean when the check engine light comes on in a 2020 Lexus LC 500?

• It flags a fault in emissions, fuel delivery, ignition, or engine management systems; codes pinpoint the subsystem involved.
• Common causes include oxygen sensors, catalytic converter issues, misfires, or fuel system faults tied to the 5.0L V8.
• Some conditions are minor; others can harm performance, fuel economy, and emissions if left unfixed.
• Repairs covered under warranty must be performed at a certified dealership to preserve coverage and ensure genuine parts.
• Nalley Lexus Roswell’s technicians use OEM diagnostics to identify the exact cause and present cost-effective, warranty-compliant solutions.

How long does a check engine light service take?

• Basic diagnostic scans typically take 30–60 minutes to retrieve and interpret codes for the 2020 Lexus LC 500.
• Simple fixes like tightening a gas cap or replacing a sensor can often be completed the same day.
• Complex repairs (e.g., catalytic converter replacement or engine misfire diagnosis) may require parts ordering and several hours to a full day.
• Choosing Nalley Lexus Roswell often reduces repeat visits—factory-trained techs and OEM parts speed accurate repairs and deliver immediate and long-term savings versus piecemeal fixes.
• Always consult us for an exact time estimate; warranty-covered work must be done at a certified dealership to remain valid.

How much does a check engine light diagnostic cost for a 2020 Lexus LC 500?

• Diagnostic fees vary by the depth of testing; a standard code read is often modest, while advanced troubleshooting can cost more due to labor and testing time.
• Nalley Lexus Roswell frequently costs less than independent shops when factoring in accurate diagnosis, genuine parts, and fewer return trips—delivering immediate and long-term savings.
• If repairs are covered under warranty, those repairs must be completed at a certified dealership to maintain coverage and avoid out-of-pocket expense.
• We’ll provide a clear estimate before work begins and recommend service specials where applicable to reduce overall expense.
• Contact our service team online or visit our Service Specials page for current offers and exact pricing details.

What is the most common reason for check engine light on a 2020 Lexus LC 500?

• The most frequent triggers are a loose gas cap, faulty oxygen sensors, or issues with the catalytic converter—each impacting emissions and performance.
• Minor causes like vapor recovery leaks are inexpensive to fix if caught early; catalytic converter or engine misfire repairs can be substantially costlier if delayed.
• Prompt diagnostics at a certified dealership prevent escalation and preserve warranty coverage where applicable.
• Nalley Lexus Roswell’s factory-trained technicians identify root causes quickly, helping you avoid expensive downstream repairs and maximizing fuel economy for this high-performance 5.0L V8 coupe.
• For peace of mind and savings, schedule a diagnostic with our service center or view Service Specials online.