Frequently Asked Questions

How much does a check engine light diagnostic cost for a 2023 Lexus RC 300?

• Diagnostic fees vary by the issue; a basic computer scan at Nalley Lexus Roswell begins at a competitive rate and may be waived when repair work is performed in our service center.
• We often cost less than many independent shops while offering factory-trained technicians, OEM parts, and transparent estimates—delivering immediate savings on diagnosis and long-term value through correct repairs.
• Any repairs covered under warranty must be performed at a certified dealership to preserve coverage; our team documents and performs warranty work to keep claims smooth and cost-free to the customer when applicable.
• We provide clear quotes before work begins and explain potential downstream repairs to avoid surprise expenses.

What does it mean when the check engine light comes on in a 2023 Lexus RC 300?

• The light signals the vehicle’s onboard diagnostics detected a fault—ranging from a loose gas cap to issues with emissions, sensors, or engine management systems.
• Common triggers include oxygen sensor faults, catalytic converter efficiency, misfires, or fuel delivery and ignition problems.
• Immediate diagnosis prevents minor issues from becoming expensive repairs; our technicians use OEM-grade scanners to read codes and advise on the best corrective action.
• When warranty coverage applies, repairs must be completed at a certified dealership to maintain protection and ensure genuine parts and procedures.

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

• Start with simple checks: ensure the gas cap is tightened properly, because a loose cap is a frequent and inexpensive cause for the light.
• Note the vehicle’s behavior—reduced power, stalling, or odd noises—and relay that to our service advisors; that context helps prioritize tests.
• If the light is steady, schedule a diagnostic scan at Nalley Lexus Roswell; if flashing, drive immediately to the dealer as it can indicate a severe condition.
• For covered warranty issues, have the repair performed at our certified dealership to protect your coverage and ensure long-term savings.

How long does a check engine light service take?

• Typical diagnostic scans take about 30–60 minutes, depending on queue and the complexity of the codes retrieved.
• If additional testing is required—road tests, sensor checks, or component replacement—total service time can extend to a few hours or, for complex jobs, a day or more.
• We provide time estimates up front, and because we stock many OEM parts and have factory-trained staff, our turnaround often saves customers time versus independent shops.
• For warranty repairs, service timelines include documented inspections to satisfy manufacturer requirements, ensuring the repair is handled correctly and under warranty when applicable.

What is the most common reason for check engine light on a 2023 Lexus RC 300?

• One of the most frequent causes is an emissions-related fault—oxygen sensor or catalytic converter inefficiency—which the vehicle’s computer flags to protect performance and emissions compliance.
• Other common reasons include ignition misfires, mass airflow sensor faults, and evaporative system leaks such as a loose fuel cap.
• Addressing these issues promptly at Nalley Lexus Roswell avoids escalation to more expensive repairs and preserves fuel efficiency and drivability.
• Remember: if the repair is covered under warranty, it must be completed at a certified dealership to ensure proper coverage and long-term protection.