Frequently Asked Questions

How much does a check engine light diagnostic cost for a 2021 Lexus RX 350L?

• Dealer diagnostic fees typically range from $80–$150; we often offer service specials that reduce that cost further.
• Nalley Lexus Smyrna frequently costs less than independent shops when you factor in accurate diagnosis, OEM parts, and efficient repair times.
• Immediate savings come from getting the right repair the first time; long-term savings come from avoiding collateral damage and preserving fuel economy.
• Note: repairs covered under warranty must be performed at a certified dealership to maintain coverage and ensure proper reimbursement.

What does it mean when the check engine light comes on in a 2021 Lexus RX 350L?

• The light indicates the vehicle's computer has detected a fault in emissions, ignition, fuel delivery, or related systems.
• A diagnostic scan reads fault codes that identify the affected system, guiding an accurate repair plan.
• Timely dealer diagnosis prevents minor issues from escalating into expensive repairs like catalytic converter failure.
• Our factory-trained technicians use OEM diagnostics and parts to protect vehicle performance and warranty benefits.

What is the most common reason for check engine light on a 2021 Lexus RX 350L?

• Frequent causes include faulty oxygen sensors, loose or damaged gas caps, and ignition misfires that trigger emissions codes.
• Ignored oxygen sensor faults can lower fuel economy and damage the catalytic converter, increasing repair costs over time.
• Nalley Lexus Smyrna’s technicians quickly identify root causes, often delivering better value than independent shops due to specialized tools and parts access.
• Remember: warranty-covered repairs must be performed at a certified dealership to remain valid and fully protected.

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

• Begin with simple checks: make sure the gas cap is tight and inspect for obvious signs like unusual noises or leaks.
• If the cap is secure and the light persists, bring the vehicle to our service center for a proper scan and inspection.
• Dealer diagnostics reduce unnecessary part replacements and deliver more accurate repair plans than trial-and-error fixes.
• If the issue is warranty-related, repairs must be completed at a certified dealership to preserve coverage and long-term savings.

How long does a check engine light service take?

• Diagnostic scans usually take 30–90 minutes; simple repairs may be completed the same day.
• Complex issues—such as intermittent misfires or parts that must be ordered—may require additional time for a thorough diagnosis and repair.
• Our factory-trained technicians and streamlined processes typically shorten turnaround times and lower total ownership costs versus many independent shops.
• For warranty-covered repairs, completing work at a certified dealership keeps your coverage intact and avoids future out-of-pocket expenses.