Frequently Asked Questions

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

• Typical diagnostic scans range from approximately $100 to $200, depending on the depth of testing and parts testing required.
• At Nalley Lexus Smyrna we often offer competitive pricing compared with independent shops while providing factory-trained technicians and OEM tools.
• Diagnostic fees are frequently credited toward repairs if you choose to have the work done with us, delivering immediate savings.
• Any repairs covered by warranty must be performed at a certified dealership to preserve coverage and ensure long-term protection.

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

• The light signals the vehicle’s onboard computer has detected an emissions, sensor, or drivetrain issue — severity ranges from minor to urgent.
• A steady light usually indicates a non-emergency condition that still needs timely diagnosis to avoid more costly repairs later.
• A flashing light signals a serious fault like a misfire that can damage the catalytic converter; stop driving and seek immediate service.
• Bring the vehicle to Nalley Lexus Smyrna for an accurate scan; our factory-trained team pinpoints root causes to maximize long-term savings and warranty compliance.

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

• Start with simple checks you can do safely: confirm the gas cap is tight, check fuel level, and glance for obvious leaks or dashboard warnings.
• Inspect for low oil or other fluid alerts and make note of performance changes such as rough idle, stalling, or loss of power.
• If the light remains or the vehicle runs poorly, arrange a diagnostic at Nalley Lexus Smyrna — our initial scan is efficient and helps avoid escalating damage.
• Remember: any warranty-covered repair requires service at a certified dealership to keep long-term protections intact.

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

• The most frequent causes include a loose gas cap, a failing oxygen sensor, or issues with the EVAP system — these often trigger emissions-related codes.
• Sensors that drift out of specification (oxygen, mass air flow) are common and, if unchecked, can harm fuel economy and the catalytic converter.
• Addressing sensor or EVAP issues early at our dealership preserves fuel efficiency and prevents larger repair bills down the road.
• We provide clear cost estimates and explain how dealership service delivers immediate and long-term savings through correct fixes and warranty protection.

How long does a check engine light service take?

• An initial scan and code read can take 20–45 minutes; a complete diagnostic that includes road testing and component testing typically takes 1–3 hours.
• Repair times vary by problem: sensor swaps can be completed in a few hours while catalytic converter or complex drivability issues may require more time.
• Nalley Lexus Smyrna uses OEM parts and factory procedures to ensure correct repairs the first time, reducing repeat visits and saving you money long term.
• When repairs fall under warranty, work must be completed at a certified dealership to maintain coverage and ensure lasting value.