Frequently Asked Questions

What is the most common reason for check engine light on a 2023 Lexus IS 350?

• Loose or damaged gas cap allowing fuel vapors to escape and triggering an emissions fault code.
• Oxygen sensor wear or failure affecting fuel trim and emissions; left unchecked this can reduce fuel economy.
• Spark plug or ignition coil issues that cause misfires and can harm the catalytic converter if not repaired.
• Mass air flow or intake sensor problems altering air/fuel mixture and performance.
• At Nalley Lexus Smyrna our diagnostics isolate the cause quickly using OEM tools; repairs here often cost less overall than at independent shops because we prevent repeat failures and protect warranty coverage.

How much does a check engine light diagnostic cost for a 2023 Lexus IS 350?

• Diagnostics at our dealership typically include a full scan, live-data review, and a technician inspection to confirm the root cause.
• Initial scan fees are transparent and competitive; because we use factory tools and genuine parts the long-term cost is frequently lower than independent alternatives.
• Immediate savings come from accurate diagnosis that avoids unnecessary parts. Long-term savings stem from correct repairs and warranty protection.
• Any repair covered under warranty must be completed at a certified dealership to preserve coverage.
• Contact our service team for current diagnostic pricing and available service specials at /specials/service.htm.

What does it mean when the check engine light comes on in a 2023 Lexus IS 350?

• An illuminated check engine light signals the powertrain control module has detected a fault in emissions, ignition, fuel, or exhaust systems.
• Codes range from minor (evap system leak) to serious (misfire, catalytic converter efficiency), and each requires a proper scan to identify.
• Driving with an unresolved fault can increase fuel use, emissions, and the risk of more expensive repairs.
• Nalley Lexus Smyrna uses OEM diagnostics and factory-trained technicians to find the true cause quickly, minimizing downtime and ensuring warranty compliance.
• We often deliver lower total ownership cost by preventing repeat issues and using genuine parts backed by manufacturer support.

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

• Confirm the gas cap is tightened properly; it’s an easy fix that commonly clears an emissions-related code.
• Note vehicle behavior—loss of power, rough idle, or a flashing light—and relay that to the service advisor for priority assessment.
• A quick scan at our service center will reveal stored codes; accurate diagnosis avoids unnecessary parts replacement.
• If the light is flashing, stop driving and have the vehicle inspected immediately to avoid damage to critical components.
• For warranty-covered issues, repairs must be performed at a certified dealership like Nalley Lexus Smyrna to protect coverage and long-term value.

How long does a check engine light service take?

• Basic diagnostics—scan and initial assessment—are often completed within an hour; more complex faults that require live-data testing or road checks may take longer.
• If repairs are needed, time varies by the part and repair complexity; many common repairs are completed the same day with parts on hand.
• Our factory-trained technicians and OEM tools streamline troubleshooting, reducing repeat visits and overall downtime.
• We prioritize transparent timing and will provide an estimated completion time and cost before any work begins.
• Scheduling online or calling ahead lets us prepare parts and save you time—see our service specials at /specials/service.htm.