Frequently Asked Questions

How much does a check engine light diagnostic cost for a 2023 Lexus ES 250?

• Typical dealer diagnostic fees range from about $100–$200, with many service specials available to reduce or waive that fee; check our service specials at /specials/service.htm.
• Nalley Lexus Roswell often costs less than independent shops while delivering higher service standards and factory-trained technicians, producing immediate and long-term savings.
• If the repair is covered under warranty, the diagnostic and repair must be performed at a certified dealership to preserve coverage and ensure OEM parts and procedures.
• We provide clear estimates before work begins so you can weigh repair options and expected long-term value.

What does it mean when the check engine light comes on in a 2023 Lexus ES 250?

• It signals that the vehicle's onboard diagnostics detected an emissions, ignition, fuel, or sensor issue that needs attention.
• Common causes include a loose gas cap, oxygen sensor, EVAP system leak, misfire, or catalytic converter issues—severity varies by fault code.
• At Nalley Lexus Roswell we read the exact code with OEM-grade scanners and explain whether immediate repair is required or a monitored condition can be scheduled.
• Addressing faults promptly preserves fuel economy, protects emission systems, and avoids escalating repair costs down the road.

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

• First, ensure the gas cap is tightened; a loose or damaged cap is a frequent, simple cause of an illuminated light.
• Note any drivability symptoms—loss of power, rough idle, stalling, or smells—and report them to service staff to aid diagnosis.
• Bring your 2023 Lexus ES 250 to Nalley Lexus Roswell if symptoms are present or the light stays on; we use factory-calibrated tools and technicians to identify the root cause.
• Remember: warranty-covered repairs must be completed at a certified dealership to maintain coverage and guarantee OEM parts and labor.

How long does a check engine light service take?

• Diagnostics typically take 30–90 minutes depending on symptoms and access to the vehicle; many simple issues are diagnosed the same day.
• Simple repairs like gas cap replacement or minor sensor swaps can often be completed same-day; complex repairs (catalytic converter, engine internals) may require one to several days.
• Nalley Lexus Roswell aims for efficient turnaround using factory-trained technicians and OEM parts, minimizing downtime and delivering better long-term value than many independent shops.
• We provide transparent timelines and estimates up front and can schedule service to suit your needs at /service.htm or visit our service specials at /specials/service.htm.

What is the most common reason for check engine light on a 2023 Lexus ES 250?

• The most frequent causes are a loose or faulty gas cap and oxygen sensor issues; both affect emissions monitoring and fuel trim.
• Other common triggers include EVAP leaks, ignition misfires, and mass airflow or fuel system irregularities—each has distinct repair paths and cost implications.
• Nalley Lexus Roswell diagnoses the exact code and recommends OEM repairs to prevent repeat failures and protect resale value.
• Choosing dealership service often reduces lifecycle costs by using correct parts and procedures and preserving warranty protections that require certified-dealership repairs.