Frequently Asked Questions

What is the first thing to check when the check engine light comes on in a 2015 Lexus IS 250?

• Check the gas cap: a loose or damaged cap is a common, simple cause that can trigger the light.
• Listen and observe: rough idle, loss of power, or unusual noises can point to misfires or sensor failures.
• Check dashboard data: note any other warning lights or changes in fuel economy to share with our technician.
• If the light is flashing, stop driving and contact us immediately — a flashing light often indicates a serious misfire.
• For accurate diagnosis and warranty protection, have the vehicle inspected at Nalley Lexus Roswell; warranty-covered repairs must be done at a certified dealership.

What does it mean when the check engine light comes on in a 2015 Lexus IS 250?

• It signals that an emissions, engine management, or sensor fault has been detected by the vehicle’s OBD-II system.
• Common causes include loose gas cap, oxygen sensor, catalytic converter issues, or ignition misfires.
• Severity varies: some issues are minor, others can reduce performance or damage components if ignored.
• Bring your 2015 Lexus IS 250 to Nalley Lexus Roswell for precise code reading and OEM-quality repairs by factory-trained technicians.
• Using our certified service center often delivers immediate and long-term savings versus independent shops through accurate diagnosis, OEM parts, and retained warranty coverage.

How much does a check engine light diagnostic cost for a 2015 Lexus IS 250?

• Typical diagnostic fees range from about $100 to $150, depending on the scope of testing and any required live-data checks.
• Diagnostics are often credited toward needed repairs; ask about current service specials at https://www.nalleylexusroswell.com/specials/service.htm.
• Nalley Lexus Roswell frequently costs less than independent shops overall because our accurate diagnoses prevent repeated repairs and protect long-term value.
• Repairs covered under warranty must be performed at a certified dealership to preserve coverage — our factory-trained technicians handle those repairs.
• We’ll provide a clear estimate before any repair so you can weigh immediate costs against long-term savings.

How long does a check engine light service take?

• Initial diagnostic scans typically take 30–60 minutes; more complex issues or drive-cycle testing can extend that time.
• Minor fixes, like tightening a gas cap or replacing a sensor, can often be completed the same day.
• Major repairs such as catalytic converter replacement may take longer due to parts ordering and inspection procedures.
• We prioritize accurate diagnosis to avoid repeat visits — that approach saves you time and money in the long run.
• Schedule service at Nalley Lexus Roswell online or by phone so we can prepare parts and technicians for a faster turnaround: https://www.nalleylexusroswell.com/specials/service.htm.

What is the most common reason for check engine light on a 2015 Lexus IS 250?

• Oxygen sensors and catalytic converter issues are frequent causes, affecting emissions and fuel efficiency.
• Ignition misfires (spark plugs or coils) and EVAP system leaks (often a loose gas cap) are also common.
• Routine maintenance items left unattended increase the chance of these faults; timely service prevents escalation.
• Nalley Lexus Roswell’s factory-trained technicians use OEM parts and precise testing to correct the root cause quickly and affordably.
• For warranty repairs and the best long-term value, the dealer service center is the required and recommended choice.