Frequently Asked Questions

What is the most common reason for check engine light on a 2015 Lexus ES 300h?

• Most often it points to emission or ignition issues: loose gas cap, faulty oxygen sensor, or misfires that affect catalytic converter performance.
• Minor causes like an EVAP leak (fuel cap or purge valve) are inexpensive to fix but can trigger the light until repaired.
• Left unaddressed, problems such as misfires and failed catalytic converters can cause much higher repair bills and reduced fuel efficiency.
• At Nalley Lexus Roswell we diagnose accurately and often deliver lower overall costs than independent shops, plus factory-trained technicians and warranty protection.

What does it mean when the check engine light comes on in a 2015 Lexus ES 300h?

• It signals the vehicle’s onboard diagnostics detected an issue ranging from emissions control to engine misfire or sensor failure.
• The light can indicate anything from a simple emissions fault to a condition that needs immediate attention to avoid damage.
• We recommend a prompt diagnostic at a certified dealership so warranty-covered repairs are properly authorized and completed by factory-trained technicians.
• Choosing Nalley Lexus Roswell often yields immediate and long-term savings: accurate diagnosis, correct parts, and tests to prevent repeat visits.

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

• Check that the fuel cap is tight and undamaged — a loose cap is a common, quick fix for an emissions-related light.
• If the cap is secure, schedule a diagnostic scan with our service team; modern hybrids can store codes that require dealer-grade tools.
• Document any symptoms (loss of power, rough idle, strange noises) to help technicians prioritize repairs and reduce time in the shop.
• Remember that warranty-covered repairs must be completed at a certified dealership to maintain coverage and ensure genuine parts are used.

How much does a check engine light diagnostic cost for a 2015 Lexus ES 300h?

• Diagnostics at Nalley Lexus Roswell are competitively priced and often cost less than independent shops when you factor accurate diagnosis and warranty assurance.
• Diagnostic fees typically cover computer scans, technician time, and a detailed report of recommended repairs and cost estimates.
• Immediate savings come from precise troubleshooting; long-term savings follow because factory-trained technicians reduce repeat repairs and install OEM parts.
• If repairs are covered under warranty, they must be performed at a certified dealership to keep warranty protection valid.

How long does a check engine light service take?

• Basic diagnostics often take under an hour, but more complex issues or test drives can extend appointment time.
• Repairs vary: simple fixes like replacing a sensor can be completed same-day; catalytic converter or engine repairs take longer.
• Our service advisors provide time estimates up front and prioritize efficiency—factory-trained technicians, proper tools, and OEM parts speed accurate repairs.
• Scheduling with Nalley Lexus Roswell helps minimize downtime and provide clear cost and time expectations, delivering immediate and long-term value.