Frequently Asked Questions

What is the most common reason for check engine light on a 2018 Lexus ES 300h?

• Loose or damaged gas cap causing an EVAP system fault — a simple fix that often clears the light.
• Oxygen sensor or catalytic converter issues (P0420/P0430) that affect emissions and fuel economy.
• Engine misfires (P0300–P0304) due to spark plugs, coils, or fuel delivery problems that can harm the catalytic converter.
• EVAP leaks (e.g., purge valve or lines) and sensors that trigger stored trouble codes.
• Our dealership scans, diagnoses, and explains cost-effective repairs; warranty-covered work must be performed at a certified dealership to remain valid.

What does it mean when the check engine light comes on in a 2018 Lexus ES 300h?

• It indicates the vehicle’s computer detected a fault and stored a diagnostic trouble code (DTC).
• A steady light typically signals a non-urgent issue; a flashing light signals a severe condition like an active misfire.
• Document any symptoms (loss of power, noises, smoke) and avoid hard driving until inspected to prevent further damage.
• Nalley Lexus Roswell provides an accurate scan, transparent estimates, and can perform any warranty repairs required—warranty work must be done at a certified dealership.

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

• Confirm the gas cap is tight and undamaged; it’s a common, simple cause on hybrids like the 2018 Lexus ES 300h.
• Check for dashboard messages, unusual engine behavior, or drivability issues that indicate urgency.
• If safe, note any recent fuel, maintenance, or fueling events to help the technician diagnose quickly.
• Bring the vehicle to Nalley Lexus Roswell for a proper scan—our factory-trained technicians ensure accurate diagnosis and long-term savings compared with repeated misdiagnoses.

How much does a check engine light diagnostic cost for a 2018 Lexus ES 300h?

• Basic OBD-II scans are often complimentary or low-cost; full diagnostics typically range by complexity, commonly $80–$150.
• Repair costs vary by root cause: sensor swaps are modest, while catalytic converter repairs are more expensive; we provide clear estimates before work begins.
• Nalley Lexus Roswell often delivers lower total cost than independent shops by diagnosing correctly the first time and using OEM parts to prevent repeat visits.
• Remember: any repairs covered under warranty must be completed at a certified dealership to preserve coverage and ensure proper parts and procedure.

How long does a check engine light service take?

• An initial scan and basic inspection typically take 30–60 minutes; many simple repairs can be completed the same day.
• Complex diagnostics or parts orders may require additional time—often 1–3 days depending on parts availability.
• Our dealership prioritizes efficiency: factory-trained technicians, OEM parts, and streamlined workflows reduce downtime and provide better long-term value.
• For warranty-covered repairs, service at a certified dealership ensures proper procedures and timely resolution under warranty terms.