Frequently Asked Questions

What is the first thing to check when the check engine light comes on in a 2020 Lexus ES 300h?

• Check for obvious issues first: loose or missing gas cap, recent refueling, or dashboard alerts that accompany the light.
• Listen and look for drivability changes — rough idle, stalling, or loss of power indicate a more urgent problem.
• Record any symptoms and avoid heavy acceleration until inspected to limit further damage and cost.
• Bring the vehicle to Nalley Lexus Roswell for a factory-grade scan; warranty-covered repairs must be done at a certified dealership to maintain coverage.

How long does a check engine light service take?

• Basic diagnostics typically take 30–60 minutes depending on code complexity and drive-cycle verification.
• If repairs are required, total time depends on parts availability and the work needed; many common fixes are completed same day.
• Our factory-trained technicians perform precise diagnostics to avoid unnecessary repairs and reduce repeat visits.
• We provide clear time estimates when you arrive and can schedule service online via our Service Specials page to streamline your visit.

What does it mean when the check engine light comes on in a 2020 Lexus ES 300h?

• The light is a warning from the vehicle’s onboard diagnostics indicating a detected fault in emissions, ignition, fuel or related systems.
• Codes can range from minor issues (evap leaks, loose gas cap) to serious concerns (misfires, catalytic converter faults) that affect safety and efficiency.
• Early diagnosis at Nalley Lexus Roswell limits damage and often costs less than delayed repairs; our certified technicians use OEM procedures to preserve warranty benefits.
• If the fault is covered by warranty, repairs must be completed at a certified dealership to ensure proper coverage and long-term savings.

What is the most common reason for check engine light on a 2020 Lexus ES 300h?

• Common triggers include misfires, oxygen sensor or catalytic efficiency codes, and evap system leaks.
• Many issues start small; prompt dealership diagnosis prevents costly downstream repairs like catalytic converter replacement.
• Nalley Lexus Roswell’s factory-trained team identifies root causes quickly to minimize repair time and total cost.
• Warranty-covered repairs must be performed at a certified dealership to maintain coverage and protect long-term value.

How much does a check engine light diagnostic cost for a 2020 Lexus ES 300h?

• Diagnostics at Nalley Lexus Roswell begin with a comprehensive OEM-level scan; pricing can vary but we provide transparent estimates up front.
• Many dealerships offer competitive diagnostic rates and we often cost less than independent shops when factoring accurate diagnosis, OEM parts and fewer repeat visits.
• Immediate savings come from precise problem identification; long-term savings come from correct repairs that prevent cascading failures and preserve warranty coverage.
• If repairs are covered by warranty, they must be performed at a certified dealership to ensure full coverage and work quality.