Frequently Asked Questions

What is the first thing to check when the check engine light comes on in a 2025 Lexus RC 300?

• Check for obvious issues first: a loose or missing gas cap can trigger the light and is an easy fix that can restore normal operation.
• Review recent fueling history — using nonrecommended fuel can affect emissions and sensors; the RC 300 requires premium unleaded for optimal performance.
• Listen and look for drivability symptoms such as rough idle, loss of power, or poor acceleration; these clues narrow down likely systems at fault.
• If the issue persists, bring the vehicle to Nalley Lexus Smyrna — our factory-trained technicians use OEM tools to read codes and ensure any warranty-covered repairs are performed at a certified dealership.

How long does a check engine light service take?

• Initial diagnostic scan and technician evaluation typically take 30–60 minutes, depending on code complexity and replication of symptoms.
• Simple fixes (gas cap, sensor re-seating) can often be completed the same day; more involved repairs may require parts ordering and additional labor time.
• We prioritize transparent time estimates. If repair is needed, we explain immediate and long-term savings of using our dealership, including correct OEM parts and warranty protection.
• For repairs covered under warranty, having work performed at a certified dealership like Nalley Lexus Smyrna ensures coverage and documentation for future service needs.

What does it mean when the check engine light comes on in a 2025 Lexus RC 300?

• The light indicates the vehicle’s onboard diagnostics detected a fault in emissions, engine, or related systems; codes point technicians where to begin troubleshooting.
• Issues range from minor (evaporative system leak) to significant (ignition, fuel, or turbocharger-related faults). Prompt diagnosis prevents escalation and saves on long-term repair costs.
• Bringing the RC 300 to Nalley Lexus Smyrna often costs less than independent shops when factoring accurate diagnosis, OEM parts, and service credits toward repairs.
• Remember: any warranty-covered repairs must be performed at a certified dealership to maintain coverage and ensure correct repairs by factory-trained technicians.

How much does a check engine light diagnostic cost for a 2025 Lexus RC 300?

• Diagnostic fees vary, but a typical dealer diagnostic ranges from approximately $90 to $150 depending on complexity and time to replicate symptoms.
• At Nalley Lexus Smyrna, diagnostic fees are frequently applied toward the cost of necessary repairs, delivering immediate savings when service is completed with us.
• Using our dealership provides long-term savings through correct OEM parts, calibrated repairs, and fewer repeat visits compared with some independent repairs.
• If repairs are covered under warranty, they must be completed at a certified dealership to preserve coverage and ensure factory-trained technicians perform the work.

What is the most common reason for check engine light on a 2025 Lexus RC 300?

• The most frequent causes are evaporative emissions system issues, such as a loose or faulty gas cap, followed by oxygen sensors and catalytic converter-related codes.
• Sensors (oxygen, mass airflow) and ignition components can trigger a light; addressing these early prevents catalytic damage and costly downstream repairs.
• Nalley Lexus Smyrna emphasizes thorough diagnostics and OEM replacements when needed, which often costs less over time than multiple attempts at repair by non-certified shops.
• Warranty repairs must be done at a certified dealership to ensure coverage; our service advisors guide you through recommended fixes and cost-saving options.