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: loose or missing gas cap, low oil level, or recent fuel fill with a different grade. A loose gas cap is a common, simple fix.
• Scan the vehicle with a factory-grade diagnostic tool at Nalley Lexus Roswell to read stored trouble codes and freeze-frame data for accurate troubleshooting.
• Document any new symptoms (noise, rough idle, loss of power) to help technicians prioritize repairs.
• Remember: repairs covered under warranty must be performed at a certified dealership to preserve coverage and ensure OEM parts and procedures are used.

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

• Basic diagnostics at our dealership typically start with an inspection and electronic code read; prices vary but are competitively priced to deliver immediate value.
• Nalley Lexus Roswell often costs less than independent shops over time because factory-trained technicians catch root causes faster, reducing repeat visits and long-term repair bills.
• If a covered repair is needed, having diagnostics and repairs performed at a certified dealership ensures warranty protection and OEM parts—required for warranty claims.
• We offer transparent estimates before work begins and can explain immediate and long-term savings from proper, certified service.

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

• The check engine light signals that the vehicle’s computer detected an issue—anything from a minor emissions sensor fault to a condition affecting drivability.
• Common causes include oxygen sensor faults, catalytic converter efficiency, fuel trim or misfire diagnostics; the code read gives direction for repair.
• Ignoring the light can lead to increased fuel consumption, reduced performance, and more costly repairs later; our diagnostics identify whether immediate action is required.
• For covered repairs, have the work performed at Nalley Lexus Roswell so warranty terms remain intact and service is completed by factory-trained technicians.

How long does a check engine light service take?

• Initial diagnostics with factory scanners generally take 30–90 minutes to read codes, capture freeze-frame data, and perform quick visual checks.
• Minor repairs (sensor replacement, gas cap, simple hose repair) can often be finished the same day; more complex issues may require parts ordering and additional time.
• Nalley Lexus Roswell prioritizes efficient repairs—factory-trained technicians and OEM parts reduce callbacks and long-term downtime for greater immediate and lasting savings.
• If a repair is covered under warranty, it must be completed at a certified dealership to preserve coverage and ensure proper documentation and procedures.

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

• The most frequent causes are faulty oxygen sensors, an intermittent misfire, or emissions-related faults like catalytic converter efficiency codes.
• Other routine triggers include fuel system trims (lean/rich conditions) and EVAP system leaks from loose gas caps or hoses.
• Nalley Lexus Roswell uses OEM-level diagnostics to pinpoint the root cause quickly—this reduces unnecessary parts replacement and lowers overall cost.
• When repairs are covered by warranty, having them done at our dealership ensures correct repair procedures, OEM parts, and continued warranty protection.