Frequently Asked Questions

What is the most common reason for check engine light on a 2025 Lexus RX 350h?

• Often a loose or damaged fuel cap triggers the light and is an easy, low-cost fix.
• Faulty oxygen sensors, catalytic converter issues, or EVAP leaks are common emissions-related causes.
• Misfires from spark plugs, ignition coils, or fuel delivery problems can also illuminate the lamp.
• Hybrid-specific sensors and control modules may register faults that require factory tools to diagnose properly.
• Bring the vehicle to Nalley Lexus Smyrna for an accurate scan—warranty-covered repairs must be done at a certified dealership to preserve coverage.

What does it mean when the check engine light comes on in a 2025 Lexus RX 350h?

• The onboard diagnostics system has detected a fault in emissions, fuel, ignition, exhaust, or hybrid systems and stored a trouble code.
• A steady light usually means a non-emergency issue, while a flashing light indicates a severe or misfire condition that needs urgent attention.
• Symptoms may include reduced power, rough idle, or unusual noises—document what you observe for technicians.
• Our factory-trained technicians use Lexus-grade equipment to read freeze-frame data and recommend the correct repair to avoid unnecessary parts replacement.
• Choosing Nalley Lexus Smyrna often costs less than independent shops through accurate diagnostics and proper repairs that deliver immediate and long-term savings.

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

• Confirm the fuel cap is tightened properly—this simple step resolves many warnings.
• Check oil and coolant levels and look for visible leaks or loose hoses under the hood.
• Note any performance changes, dashboard messages, or if the light is flashing—these details help diagnosis.
• If safe, limit driving and schedule a diagnostic with Nalley Lexus Smyrna to prevent escalation and protect hybrid systems.
• Remember: warranty-covered repairs must be completed at a certified dealership to maintain coverage and ensure genuine parts.

How long does a check engine light service take?

• Initial diagnostics typically take 30–90 minutes depending on stored data, freeze-frame events, and hybrid system checks.
• Simple repairs—tightening a cap or replacing a sensor—can often be completed the same day; complex repairs or parts orders may take longer.
• Hybrid-specific components can increase diagnostic and repair time because of additional safety protocols and test procedures.
• Nalley Lexus Smyrna offers efficient scheduling and factory tools to speed diagnosis and reduce downtime.
• Prompt, correct repairs provide immediate savings by avoiding repeat visits and long-term savings by preventing compounded failures.

How much does a check engine light diagnostic cost for a 2025 Lexus RX 350h?

• Diagnostic fees commonly range from about $89 to $149 for a comprehensive scan and initial analysis; fees vary by service required.
• Many diagnostic fees are credited toward repairs if you choose to proceed with service at our dealership—check current service specials.
• Simple fixes can be inexpensive, while repairs like oxygen sensors or EVAP components typically range higher; preventing escalation saves money.
• Nalley Lexus Smyrna often costs less than independent shops by using precise diagnostics and authentic parts to avoid unnecessary replacements.
• Any repairs covered under warranty must be performed at a certified dealership to keep warranty protection intact and ensure correct procedures.