Frequently Asked Questions

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

• Common causes include loose or faulty gas caps, oxygen sensor wear, catalytic converter issues, or emissions-related sensors triggered by hybrid system components.
• Many issues start small (a loose cap or worn sensor) but left unchecked can lead to worse fuel economy and higher repair costs.
• Nalley Lexus Roswell often identifies and repairs these problems faster and for less than many independent shops, because our factory-trained technicians use Lexus-specific diagnostics and parts.
• Repairs covered by warranty must be performed at a certified dealership to preserve coverage and ensure correct factory procedures are followed.

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

• A steady light indicates a stored fault code in the vehicle’s onboard computer; it can be anything from minor emissions issues to sensor failures.
• A flashing light usually signals a more severe problem that needs immediate attention to avoid engine or hybrid system damage.
• Diagnostics at Nalley Lexus Roswell use OEM-level tools to read codes and determine if the issue affects emissions, performance, or hybrid components.
• Addressing codes promptly provides immediate savings in fuel and prevents costly long-term repairs; warranty repairs must be done at a certified dealership.

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

• Start with the basics: ensure the gas cap is tight and undamaged — a loose cap is a frequent cause of a check engine light.
• Look for obvious signs: unusual noises, smells, or performance loss; if any appear, stop driving and have a technician inspect the vehicle.
• For hybrid vehicles like the 2025 Lexus RX 350h, avoid DIY resets that bypass hybrid system protections; certified dealers can safely evaluate hybrid-specific codes.
• Bring the vehicle to Nalley Lexus Roswell for a quick OEM diagnostic; we often cost less than independent shops and offer long-term savings through correct repairs and warranty protection.

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

• Diagnostic fees vary with complexity but commonly range from a modest flat fee to slightly higher for advanced hybrid system scans; exact pricing is provided upon arrival.
• Nalley Lexus Roswell frequently offers competitive diagnostics that can cost less than many independent shops while delivering factory-level accuracy and parts.
• Immediate savings come from precise diagnostics that prevent unnecessary parts replacement; long-term savings stem from correct repairs performed by Lexus-trained technicians.
• If the repair is covered under warranty, work must be completed at a certified dealership to retain coverage and use OEM parts and procedures.

How long does a check engine light service take?

• Simple diagnostics and basic fixes (like tightening a gas cap or replacing a small sensor) can often be done within an hour or two.
• Complex issues—especially those involving hybrid modules, catalytic converters, or multi-step repairs—may take several hours to a day depending on parts availability and required testing.
• Nalley Lexus Roswell prioritizes accurate, efficient service using OEM tools and parts; this reduces repeat visits and saves you time and money over independent shops.
• Repairs under warranty must be completed at a certified dealer, and our team coordinates parts and documentation so warranty work proceeds smoothly and efficiently.