Frequently Asked Questions

What is the most common reason for check engine light on a 2023 Toyota Mirai?

• Sensors and emissions components are the most frequent causes: oxygen sensors, hydrogen system sensors, or exhaust-related monitors can trigger the light.
• Minor sensor replacements often have low parts and labor costs, while ignoring them can lead to higher fuel consumption or secondary damage.
• At Nalley Toyota of Roswell, factory-trained technicians diagnose the root cause quickly, minimizing both immediate repair bills and long-term expenses.
• Remember: repairs covered under warranty must be performed at a certified dealership to maintain coverage and ensure proper parts and diagnostics.

What does it mean when the check engine light comes on in a 2023 Toyota Mirai?

• A steady light usually indicates a stored fault code in the vehicle’s control systems requiring diagnostic review by a technician.
• A flashing light often signals a severe condition that needs immediate attention to prevent damage to the powertrain, hydrogen system, or emissions equipment.
• Our dealership uses Toyota-specific tools to read codes accurately and recommend the right repair, helping avoid unnecessary parts replacement.
• Choosing Nalley Toyota of Roswell provides immediate and long-term savings through accurate diagnostics, genuine parts, and certified service procedures.

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

• Check for obvious issues first: fuel cap tightness or visible leaks in hydrogen-related components—simple items can cause a code.
• Next, have a certified diagnostic scan performed; modern Mirai systems require Toyota-grade scanners to read manufacturer codes reliably.
• Our technicians at Nalley Toyota of Roswell will confirm whether a quick fix resolves the issue or if a deeper service is needed.
• Because warranty-covered repairs must be done at a certified dealer, bringing the vehicle here preserves coverage and saves money over time.

How much does a check engine light diagnostic cost for a 2023 Toyota Mirai?

• Diagnostic fees vary by complexity, but our dealership offers transparent pricing and often costs less than independent shops while delivering higher service levels.
• Simple code reads may be modestly priced; advanced diagnostics for hydrogen or powertrain systems can be higher due to specialized tools and expertise.
• Immediate savings come from accurate diagnosis that prevents unneeded repairs; long-term savings result from correct fixes and manufacturer parts.
• Any repairs covered under warranty must be completed at a certified dealership like Nalley Toyota of Roswell to keep warranty protection intact.

How long does a check engine light service take?

• Basic diagnostics often take 30–60 minutes; more complex issues with hydrogen system components or power electronics can require several hours or a full-day appointment.
• If parts are needed, time depends on availability; we stock many common items and can order specialty parts quickly through Toyota channels.
• Nalley Toyota of Roswell schedules service to minimize downtime and uses manufacturer tools to reach definitive repairs faster, delivering overall time and cost savings.
• For warranty repairs, completing service at a certified dealership ensures correct procedures and preserves coverage, reducing future service needs and costs.