Frequently Asked Questions

How much does a check engine light diagnostic cost for a 2025 Toyota Mirai?

• Typical diagnostic fees range from about $80–$150 depending on the tests required and whether extended road or system checks are needed.
• If a repair is required, our estimates are transparent; performing work at Nalley Toyota Stonecrest often costs less than independent shops when you factor in accurate diagnostics, OEM parts, and fewer repeat visits.
• Warranty-covered repairs must be performed at a certified dealership to preserve coverage — our factory-trained technicians and specialized tools ensure warranty compliance.
• We provide clear cost breakdowns so you see immediate savings and avoid larger long-term expenses from unresolved issues.

What does it mean when the check engine light comes on in a 2025 Toyota Mirai?

• A steady check engine light signals a detected fault in emissions, powertrain, or related systems that requires diagnosis to pinpoint the cause.
• On a hydrogen fuel cell vehicle like the 2025 Toyota Mirai, the light can indicate sensor issues, emissions control concerns, or auxiliary system faults — proper scanning by factory equipment reveals the exact code.
• Addressing the underlying fault promptly prevents greater damage and costly repairs; dealership service typically yields lower total cost of ownership than repeated independent fixes.
• Remember: warranty repairs must be completed at a certified dealership to retain coverage and factory support.

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

• Check the instrument cluster for any explicit alerts or messages that may accompany the light — they can indicate hydrogen fueling or range notices specific to the Mirai.
• Look for obvious signs: loose or damaged fuel filler hardware, recent fueling irregularities, or warning icons that suggest a severe condition.
• If the light is flashing or accompanied by performance loss, stop driving and contact Nalley Toyota Stonecrest for immediate inspection and safe transport options.
• For warranty protection and correct repair, have any indicated service performed at a certified dealership by factory-trained technicians.

How long does a check engine light service take?

• Initial diagnostics commonly take 1–3 hours depending on code complexity and whether system-level tests or test drives are required.
• Simple fixes may be completed the same day; more involved repairs that require parts or extended testing will have a clearly quoted timeline.
• Because we use OEM tools and the right training for the 2025 Toyota Mirai, diagnostics are faster and more accurate, reducing repeat visits and long-term downtime.
• We prioritize efficiency and warranty compliance, delivering both immediate service value and lower total repair costs over time.

What is the most common reason for check engine light on a 2025 Toyota Mirai?

• Common causes include sensor malfunctions, oxygen or emissions sensor irregularities, and control module notices; hydrogen fuel system warnings may also trigger alerts unique to fuel-cell vehicles.
• Minor causes like loose or damaged filler hardware can trigger a light, but underlying electrical or sensor faults require a full scan to confirm.
• Left unresolved, small faults can cause increased wear or more expensive repairs; our service approach focuses on accurate diagnosis to avoid escalating costs.
• Warranty-covered items should be serviced at a certified dealership to ensure full coverage and correct OEM repair procedures.