Frequently Asked Questions

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

• Sensor faults — modern fuel cell vehicles like the 2025 Toyota Mirai rely on many sensors (oxygen, pressure, temperature, hydrogen leak detection). A failing sensor is a frequent trigger.
• Emissions and fuel cell stack issues — abnormalities in the fuel cell stack or catalyst-related components can illuminate the light.
• Electrical or software errors — software updates, ECU faults, or wiring/connectors can cause warnings even when drivability appears normal.
• Immediate dealer evaluation is recommended — our factory-trained technicians diagnose the root cause quickly and accurately, often saving you both immediate and long-term costs.
• Warranty-covered repairs must be done at a certified dealership to preserve coverage and ensure proper parts and procedures.

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

• It indicates the vehicle’s onboard diagnostics have detected a fault in emissions, fuel cell, powertrain, or related systems.
• The light can range from an advisory to a critical alert; it doesn’t always mean immediate failure, but it does require diagnosis.
• Our technicians use factory-grade tools to read codes and interpret manufacturer-specific data unique to the Mirai.
• Addressing the issue at Coggin Toyota at the Avenues often reduces total ownership costs versus delayed repairs, thanks to correct fixes performed once by factory-trained staff.
• For warranty-covered work, repairs must be performed at a certified dealership to remain eligible under manufacturer terms.

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

• Look for obvious signs — unusual noises, loss of power, warning messages, or fuel-cell system alerts on the dash.
• Ensure safety — if you detect the smell of hydrogen, unusual heat, or severe drivability loss, stop driving and have the vehicle towed to the dealership.
• Check dashboard messages — modern Mirai systems will often provide a supplemental message that helps prioritize urgency.
• Schedule a diagnostic with Coggin Toyota at the Avenues — our certified team pinpoints causes quickly, minimizing repair time and long-term expense.
• Remember: warranty repairs must be completed at a certified dealership to protect coverage and ensure correct procedures.

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

• Diagnostic fees vary, but most factory dealerships offer competitive, transparent pricing for code reading and system inspection.
• Coggin Toyota at the Avenues often costs less than independent shops when you factor in accurate diagnostics, genuine parts, and the right repair the first time.
• Immediate savings come from correct diagnosis and avoiding repeated repairs; long-term savings come from warranty protection and OEM parts longevity.
• If the repair is covered under warranty, the repair must be performed at a certified dealership to ensure coverage and quality.
• Contact our service center for a specific diagnostic estimate and any current service specials that lower upfront cost.

How long does a check engine light service take?

• Simple diagnostics (reading codes and summary inspection) are often completed within 30–60 minutes, depending on shop volume.
• More involved diagnostics or repairs—such as fuel cell system evaluation, sensor replacement, or software updates—can take several hours or require a scheduled appointment.
• Our factory-trained technicians use Toyota-spec tools and clearly communicate time estimates so you can plan accordingly.
• Choosing Coggin Toyota at the Avenues often reduces total time and cost by diagnosing correctly the first time and using genuine parts.
• If a repair is warranty-covered, it must be completed at a certified dealership to preserve warranty benefits and ensure proper documentation.