Frequently Asked Questions

What is the first thing to check when the check engine light comes on in a 2020 Toyota Mirai?

• Verify the vehicle is safe to drive: note unusual noises, loss of power, or dashboard warnings and pull over if the car feels unsafe.
• Check for obvious issues: loose items under the hood, a disconnected sensor or a low 12V battery can trigger a fault code.
• Record symptoms: note when the light came on, driving conditions, and any recent fuel or service events to help technicians diagnose faster.
• Bring it to a certified dealership: repairs covered under warranty must be performed at a certified dealership to remain valid and protect long-term value.

How long does a check engine light service take?

• Typical diagnostic appointments range from 30 minutes to 2 hours depending on symptom complexity and scan results.
• Simple sensor reads and resets can be completed quickly; more involved repairs or parts orders extend turnaround time.
• At Coggin Toyota at the Avenues, factory-trained technicians and OEM tools speed accurate diagnosis and often reduce overall time and cost versus multiple visits.
• We prioritize immediate and long-term savings—diagnostics are efficient, and warranty-covered repairs must be done at a certified dealership for full coverage.

How much does a check engine light diagnostic cost for a 2020 Toyota Mirai?

• Diagnostic fees typically range from $100 to $200, depending on the depth of testing required and whether additional inspections are needed.
• At our dealership, diagnostics are performed with OEM-grade equipment; many times the diagnostic fee is applied to the repair if you choose us for service, delivering immediate savings.
• Doing service with Coggin Toyota at the Avenues often costs less than independent shops over time because we prevent repeat repairs and protect warranty coverage.
• Remember, any repairs covered under warranty must be completed at a certified dealership to ensure parts, labor and coverage remain intact.

What does it mean when the check engine light comes on in a 2020 Toyota Mirai?

• The light indicates the vehicle’s onboard diagnostics have detected a fault in emissions, sensors, or the electric/fuel cell drive systems that affect performance or efficiency.
• It can range from minor sensor faults to issues that affect range or the fuel cell stack—prompt diagnosis prevents escalation and costly repairs.
• Factory-trained technicians at Coggin Toyota at the Avenues use specialized tools to pinpoint faults quickly, minimizing downtime and delivering long-term savings.
• Warranty-covered issues must be serviced at a certified dealership to preserve coverage and ensure proper OEM repair procedures.

What is the most common reason for check engine light on a 2020 Toyota Mirai?

• Common triggers include sensor faults (air, pressure, temperature or electrical connectors) and issues detected in emissions or drivetrain components.
• On hydrogen fuel cell vehicles like the Mirai, alerts may relate to fuel cell system sensors, air intake components, or control electronics rather than traditional gasoline faults.
• Ignoring these codes can reduce range, increase wear, and lead to expensive repairs of high-value components; timely dealer service helps avoid that cost escalation.
• Certified dealership servicing protects warranty status and leverages factory training for accurate, lasting repairs and lower total ownership costs.