Frequently Asked Questions

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

• Inspect immediate basics: ensure the gas cap or hydrogen fueling port was secured after refueling—loose caps and fueling errors can trigger a light.
• Check dashboard for additional alerts that indicate urgent systems (coolant, traction, or battery) to prioritize safety.
• Note driving behavior and sounds: reduced power, unusual noise, or strange odors help technicians diagnose faster.
• Bring your 2023 Toyota Mirai to Nalley Toyota Stonecrest for a certified diagnostic—warranty-covered work must be performed at a certified dealership to remain valid.

How long does a check engine light service take?

• Typical diagnostic scans take 30–60 minutes; simple repairs can often be completed the same day depending on parts availability.
• Complex repairs that require parts ordering or multi-system diagnostics may take a day or more; our service advisors provide accurate timelines.
• Choosing Nalley Toyota Stonecrest often reduces overall downtime: our factory-trained technicians, dealer parts inventory, and streamlined processes deliver faster, reliable service than many independent shops.
• Warranty repairs must be completed at a certified dealership to ensure coverage and preserve long-term savings on future repairs.

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

• Common triggers include oxygen sensor or exhaust system issues, emissions control codes, and occasional misfire or fuel-system irregularities.
• For hydrogen fuel cell vehicles, electronics, sensors, and emission-monitoring components are frequent sources of alerts that require professional evaluation.
• Ignoring early warnings can escalate to expensive repairs—prompt dealer diagnosis protects key components and reduces long-term costs.
• Repairs covered under warranty must be performed at a certified dealership like Nalley Toyota Stonecrest to ensure coverage and maintain your savings.

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

• The check engine light indicates the vehicle’s onboard diagnostics detected a fault in emissions, powertrain, or sensor systems that needs evaluation.
• It can represent a range of issues—from minor sensor faults to conditions affecting drivability—so a code read is the first step.
• Our certified technicians perform thorough diagnostics, explain immediate and long-term cost impacts, and recommend repairs that protect your Mirai’s longevity and efficiency.
• Using Nalley Toyota Stonecrest helps you save over time through accurate repairs, factory parts, and warranty protection; warranty work must be done by a certified dealership.

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

• Diagnostic fees typically range from a modest flat rate for a scan to slightly higher for in-depth testing; exact pricing is provided when you schedule.
• At Nalley Toyota Stonecrest you often pay less overall than independent shops because our diagnostics identify the right repair the first time, and factory parts reduce repeat failures.
• Immediate savings come from accurate diagnostics and expedited repairs; long-term savings result from preserving warranty coverage and avoiding compounded damage.
• Remember: any repairs covered under warranty must be completed at a certified dealership to ensure the repair is honored and to protect your investment.