Frequently Asked Questions

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

• Inspect obvious items first: secure the hydrogen fill cap and check for visible leaks or loose fittings. A loose cap or connection can trigger a warning.
• Note any recent driving symptoms — reduced power, unusual noises, or smells — and record them for the service technician.
• Do a safe restart: pull over, turn the car off for a few minutes, then restart to see if the light persists.
• If the light remains or flashes, bring your 2021 Hyundai NEXO to our dealership promptly for a full diagnostic; warranty-covered repairs must be done at a certified dealership.

How long does a check engine light service take?

• Typical diagnostics for a 2021 Hyundai NEXO range from 30 minutes to 2 hours depending on code complexity and whether a road test is required.
• Minor resets or sensor checks can be completed quickly, while deeper issues requiring parts or fuel-system tests take longer.
• We provide transparent time estimates when you schedule; using our certified service center often reduces repeat visits and saves time in the long run.
• For warranty work, completing repairs at our dealership guarantees coverage continuity and uses factory-trained technicians who know your vehicle best.

How much does a check engine light diagnostic cost for a 2021 Hyundai NEXO?

• Diagnostic fees typically cover scanning, technician time, and initial troubleshooting; most diagnostics range from a modest flat fee to a slightly higher rate depending on depth of testing.
• At Courtesy Hyundai of Tampa we often cost less than independent shops while offering factory-level service, immediate diagnostics, and long-term savings due to correct repairs the first time.
• If the repair is covered under warranty, the diagnostic or repair cost will be handled per warranty terms and must be completed at a certified dealership.
• We provide an upfront estimate after diagnosis and recommend scheduling via our service scheduler to save time: /service/schedule-appointment.htm.

What does it mean when the check engine light comes on in a 2021 Hyundai NEXO?

• The light signals that an onboard diagnostic (OBD) sensor or system has detected an issue — from emissions control to electrical faults or sensor failures specific to fuel-cell and powertrain systems.
• Some causes are minor and avoid urgent action, while others require immediate attention to prevent damage or safety risks.
• Bringing your NEXO to our certified service center ensures correct diagnosis by technicians trained on Hyundai fuel-cell systems and protects warranty coverage.
• We focus on both immediate fixes and long-term savings, often costing less than independent shops due to efficient OEM processes and genuine parts.

What is the most common reason for check engine light on a 2021 Hyundai NEXO?

• Common triggers include sensor faults (emissions or electrical sensors), degraded components, or communication errors between modules — all detectable by OBD scanning.
• On fuel-cell vehicles like the NEXO, sensor and emissions-related codes are frequent; early diagnosis prevents escalation to more expensive repairs.
• Our dealership’s factory-trained technicians can pinpoint the root cause and recommend the right repair to maximize longevity and minimize cost.
• Remember: repairs covered under warranty must be performed at a certified dealership to maintain coverage and ensure high-quality parts and workmanship.