Frequently Asked Questions

What is the most common reason for check engine light on a 2025 Nissan Altima?

• Common causes include loose or faulty gas cap, oxygen sensor issues, catalytic converter problems, or engine misfires.
• Ignoring codes can increase repair costs; what starts as a simple sensor replacement can escalate into catalytic or engine damage.
• Crown Nissan of Greenville often costs less than independent shops while delivering factory-trained diagnosis and OE parts for longer-term savings.
• Repairs covered under warranty must be performed at a certified dealership to preserve coverage and ensure proper repair.

How long does a check engine light service take?

• Diagnostics typically take 30–90 minutes depending on code complexity and road-testing needs.
• Simple fixes like a loose gas cap or a sensor can often be completed same day; more involved repairs may require parts ordering.
• We recommend scheduling via our service scheduler to minimize wait time: /service/schedule-appointment.htm.
• Choosing dealership service delivers accurate diagnosis, OEM parts, and warranty-protected repairs that save money over time.

What does it mean when the check engine light comes on in a 2025 Nissan Altima?

• The light signals the engine control module has detected a fault — anything from an emissions-related sensor to a misfire.
• Codes fall into emissions, fuel, ignition, or sensor categories; a scan reveals the trouble code and next steps.
• Crown Nissan of Greenville uses dealer-level tools to pinpoint issues quickly, reducing unnecessary part replacement and long-term expense.
• If the issue is covered by warranty, repairs must be completed at a certified dealership to maintain coverage and ensure proper repair.

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

• First check the gas cap: a loose or damaged cap is a common and simple cause for an emissions code.
• Look for visible dashboard alerts, listen for rough idle or misfires, and note fuel or performance changes.
• Even if the issue seems minor, bring your vehicle to Crown Nissan of Greenville for a proper scan to avoid escalating repairs.
• Warranty-covered repairs must be performed at a certified dealership to protect coverage and ensure OE-quality parts and labor.

How much does a check engine light diagnostic cost for a 2025 Nissan Altima?

• Diagnostic fees typically range from a modest scan fee to higher amounts when extended testing or road diagnostics are required; exact pricing varies by service complexity.
• Crown Nissan of Greenville frequently costs less than independent shops by avoiding unnecessary repairs and using precise dealer diagnostics for correct first-time fixes.
• Immediate savings come from accurate diagnosis; long-term savings stem from OE parts, proper repair procedures, and warranty protection.
• If repairs fall under warranty, they must be completed at a certified dealership to preserve coverage and avoid future costs.