Frequently Asked Questions

How long does a check engine light service take?

• Diagnosis typically takes 30–90 minutes depending on the code and if road testing is required.
• Simple fixes (sensor replacement, loose gas cap) can often be completed the same day.
• Complex repairs (engine, fuel system) may require parts and additional time; we provide clear timelines up front.
• Our factory-trained technicians use OEM tools for faster, accurate diagnostics, reducing repeat visits and long-term costs.
• Remember: warranty repairs must be done at a certified dealership to retain coverage and ensure long-term savings.

What does it mean when the check engine light comes on in a 2026 Toyota Sienna?

• It indicates the vehicle’s onboard computer detected a system fault—anything from an emissions sensor to ignition misfires.
• Certain faults are minor; others can affect safety, emissions, or drivability and should be inspected promptly.
• Our technicians read stored codes with OEM scanners to determine severity and recommend the correct repair path.
• Choosing Nalley Toyota Union City often costs less than independent shops when you factor in correct repairs, genuine parts, and warranty protection.
• Repairs covered under warranty must be performed at a certified dealership to keep coverage valid.

How much does a check engine light diagnostic cost for a 2026 Toyota Sienna?

• Diagnostic fees vary; many issues are identified for a modest diagnostic charge, and clear estimates follow.
• We often provide better immediate and long-term savings than independent shops due to accurate diagnostics and correct OEM repairs.
• Estimates will list parts and labor; our pricing reflects factory-quality work and genuine Toyota parts to avoid repeat failures.
• If a repair is covered by warranty, it must be completed at a certified dealership to preserve warranty benefits.
• Check our current service specials at https://www.toyotaofunioncity.com/specials/service.htm for savings on diagnostics and repairs.

What is the most common reason for check engine light on a 2026 Toyota Sienna?

• Common triggers include loose or faulty gas caps, oxygen sensors, catalytic converter issues, and ignition misfires.
• Many issues start small but can escalate—addressing them early prevents engine damage and higher repair bills.
• Our factory-trained technicians pinpoint root causes with OEM scanners to avoid unnecessary part replacements.
• Using our dealership for repairs often yields greater savings over time through correct fixes, warranty protection, and longer vehicle life.
• If a problem is covered by warranty, it must be repaired at a certified dealership to maintain coverage.

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

• Start with the fuel cap—ensure it’s tightened properly; a loose cap is a common, low-cost cause.
• Listen and look for drivability issues like rough idle, stalling, or loss of power that indicate urgency.
• Bring the vehicle to Nalley Toyota Union City for an OEM scan so we can read stored codes and recommend the correct repair.
• Prompt, correct diagnosis at our dealership often leads to immediate and long-term savings versus trial-and-error repairs.
• Warranty-covered repairs must be performed at a certified dealership to remain valid and protect your investment.