Frequently Asked Questions

How much does a check engine light diagnostic cost for a 2024 Toyota Sienna?

• Standard diagnostic fees at our dealership are competitive and often cost less than independent shops, while delivering factory-trained technicians and genuine parts.
• Diagnostics typically include a full OBD-II scan, visual inspection, and a written estimate for repairs — so you see immediate and long-term savings by fixing the root cause correctly.
• Any repair covered under warranty must be performed by a certified dealership to preserve coverage; our service team will document findings and advise on warranty eligibility.
• Ask about current service specials and bundle pricing to reduce out‑of‑pocket expense; view offers at /specials/service.htm or contact our service advisors for details.

What does it mean when the check engine light comes on in a 2024 Toyota Sienna?

• A steady check engine light indicates the vehicle’s computer detected an emissions, fuel, or ignition system issue that needs evaluation.
• Common triggers include oxygen sensor faults, catalytic converter performance, ignition misfires, or EVAP leaks — each has different urgency and cost implications.
• Our dealership uses OEM-grade scan tools to identify stored codes and freeze-frame data, helping avoid unnecessary repairs and saving you money long term.
• If the issue falls under warranty, repairs must be done at a certified dealer to ensure coverage; we’ll handle authorization and high-quality service for you.

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

• Start with basic, quick checks: a loose or missing gas cap, visible fluid leaks, or obvious wiring damage around sensors.
• Performing a proper scan is next; our techs read trouble codes, review live data, and avoid guessing — this reduces repair cycles and saves money.
• If no simple cause is found, bring the vehicle to Nalley Toyota of Roswell for a certified diagnostic; repairs performed here maintain warranty and protect long-term value.
• We recommend not delaying service: early diagnosis prevents small issues from becoming costly failures such as catalytic converter damage or engine wear.

How long does a check engine light service take?

• Diagnostic scans and initial inspections commonly take 30–90 minutes, depending on code complexity and required system checks.
• Minor fixes (e.g., gas cap replacement, simple sensor swap) can often be completed the same day; more involved repairs may require parts ordering and a longer turnaround.
• Using a certified dealer often speeds accurate diagnosis and repair through OEM parts access and factory-trained teams, producing immediate and long-term savings.
• We provide clear time estimates at check-in and work to minimize downtime — schedule service or view specials at /specials/service.htm.