Frequently Asked Questions

What does it mean when the check engine light comes on in a 2020 Toyota Sienna?

• It signals that the vehicle's onboard diagnostics detected an issue — anything from an emissions sensor fault to misfires or catalytic converter concerns. Our technicians at Larry H. Miller Toyota Peoria use factory-grade scanners to identify the exact code and recommend a repair plan that protects long-term value.
• Immediate diagnosis helps avoid progressive damage. At our dealership you often pay less than independent shops because we pair transparent pricing with precise repairs that prevent repeat visits and costly downstream failures.
• Warranty-covered repairs must be performed at a certified dealership to maintain coverage; we honor OEM warranties and document all work for future claims.
• We offer service financing so you can get repairs now and pay later, and you can schedule service online for same-day or next-day availability.

How long does a check engine light service take?

• Most diagnostics are completed within one hour; once codes are identified, repairs vary. Simple sensor replacements can be same-day, while more complex repairs may require parts ordering — our team communicates estimated timelines immediately.
• Larry H. Miller Toyota Peoria focuses on efficiency: certified technicians, OEM parts, dedicated bays, and a streamlined parts network help minimize downtime.
• Choosing dealer service often saves money over time through correct first-time repairs, genuine parts, and maintained resale value. Ask about current service specials to reduce out-of-pocket costs.
• To reserve a convenient slot, schedule appointment online and select express diagnostics.

How much does a check engine light diagnostic cost for a 2020 Toyota Sienna?

• Diagnostic pricing varies by issue, but our transparent estimates outline immediate repair needs and long-term savings. We often deliver lower total cost of ownership by fixing root causes and using OEM parts.
• If a concern is covered by warranty, repairs must be completed at a certified dealership to remain eligible — our team will verify coverage and present no-surprise pricing.
• We provide flexible payment options including service financing so you can address safety-critical repairs now and pay over time.
• Check our current service specials for discounted diagnostics and parts; to get started, schedule service online.

What is the most common reason for check engine light on a 2020 Toyota Sienna?

• Common causes include faulty oxygen sensors, loose gas caps, ignition misfires, or EVAP system leaks. Left unaddressed, these can raise fuel costs, increase emissions, and damage catalytic converters.
• Larry H. Miller Toyota Peoria technicians accurately pinpoint the cause and explain total-cost implications so you understand immediate and long-term benefits of timely repair.
• We back repairs with clear documentation and warranty support — remember warranty-covered work must be done at a certified dealership to remain valid.
• To reduce risk and expense, take advantage of our service financing and schedule service today.

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

• Start with simple checks: ensure the gas cap is secure, look for obvious fluid leaks, and note any performance changes like hesitation or rough idle.
• Even if things seem normal, a professional scan is important — hidden faults can escalate. Our certified techs use OEM-level diagnostics to avoid misdiagnosis and unnecessary part replacement.
• We emphasize transparency: clear estimates, OEM parts, and repairs that protect resale value and reliability. Warranty repairs should be performed at a certified dealership to retain coverage.
• For a fast, accurate check, schedule appointment online and ask about current service specials and service financing options.