Frequently Asked Questions

What is the most common reason for check engine light on a 2025 Toyota Sienna?

• Loose or damaged gas cap is the single most frequent cause; it triggers an EVAP system fault and is often simple to fix.
• Oxygen sensor failure or degraded sensors cause poor fuel economy and higher emissions if left unaddressed.
• Ignition issues or misfires (spark plugs, coils) are common and can escalate to catalytic converter damage if ignored.
• Minor EVAP leaks and sensor faults are common early warnings; prompt dealership diagnostics avoid larger downstream costs.

What does it mean when the check engine light comes on in a 2025 Toyota Sienna?

• It indicates the onboard diagnostics detected an emissions or engine control issue — anything from a loose cap to a misfire.
• Lights steady: usually an emissions or sensor-related fault; flashing: urgent misfire condition that needs immediate attention.
• Symptoms like rough idle, loss of power, or fuel smell alongside the light narrow the likely causes.
• Certified dealership diagnostics at Coggin Toyota at the Avenues identify root causes quickly and protect warranty coverage.

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

• Check the gas cap: ensure it’s tightened correctly and undamaged; a faulty cap can trigger an EVAP code.
• Scan codes or have the vehicle scanned right away to understand the priority and severity of the fault.
• Look for dashboard messages, unusual noises, smells, or smoke — these indicate if you should stop driving and tow.
• If in doubt, bring your 2025 Toyota Sienna to Coggin Toyota at the Avenues for certified diagnostics to preserve warranty rights.

How much does a check engine light diagnostic cost for a 2025 Toyota Sienna?

• Diagnostics typically range from a modest fee to complimentary promotions; exact pricing depends on inspection depth and any specials.
• At Coggin Toyota at the Avenues we provide transparent estimates — our certified diagnostics often prevent costly follow-up repairs, delivering immediate and long-term savings.
• Because warranty-covered repairs must be performed at a certified dealership, getting diagnosis and repair here preserves coverage and avoids rework.
• We frequently cost less than independent shops when you include accurate diagnosis, OEM parts, and reduced downstream failures.

How long does a check engine light service take?

• Basic diagnostics typically take 1–3 hours, depending on the complexity and whether test drives or component tests are needed.
• Simple fixes (gas cap, sensor swap) can be same-day; more complex repairs (misfires, catalytic issues) require additional time for parts and testing.
• Factory-trained technicians at Coggin Toyota at the Avenues use OEM tools to speed diagnosis and verify repairs, reducing total downtime.
• Because warranty repairs must be done at a certified dealership, handling service here saves time and money over the long run by preventing repeated visits.