Frequently Asked Questions

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

• Start with simple items: ensure the gas cap is tightened, check fuel level, and inspect for obvious leaks or disconnected hoses.
• If you recently had fuel or maintenance, note that loose caps or recent fill-ups often trigger codes; a scan will confirm.
• Even for simple causes, we recommend a certified scan at Nalley Toyota of Roswell — covered repairs under warranty must be done at a certified dealership for protection and long-term savings.
• Our factory-trained technicians can quickly identify whether the issue is minor or requires immediate attention, often costing less overall than independent shops.

What does it mean when the check engine light comes on in a 2025 Toyota Prius Plug-In Hybrid?

• The light indicates a stored diagnostic trouble code detected by the vehicle’s computer — it can range from emissions items to hybrid-system events.
• Common causes include oxygen sensors, fuel trim issues, misfires, or hybrid battery/system alerts; severity varies by code.
• Prompt diagnosis at our dealership prevents escalation and higher repair bills; warranty-covered fixes must be performed at a certified dealer to remain valid.
• Nalley Toyota of Roswell delivers factory diagnostics and OEM parts, which often results in immediate and long-term savings versus off-premise repairs.

What is the most common reason for check engine light on a 2025 Toyota Prius Plug-In Hybrid?

• Common triggers include oxygen sensor faults, catalytic efficiency issues, and intermittent misfires; hybrid-specific codes can relate to battery charge or inverter performance.
• Left unchecked, these can damage the catalytic converter or hybrid components, increasing repair cost significantly.
• Our certified technicians identify the root cause quickly and perform warranty-eligible repairs when applicable — warranty work must be done at a certified dealership.
• Choosing Nalley Toyota of Roswell often means lower total ownership cost thanks to accurate diagnostics, OEM parts, and preventative care.

How much does a check engine light diagnostic cost for a 2025 Toyota Prius Plug-In Hybrid?

• Typical diagnostic fees range by complexity, commonly between $80 and $150 for a basic scan and code interpretation; hybrid-specific diagnostics can cost more if extended system tests are required.
• If your vehicle is under warranty, many diagnostic and repair items may be covered — warranty repairs must be done at a certified dealership like ours.
• Nalley Toyota of Roswell often provides better value than independent shops by preventing misdiagnosis and avoiding unnecessary parts, delivering immediate and long-term savings.
• We’ll provide a clear estimate before any work, and use OEM parts to protect performance and resale value.

How long does a check engine light service take?

• Simple scans and code reads can take 30–60 minutes; many common fixes are completed the same day depending on parts availability.
• Complex issues, hybrid-system diagnostics, or parts replacement may require several hours to a day; mileage, symptoms, and code history affect timing.
• We prioritize accurate, factory-standard repairs — warranty-covered repairs must be completed at a certified dealership to maintain coverage and long-term savings.
• Nalley Toyota of Roswell keeps you informed with precise timelines and cost-effective solutions performed by factory-trained technicians.