Frequently Asked Questions

What is the first thing to check when the check engine light comes on in a 2025 Toyota Grand Highlander?

• Check the gas cap first — a loose or damaged cap is a common, easy fix that often clears the light.
• Verify fuel level and recent fueling events; low fuel or fill-ups with different grades can trigger codes.
• Quickly inspect oil and coolant levels; major low fluids can cause engine issues and warnings.
• If the light persists, bring the vehicle to Nalley Toyota Stonecrest for a factory diagnostic scan to read stored codes.
• Remember: if a repair is warranty-covered, it must be performed at a certified dealership to maintain coverage.

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

• Diagnostic fees vary; typical range at our dealership is competitive and often lower than independent shops for the value provided.
• Basic computer scans can be quick and affordable, while deeper diagnostics that require road tests or component checks cost more.
• Our factory-trained technicians use OEM tools to identify root causes, which helps avoid repeat work and saves money long-term.
• Any warranty repairs must be completed at a certified dealer like Nalley Toyota Stonecrest to keep coverage valid.
• Contact our service department for transparent estimates and service specials at /specials/service.htm.

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

• It indicates the vehicle’s onboard diagnostics system detected an emissions or engine performance issue that needs attention.
• Causes range from minor: loose gas cap or sensor misreadings, to major: misfires, catalytic converter or turbocharger-related faults.
• Some faults affect drivability and fuel economy; others primarily impact emissions but can lead to expensive repairs if ignored.
• Our dealership performs a full OEM diagnostic to pinpoint the trouble code and recommend repair options that maximize long-term savings.
• If repair falls under warranty, it must be done at a certified dealership to ensure proper coverage and parts traceability.

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

• Loose or faulty gas caps and oxygen sensors top the list for triggering warning lights.
• Other frequent causes include evap system leaks, ignition misfires, and failing catalytic converters if problems persist.
• Early diagnosis prevents escalation; minor sensor replacements are far less costly than catalytic converter or engine repairs.
• Nalley Toyota Stonecrest uses factory diagnostics and OEM parts to ensure repairs are done right the first time, reducing lifetime ownership costs.
• Warranty repairs must be completed at a certified dealer to preserve coverage and long-term savings benefits.

How long does a check engine light service take for a 2025 Toyota Grand Highlander?

• A basic diagnostic scan can take 30–60 minutes; many simple fixes are completed the same day.
• Repairs that require parts (sensors, hoses, gas cap) are often finished within a few hours or by the next business day.
• Complex issues such as catalytic converter replacement or engine work may take longer; we provide clear timelines before work begins.
• Our factory-trained technicians and streamlined parts network often deliver faster turnaround and better long-term value than independent shops.
• If a repair is covered by warranty, it must be performed at a certified dealership to maintain your warranty protection.