Frequently Asked Questions

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

• Check the gas cap: a loose or damaged cap is a common trigger and an easy fix.
• Confirm recent fuel: wrong fuel or a bad refill can cause codes; note when and where you last filled up.
• Inspect visible issues: low oil, coolant levels, or obvious leaks; address obvious problems immediately.
• Restart and monitor: if the light stays on, schedule a diagnostic with Nalley Toyota of Roswell for accurate scanning.
• Remember: warranty-covered repairs must be performed at a certified dealership to preserve coverage and long-term savings.

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

• Diagnostics typically range from an affordable flat fee to a modest service charge depending on tests required.
• Nalley Toyota of Roswell often costs less than independent shops while delivering factory-trained technicians and genuine parts.
• Choosing the dealership yields immediate savings through accurate diagnosis and long-term savings by avoiding misdiagnosis and improper repairs.
• Any repairs covered under warranty must be completed at a certified dealership to remain eligible for coverage and to avoid added expense later.
• We provide transparent estimates before repairs so you can weigh options and protect vehicle value.

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

• It signals the engine control unit detected a fault in emissions, engine, or hybrid systems; codes point to the subsystem affected.
• Possible causes include a loose gas cap, oxygen sensor, catalytic converter issues, ignition components, or hybrid-system warnings.
• Some faults are minor, but others can affect fuel economy, emissions, or drivetrain health—prompt diagnostics prevent escalation.
• Nalley Toyota of Roswell uses OEM-level scanning tools to identify exact codes and recommend the most cost-effective, warranty-compliant repair.
• For warranty-covered issues, certified-dealership repairs are required to preserve your protection and avoid unexpected costs.

How long does a check engine light service take?

• Basic code reading and initial inspection generally take 30–60 minutes, depending on workshop load and vehicle condition.
• If additional testing or component checks are needed, a full diagnostic may take a few hours to ensure a precise repair plan.
• Nalley Toyota of Roswell prioritizes accurate diagnosis to avoid repeat visits—this often saves time and money over the long run.
• Repairs timing varies by part availability; we can often source genuine Toyota parts quickly or recommend interim steps to keep you safe.
• If the issue is warranty-covered, repairs must be completed at a certified dealership to ensure coverage and quality workmanship.

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

• The most frequent cause is a loose or faulty gas cap, which lets vapors escape and triggers an emissions code.
• Other common causes include oxygen sensor failures, catalytic converter performance, and ignition component wear.
• Hybrid-specific warnings can stem from battery system sensors or related charging components; these require OEM-level diagnostics.
• Prompt service at Nalley Toyota of Roswell helps prevent costly downstream damage and leverages factory-trained technicians for accurate repair.
• Warranty repairs must be done here to preserve your coverage and secure immediate and long-term savings.