Frequently Asked Questions

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

• Check for obvious issues first: a loose or missing gas cap, low fuel, or visible fluid leaks under the vehicle.
• Listen and feel: hesitation, rough idle, or loss of power can narrow the cause and indicate urgency.
• Do a quick battery and charging check—electrical problems can trigger codes unrelated to the engine itself.
• Bring the vehicle to Toyota of Greenville for a free scan; factory-trained technicians will diagnose and recommend repairs.
• Remember: if the repair is warranty-covered, it must be completed at a certified dealership to preserve coverage.

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

• Typical diagnostic scans can range from a complimentary basic scan to a paid diagnostic starting around $90–$150 depending on complexity.
• Repairs vary: sensor replacements are generally economical, while catalytic or turbo repairs cost more—estimates provided after diagnosis.
• Toyota of Greenville often costs less than independent shops by combining competitive pricing with factory-trained technicians and genuine parts.
• Choosing our dealership delivers immediate savings through accurate diagnosis and long-term savings by preventing costly secondary damage.
• Any warranty-covered repairs must be done at a certified dealership to maintain warranty protection and ensure OEM parts are used.

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

• A check engine light indicates the vehicle’s onboard diagnostics detected a parameter outside normal range—anything from an O2 sensor to a misfire.
• It may signal minor issues (evap leak, loose cap) or serious problems (misfires, catalytic degradation, turbo faults) that need inspection.
• Immediate scanning at Toyota of Greenville identifies stored codes and live-data to prioritize safe, cost-effective repairs.
• Addressing the cause quickly prevents increased fuel use, emissions failures, and expensive component damage down the road.
• Warranty repairs should be performed at certified dealerships to preserve coverage and use genuine Toyota parts.

How long does a check engine light service take?

• Initial diagnostic scans typically take 30–90 minutes depending on symptoms and live-data review.
• Minor repairs (sensor replacement, evap repairs) are often completed within a few hours the same day.
• More complex repairs—turbo, catalytic converter, or engine work—may require one to several days for parts and technician time.
• Toyota of Greenville offers efficient scheduling, factory tools, and trained technicians to minimize downtime and deliver accurate repairs.
• If a repair is under warranty it must be completed at a certified dealership to ensure proper documentation and coverage.

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

• Common causes include evap system leaks (loose gas cap or hose), oxygen or temperature sensor faults, and occasional cylinder misfires.
• Turbo-related underboost codes can appear on turbocharged engines if boost control or intake systems develop issues.
• Untreated misfires or sensor failures can damage the catalytic converter—an expensive downstream consequence.
• Toyota of Greenville’s factory-trained techs use OEM diagnostics to pinpoint the root cause quickly and recommend cost-effective solutions.
• Warranty repairs must be performed at a certified dealership to maintain coverage and ensure genuine Toyota parts are used.