Frequently Asked Questions

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

• Loose or damaged gas cap allowing fuel vapor leaks — a simple fix our technicians often correct during inspection.
• Oxygen sensor or mass air flow issues causing poor fuel trim and reduced efficiency.
• Evaporative emissions (EVAP) leaks, such as small hose cracks or valve faults.
• Occasional misfires from spark plugs or ignition coils; hybrids may also show battery or inverter-related codes.
• Our certified technicians identify root causes quickly, using OEM diagnostics and parts to maximize immediate and long-term savings.

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

• An illuminated light signals a stored trouble code — ranging from minor EVAP leaks to engine misfires or emissions control issues.
• It may indicate reduced fuel economy, higher emissions, or developing component failure if left unaddressed.
• For hybrids, it can also reflect battery, inverter, or hybrid-system irregularities that require specialized diagnostics.
• Bring the vehicle to Nalley Toyota Union City for a prompt scan; repairs at a certified dealership protect warranty coverage and long-term resale value.

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

• Confirm the gas cap is tightened and undamaged — an easy first step that resolves many alerts.
• Note any change in performance, strange noises, or dashboard warnings to share with the technician.
• Check basic items: fluid levels, battery connections, and recent fueling history.
• A quick dealer scan captures freeze-frame data and codes so we can prioritize repairs that save you money now and later.

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

• Diagnostic fees typically cover a computerized scan and technician time; typical ranges at our dealership start competitively and are explained upfront.
• Minor fixes like a gas cap or small EVAP repair often cost under a few hundred dollars; sensors or ignition work may run higher depending on parts.
• Addressing issues early prevents costly downstream repairs — for example, a failed catalytic converter can be far more expensive than timely sensor replacement.
• Nalley Toyota Union City often costs less than independent shops while providing factory-trained technicians, OEM parts, and documented service that preserves warranty and long-term value.
• Any repair covered under warranty must be performed at a certified dealership to ensure coverage — we handle warranty diagnostics and repairs according to Toyota standards.

How long does a check engine light service take?

• Initial diagnostic scans typically take 30–60 minutes, depending on the complexity and whether freeze-frame data needs analysis.
• Simple fixes can often be completed the same day; more involved repairs may require parts ordering and could take longer.
• We prioritize accurate diagnosis to avoid repeat visits — that approach delivers immediate savings and lowers lifetime repair costs.
• When warranty work is required, having the service done at Nalley Toyota Union City ensures proper documentation and preserves coverage.