Frequently Asked Questions

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

• Diagnostic fees typically range from $80–$150 depending on inspection depth and test drives; exact pricing available when you schedule.
• Nalley Toyota Union City often costs less than independent shops while delivering higher-level service from factory-trained technicians—providing immediate savings on accurate diagnostics and long-term savings by preventing misdiagnosed repairs.
• If repairs are covered under warranty, they must be performed at a certified dealership to ensure coverage; we handle warranty claims directly for a smoother, no-surprise experience.
• We provide clear, itemized estimates before work begins so you can compare repair options and avoid unnecessary services.

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

• The light can indicate anything from a loose gas cap to emissions sensor faults, ignition misfires, or catalytic converter issues; it flags the vehicle’s onboard diagnostics for attention.
• It does not always mean imminent engine failure, but it does require prompt evaluation to avoid larger repairs, reduced fuel economy, or failed emissions tests.
• Our factory-trained technicians use Toyota-specific scanners to read codes and recommend only necessary repairs, which often saves you money versus trial-and-error fixes at independent shops.
• Any repairs covered under warranty must be completed at a certified dealership to preserve coverage—our service advisors will guide you through that process.

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

• Start with simple items: ensure the gas cap is tight and inspect for obvious fuel odors—loose caps are a common and quick fix.
• If the cap is secure, schedule a diagnostic so trained technicians can pull codes with Toyota-approved equipment and determine whether it’s a sensor, ignition, or emissions issue.
• Bringing the vehicle to Nalley Toyota Union City often provides immediate and long-term savings: accurate diagnosis prevents unnecessary parts replacement and protects factory warranties.
• We provide transparent estimates and explain if warranty work applies; remember warranty repairs must be done at a certified dealership to remain valid.

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

• The most frequent causes include faulty oxygen sensors, loose or damaged gas caps, ignition misfires, and failing catalytic converters or EVAP system faults.
• Often the issue is an emissions-related sensor; addressing it early avoids poor fuel economy, failed emissions inspections, and larger component damage.
• Nalley Toyota Union City’s technicians diagnose with OEM tools to pinpoint the cause quickly—delivering long-term savings by preventing cascading failures.
• If a repair is covered by warranty, it must be completed at a certified dealership; we handle warranty paperwork and repairs to keep the process seamless.

How long does a check engine light service take?

• Basic code retrieval and inspection typically take 30–60 minutes; more complex diagnostics or test drives may require 1–3 hours depending on symptoms.
• If parts or deeper testing are needed, our advisors will give a time estimate and explain options to get you back on the road quickly.
• Using our dealership often reduces total downtime because we have direct access to Toyota parts, specialized equipment, and factory-trained technicians—saving you both time and money versus repeated visits to independent shops.
• Any warranty-covered repair must be done at a certified dealership to maintain coverage; we prioritize efficient scheduling and clear communication throughout the service.