Frequently Asked Questions

How much does a check engine light diagnostic cost for a 2005 Toyota Highlander?

• Typical diagnostic fees range from a modest flat rate to around $100–$150 depending on test depth; parts and repairs are additional.
• Nalley Toyota of Roswell often costs less than independent shops while delivering factory-trained technicians and OEM parts — immediate savings on accurate diagnostics and long-term savings through correct repairs.
• If a repair is covered under a warranty, it must be completed at a certified dealership to preserve coverage and ensure correct OEM parts are used.
• We provide transparent estimates and can show how prompt dealership service prevents bigger, costlier issues later.

What does it mean when the check engine light comes on in a 2005 Toyota Highlander?

• The light signals the engine control module detected an emissions, ignition, fuel, or sensor issue — from a loose gas cap to misfires or oxygen sensor failures.
• Some faults are minor and easy to fix; others can affect performance, fuel economy, or catalytic converter health if left unchecked.
• Our diagnostics identify stored codes and real-time data so repairs target the root cause, saving you time and money over repeated attempts.
• Repairs covered under warranty must be completed at a certified dealership to maintain protection and ensure correct parts and procedures.

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

• Start with the gas cap: ensure it’s tightened until it clicks; a loose or damaged cap is a frequent cause and an inexpensive fix.
• Note any symptoms — rough idle, loss of power, smoke, or smells — and record when the light appeared; this helps our technicians diagnose quickly.
• Check dashboard messages and basic fluid levels, but avoid disconnecting sensors or clearing codes yourself — that can mask problems and void warranty claims.
• Bring your vehicle to Nalley Toyota of Roswell for a proper scan; our factory-trained team guarantees warranty-compliant repairs and long-term savings.

What is the most common reason for check engine light on a 2005 Toyota Highlander?

• The most common causes are a loose or faulty gas cap and oxygen sensor issues; both trigger emissions-related codes and affect fuel economy.
• Age-related items such as ignition coils, spark plugs, or the mass airflow sensor are also frequent culprits on older Highlanders.
• Nalley Toyota of Roswell diagnoses the true cause quickly to avoid unnecessary parts replacement and to protect your engine and emissions system.
• For warranty-covered items, repairs must be completed here or another certified dealership to retain coverage and ensure OEM standards are met.

How long does a check engine light service take?

• Basic diagnostics are often completed within 30–60 minutes; more involved troubleshooting or test drives can extend to 1–3 hours depending on symptoms.
• If parts are needed, repair time varies by complexity — simple replacements can be same-day; more complex repairs may require additional scheduling.
• Choosing Nalley Toyota of Roswell provides faster, more accurate service from factory-trained technicians using OEM tools, reducing repeat visits and long-term downtime.
• Warranty repairs must be performed at a certified dealership; we handle diagnostics, parts, and documentation to protect your coverage and provide immediate and lasting savings.