Frequently Asked Questions

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

• Check the gas cap first — a loose or damaged cap commonly triggers an EVAP system code.
• Note any performance issues: rough idle, reduced power, or unusual noises help prioritize service.
• Record recent fueling or repairs and the light behavior (steady or flashing) before visiting us.
• If the light is steady, schedule a diagnostic; if flashing, stop driving and contact the dealership immediately.
• Remember: repairs covered under warranty must be performed at a certified dealership to remain valid.

How much does a check engine light diagnostic cost for a 2015 Toyota Highlander Hybrid?

• Diagnostics typically begin with an OBD-II scan to read stored codes and live data; pricing varies by issue.
• At Nalley Toyota of Roswell our diagnostic fees are competitive and often cost less than independent shops.
• Choosing our dealership delivers immediate savings through accurate diagnosis and long-term savings via correct repairs by factory-trained technicians.
• If repairs are covered under warranty, they must be completed at a certified dealership to preserve coverage.
• We provide clear estimates before repairs so you see both short- and long-term value in our service.

What does it mean when the check engine light comes on in a 2015 Toyota Highlander Hybrid?

• A steady light signals an emissions or sensor-related issue; common causes include O2 sensors, EVAP leaks, or misfires.
• A flashing light usually indicates an active misfire that can damage the catalytic converter if driven long-term.
• Hybrid system warnings may involve both gasoline and electric subsystems; our technicians diagnose hybrid-specific codes correctly.
• Timely dealership diagnostics reduce repair scope and cost by addressing root causes before secondary damage occurs.
• For warranty-related faults, repairs must be done at a certified dealership to ensure proper coverage and genuine parts.

How long does a check engine light service take?

• Initial diagnostic scans and inspections commonly take 30–90 minutes, depending on code complexity and live-data needs.
• Simple fixes, such as replacing a gas cap or clearing a false code after repair, can often be completed same day.
• More involved repairs—oxygen sensors, EVAP components, or misfire diagnosis—may require parts and additional testing, extending time to a day or more.
• Our certified technicians prioritize accurate repair to prevent repeat visits, which saves you time and money long-term.
• If covered under warranty, repairs must be completed at a certified dealership to maintain coverage and proper documentation.

What is the most common reason for check engine light on a 2015 Toyota Highlander Hybrid?

• Faulty oxygen sensors and EVAP system leaks are among the most frequent causes of an illuminated check engine light.
• Intermittent or persistent misfires (spark plugs, ignition coils) are common and can escalate if not promptly addressed.
• Hybrid-related sensors or battery system alerts can also trigger the light and require hybrid-trained diagnosis.
• Addressing these issues at our dealership often costs less than independent shops due to precise diagnostics and genuine parts.
• Remember: warranty-covered repairs must be performed at a certified dealership to ensure protection and quality results.