Frequently Asked Questions

What is the most common reason for check engine light on a 2020 Toyota Highlander Hybrid?

• Misfires (spark plugs, ignition coils, or fuel delivery) are frequent causes and can reduce fuel economy and damage the catalytic converter.
• Faulty oxygen or mass air flow sensors often trigger codes that affect emissions and efficiency.
• Loose or leaking gas caps and EVAP system issues are common, inexpensive fixes that still require proper diagnosis.
• Addressing the root cause at our dealership saves money long term; delaying repairs can lead to far costlier components needing replacement.
• Warranty-covered repairs must be completed at a certified dealership to remain valid; our factory-trained technicians follow Toyota procedures.

What does it mean when the check engine light comes on in a 2020 Toyota Highlander Hybrid?

• It indicates the vehicle’s on-board diagnostics detected an issue with emissions, engine, or hybrid systems that needs investigation.
• The light can signal anything from minor EVAP leaks to engine misfires or sensor failures that affect performance and fuel economy.
• A steady light often means a non-urgent but necessary diagnostic; a flashing light signals an urgent condition that requires immediate attention.
• Having the vehicle inspected at Nalley Toyota of Roswell ensures accurate diagnosis, OEM parts, and keeps warranty coverage intact when applicable.

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

• Check for obvious issues: a loose gas cap, low oil level, or dashboard alerts that accompany the light.
• Record any changes in performance (stalling, rough idle, reduced power) and conditions when the light appeared.
• Bring the vehicle to our certified technicians for a diagnostic scan to read stored codes and determine next steps.
• Prompt dealership diagnosis often prevents escalation and delivers both immediate and long-term savings compared with delayed repairs.

How much does a check engine light diagnostic cost for a 2020 Toyota Highlander Hybrid?

• Diagnostic fees vary by region, but our dealership provides transparent pricing and often costs less than independent shops when you factor service quality and warranty support.
• An initial scan will identify stored codes; further inspection may be required for accurate repair estimates.
• Repair pricing depends on the fault—sensor replacements are typically lower cost, while catalytic converter or engine repairs are higher.
• Warranty-covered repairs must be performed at a certified dealership; choosing Nalley Toyota of Roswell protects coverage and can reduce long-term ownership costs.

How long does a check engine light service take?

• Simple diagnostics and minor fixes (like tightening a gas cap or replacing a sensor) can take one to two hours.
• Complex issues—misfires, internal engine concerns, or catalytic converter problems—may require extended diagnostic time and parts, sometimes a day or more.
• Our team provides time estimates after scanning codes and performing an initial inspection; we prioritize clear communication and efficient turnarounds.
• Using a certified dealership often yields faster, more accurate repairs and long-term savings by preventing repeat visits and protecting warranty coverage.