Frequently Asked Questions

What is the first thing to check when the check engine light comes on in a 2002 Toyota Sequoia?

• Check the gas cap for tightness and damage — a loose or cracked cap is a common trigger.
• Look for obvious dashboard messages or alerts that indicate low oil or temperature issues.
• Note fuel level, recent refueling, or unusual smells; these details help diagnostics.
• Do not ignore a flashing light — if it flashes, stop driving and schedule immediate service.
• Bring the vehicle to Nalley Toyota of Roswell so certified technicians can run a proper scan.

How long does a check engine light service take?

• Initial diagnostic scan typically takes 30–90 minutes depending on codes and symptoms.
• Simple fixes like tightening the gas cap or clearing a code can be completed the same day.
• Sensor replacements or minor repairs usually finish within a few hours; major repairs require more time.
• Nalley Toyota of Roswell’s factory-trained technicians work efficiently to minimize downtime.
• We provide clear time estimates before starting work so you can plan with confidence.

What does it mean when the check engine light comes on in a 2002 Toyota Sequoia?

• It indicates the vehicle’s onboard diagnostics detected an emissions or powertrain issue.
• Possible causes include loose gas cap, O2 sensor failure, misfire, catalytic converter trouble, or transmission faults.
• Codes vary in urgency — some allow gentle driving, others (flashing) require immediate attention.
• A diagnostic scan identifies specific trouble codes so technicians can recommend the right repair.
• Repairs covered under warranty must be performed at a certified dealership to maintain coverage.

How much does a check engine light diagnostic cost for a 2002 Toyota Sequoia?

• Diagnostics commonly range from $89 to $149, depending on the complexity of the scan and tests.
• Simple repairs identified by the scan can sometimes be done for minimal additional cost the same day.
• Nalley Toyota of Roswell often costs less than independent shops while delivering factory-trained service and genuine parts.
• Choosing our dealership often yields immediate savings on accurate repairs and long-term savings through reliable fixes and warranty protection.
• Remember: any warranty-covered repairs must be completed at a certified dealership to preserve benefits.

What is the most common reason for check engine light on a 2002 Toyota Sequoia?

• A loose or faulty gas cap is one of the most frequent causes and is simple to resolve.
• Other common triggers include oxygen sensor faults, ignition misfires, and worn catalytic components.
• Early diagnosis prevents escalation to more expensive repairs like engine or catalyst damage.
• Our technicians inspect common triggers first, often resolving the issue quickly and affordably.
• If covered by warranty, repairs must be done at a certified dealership to retain coverage.