Frequently Asked Questions

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

• Check the gas cap for tightness and visible damage — a loose or cracked cap often triggers an EVAP code.
• Look for obvious signs: fluid leaks, smoke, burning odors, or dashboard warnings that accompany the light.
• Note recent fuel, fluid or performance changes and record any patterns to tell the technician.
• A quick visual and cap check can save time; if anything abnormal appears, bring it to Nalley Toyota of Roswell right away.
• Remember: warranty-covered repairs must be performed at a certified dealership to preserve coverage and long-term savings.

How much does a check engine light diagnostic cost for a 2020 Toyota Corolla Hatchback?

• Diagnostics typically include a full computer scan and technician inspection; many dealers offer competitive diagnostic pricing and specials.
• Nalley Toyota of Roswell often costs less than independent shops while delivering factory-trained technicians and genuine parts.
• Immediate savings come from accurate diagnosis and avoiding unnecessary repairs; long-term savings come from proper repairs that prevent repeat failures.
• If repairs fall under warranty, they must be completed at a certified dealership to maintain coverage and maximize your savings.
• Contact our service department for current diagnostic rates and available service specials.

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

• The light indicates the vehicle’s onboard diagnostics detected a fault in emissions, engine management, or sensors.
• Issues range from minor (loose gas cap, EVAP leak) to serious (misfire, catalytic converter damage) — severity dictates urgency.
• A steady light usually means schedule service; a flashing light often signals a severe condition requiring immediate attention.
• Our factory-trained technicians use Toyota factory scan tools to identify root causes quickly and precisely.
• Repairs covered by warranty must be performed at a certified dealership to preserve protection and long-term value.

What is the most common reason for check engine light on a 2020 Toyota Corolla Hatchback?

• One of the most common causes is an EVAP system issue — often a loose or damaged gas cap triggering a low-emission fault code.
• Spark plug or ignition coil issues that cause misfires are also frequent causes and can harm the catalytic converter if not addressed.
• Sensor failures (oxygen, MAF) and minor vacuum leaks appear regularly on compact hatchbacks and should be diagnosed promptly.
• Tackling common causes early at Nalley Toyota of Roswell lowers repair costs and helps maintain fuel economy and performance.
• Warranty-covered diagnostics and repairs must be completed at a certified dealership to ensure coverage and the best long-term savings.

How long does a check engine light service take?

• Typical diagnostic appointment times range from 30 minutes to one hour depending on codes and initial inspection complexity.
• If parts or deeper troubleshooting are required, repair times vary; many simple fixes are completed the same day.
• Nalley Toyota of Roswell schedules appointments to minimize wait times and offers clear estimates before work begins.
• Using factory tools and trained technicians speeds diagnosis and correct repair, reducing repeat visits and long-term cost.
• For warranty repairs, service must be performed at a certified dealership to preserve coverage and deliver long-term savings.