Frequently Asked Questions

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

• Check the gas cap: a loose or damaged cap is a common, low-cost cause that can trigger the light.
• Look for obvious signs: unusual smells, smoke, or loss of power—these require immediate attention.
• If the light is flashing, stop driving and contact us right away—flashing often signals a serious misfire.
• Bring your 2024 Toyota Corolla to Nalley Toyota of Roswell for a thorough scan; warranty-covered repairs must be performed at a certified dealership.
• Choosing our dealership often costs less than independent shops over time because we diagnose precisely, use genuine parts, and prevent repeat repairs.

How much does a check engine light diagnostic cost for a 2024 Toyota Corolla?

• Diagnostic fees vary by complexity; typical ranges are $90–$150 for a standard code read and initial inspection.
• At Nalley Toyota of Roswell we provide competitive rates and transparent estimates—diagnostic fees are often applied toward required repairs.
• Because we use factory tools and genuine Toyota parts, customers often save immediately and long-term through accurate repairs and fewer return visits.
• Remember: repairs covered under warranty must be completed at a certified dealership to maintain coverage and ensure proper reimbursement.

What does it mean when the check engine light comes on in a 2024 Toyota Corolla?

• The light signals the vehicle’s onboard diagnostics have stored a fault code—causes range from simple (loose fuel cap) to complex (misfire or catalyst issues).
• Common culprits include oxygen sensors, evaporative emissions leaks, ignition coils, spark plugs, and catalytic converter efficiency faults.
• Our technicians perform a full scan, interpret codes, and recommend repairs with clear pricing and timelines to maximize long-term savings.
• Warranty-covered diagnostics or repairs must be performed at a certified dealership to preserve your protections and ensure correct parts and procedures.

What is the most common reason for check engine light on a 2024 Toyota Corolla?

• A loose or faulty gas cap is the most frequent—and easiest to fix—cause of a check engine light on the 2024 Toyota Corolla.
• Other frequent reasons include worn oxygen sensors and ignition misfires from spark plugs or coils.
• Addressing issues early at Nalley Toyota of Roswell reduces the risk of costly secondary damage, delivering both immediate and long-term savings.
• For any warranty-related fault, repairs should be completed at a certified dealership to ensure coverage and the use of genuine Toyota parts.

How long does a check engine light service take?

• A basic code read and initial inspection typically takes 30–60 minutes; more complex diagnostics and repairs vary by cause.
• Many repairs—such as replacing a gas cap, oxygen sensor, or spark plugs—can often be completed same day with parts on hand.
• Nalley Toyota of Roswell uses streamlined processes and factory diagnostics to minimize downtime and reduce repeat visits, which lowers overall ownership cost.
• If a repair is covered under warranty, having it performed at our certified dealership ensures proper processing and long-term protection.