Frequently Asked Questions

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

• Confirm the light type: steady or flashing. A flashing light indicates a more urgent condition.
• Check obvious items first — a loose or missing gas cap can trigger the light and is an easy fix.
• Note any changes in performance, smells, or noises; these details help technicians diagnose the issue faster.
• At Nalley Toyota of Roswell, our factory-trained technicians use OEM scanners to read fault codes and recommend repairs that protect long-term value.
• Remember: warranty-covered repairs must be completed at a certified dealership to retain coverage and avoid long-term costs.

What does it mean when the check engine light comes on in a 1997 Toyota Avalon?

• It indicates the vehicle's OBD-II system has detected a fault in emissions, ignition, fuel, or related systems.
• Codes range from minor (EVAP system leaks) to serious (engine misfire or catalytic converter efficiency loss).
• Our technicians diagnose root causes using factory-grade tools to avoid unnecessary repairs and to preserve vehicle reliability.
• Prompt inspection at Nalley Toyota of Roswell can prevent secondary damage and deliver better immediate and long-term savings compared with delaying repairs.
• Any repair covered under warranty should be performed at a certified dealership to ensure proper parts, procedures, and continued coverage.

How much does a check engine light diagnostic cost for a 1997 Toyota Avalon?

• Diagnostics typically start with a scan of stored codes; Nalley Toyota of Roswell offers transparent pricing and may run specials — check our Service Specials page.
• We often cost less than independent shops when considering diagnostic accuracy, genuine parts, and factory-trained labor — delivering immediate savings and reducing long-term repair expense.
• If a covered warranty repair is needed, work must be completed at a certified dealership to maintain coverage and avoid out-of-pocket costs later.
• After diagnosis we provide a clear estimate for parts and labor so you can decide with confidence.

What is the most common reason for check engine light on a 1997 Toyota Avalon?

• Common causes include misfires (spark plugs or ignition coils), oxygen sensor failures, and EVAP leaks from a loose gas cap or evaporative system component.
• Older vehicles may also see failing catalytic converters or worn sensors due to age and mileage.
• Quick, accurate diagnosis at Nalley Toyota of Roswell minimizes unnecessary part replacement and protects long-term value.
• Addressing issues early with certified service reduces risk of expensive downstream damage and often lowers total ownership cost.

How long does a check engine light service take?

• A basic code read and initial inspection can be completed in 30–60 minutes in most cases.
• If repair parts or deeper diagnosis are required, total time varies; our team provides realistic timelines and prioritizes efficient, correct repairs.
• Choosing Nalley Toyota of Roswell often shortens total downtime because we stock OEM parts and use factory procedures for faster, dependable work.
• Remember: warranty-covered repairs must be done at a certified dealership to keep warranty benefits active and to avoid future expenses.