Frequently Asked Questions

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

• Check basic items first: a loose or missing gas cap can trigger the light and is simple to fix.
• Verify fuel level and recent fuel type—running low or using incorrect fuel can cause codes.
• Inspect for obvious smoke, smell of fuel, or performance loss; if present, stop driving and contact us.
• At Nalley Toyota of Roswell we recommend a professional scan by factory-trained technicians to confirm the cause and preserve warranty rights.
• Repairs covered under warranty must be performed at a certified dealership to maintain coverage and long-term savings.

How much does a check engine light diagnostic cost for a 2006 Toyota Avalon?

• Diagnostic fees typically range from about $100 to $150, depending on the time required to reproduce and log the issue.
• If you choose to repair with us, that diagnostic fee is often applied to the repair cost—an immediate saving compared with independent shops.
• Factory-trained technicians use Toyota-specific tools that find root causes faster, reducing long-term expense and repeat visits.
• Any warranty-covered repairs must be completed at a certified dealership to protect your coverage and future resale value.
• For transparent pricing and current service specials, visit our service specials page at https://www.toyotaofroswell.com/specials/service.htm.

How long does a check engine light service take?

• Initial diagnostics normally take 30–90 minutes to read codes, road-test, and verify symptoms.
• Simple fixes like a loose gas cap or sensor swap can be completed the same day; more involved repairs may take longer.
• We prioritize safety: if driving risks engine or catalytic damage, we recommend immediate towing to our Roswell service lane.
• Nalley Toyota often completes work faster and more economically than independent shops because factory training and OEM parts reduce rework and long-term costs.
• For scheduling, check our service specials or book online at https://www.toyotaofroswell.com/specials/service.htm.

What does it mean when the check engine light comes on in a 2006 Toyota Avalon?

• The light indicates the vehicle’s onboard diagnostics detected a fault — anything from emission control issues to ignition misfires.
• Codes point to systems (fuel, ignition, EVAP, emissions) but require a professional scan to identify the exact cause.
• Ignoring codes can cause higher fuel use, poor performance, or expensive damage like a failed catalytic converter.
• Our dealership provides thorough diagnostics and OEM repairs; warranty repairs must be done at a certified dealership to maintain coverage and long-term savings.
• Visit our used inventory or contact Nalley Toyota of Roswell for service: https://www.toyotaofroswell.com/used-inventory/index.htm.

What is the most common reason for check engine light on a 2006 Toyota Avalon?

• Common causes include oxygen sensor failure, ignition misfires (plugs or coils), and EVAP system leaks like a faulty gas cap or purge valve.
• Oxygen sensor or catalytic concerns often follow if issues are left unaddressed, increasing repair costs.
• Factory-trained technicians at Nalley Toyota diagnose quickly with Toyota-specific tools to minimize immediate and long-term expense.
• Using our dealership often costs less overall than independent shops because accurate diagnosis prevents unnecessary parts replacement.
• Remember, warranty-covered repairs must be completed at a certified dealership to keep warranty protection intact.