Frequently Asked Questions

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

• Check for obvious issues first: loose or missing gas cap, recent fueling, or visible fluid leaks.
• Inspect basic items like fluid levels and battery condition; some faults are simple and inexpensive to fix.
• For accurate diagnosis of a 2004 Toyota Celica, bring it to Nalley Toyota of Roswell for a professional scan to read OBD-II codes.
• Repairs covered under warranty must be performed at a certified dealership to protect your coverage and long-term savings.
• We often cost less than independent shops while providing factory-trained technicians and OEM parts for immediate and lasting value.

How long does a check engine light service take?

• Typical diagnostic scans take 30–60 minutes, depending on code complexity and test needs for your 2004 Toyota Celica.
• Simple repairs may be completed same day; complex repairs that require parts or further testing take longer.
• Our service team provides clear time estimates and prioritizes repairs to minimize downtime and cost.
• Using a certified dealer ensures proper repairs and preserves warranty benefits, reducing long-term repair costs.
• Schedule online or view service specials at https://www.toyotaofroswell.com/specials/service.htm for savings and faster appointment options.

How much does a check engine light diagnostic cost for a 2004 Toyota Celica?

• Diagnostic fees vary; many scans are competitively priced and some service promotions may offer reduced or waived diagnostic fees.
• At Nalley Toyota of Roswell, diagnostics often cost less than independent shops while delivering factory-trained technicians and OEM-level accuracy.
• Immediate savings come from accurate diagnosis—preventing unnecessary parts replacement—and long-term savings from warranty protection and proper repairs.
• If repairs are warranty-covered, they must be completed at a certified dealership to retain coverage and avoid out-of-pocket expense.
• Visit our service specials and schedule online to see current offers: https://www.toyotaofroswell.com/specials/service.htm

What is the most common reason for check engine light on a 2004 Toyota Celica?

• Common causes include oxygen sensor faults, catalytic converter efficiency issues, misfires, evaporative emissions leaks (loose fuel cap), and fuel trim problems.
• Many causes are minor when detected early; delaying repair can escalate costs (e.g., a failed catalytic converter is far more expensive than replacing an O2 sensor).
• Professional diagnostics at our dealership pinpoint the root cause quickly to save time and money.
• Repairs performed by certified technicians use OEM parts and protect warranty coverage for immediate and long-term savings.
• See our used inventory or bring your vehicle in from anywhere in the area: https://www.toyotaofroswell.com/used-inventory/index.htm

What does it mean when the check engine light comes on in a 2004 Toyota Celica?

• The light indicates the vehicle’s onboard diagnostics detected a fault—ranging from a loose gas cap to engine misfires or emissions system failures.
• It’s a prompt to scan the vehicle’s OBD-II codes to determine severity and required repairs.
• Some codes mean immediate action is needed to avoid further damage; others can be scheduled for routine repair.
• Bring your 2004 Toyota Celica to Nalley Toyota of Roswell for fast, accurate diagnostics and clear repair guidance from factory-trained technicians.
• Warranty repairs must be performed at a certified dealership to preserve coverage and ensure long-term savings.