Frequently Asked Questions

What is the most common reason for check engine light on a 1998 Toyota Celica?

• Faulty oxygen sensor or mass air flow sensor causing fuel/air imbalance.
• Loose or damaged gas cap leading to an EVAP system error code.
• Ignition issues like worn spark plugs or coils creating misfire codes.
• These issues are often inexpensive to fix when addressed early, saving long-term repair costs.
• Repairs covered under warranty must be performed at a certified dealership like Nalley Toyota of Roswell.

What does it mean when the check engine light comes on in a 1998 Toyota Celica?

• It indicates the onboard diagnostics (OBD-II) detected a problem in emissions, engine, or drivetrain systems.
• Codes range from minor EVAP leaks to ignition misfires or catalytic converter faults.
• An illuminated light signals a stored trouble code; a flashing light signals a severe condition needing immediate attention.
• Prompt dealer diagnostics limit further damage and provide immediate and long-term savings compared with deferred repairs.

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

• Check the gas cap for proper closure and obvious damage; it’s a common and quick fix.
• Look for obvious signs: smoke, strange noises, or loss of power—don’t drive if present.
• Schedule a diagnostic scan with Nalley Toyota of Roswell to read stored codes and get an accurate repair plan.
• Warranty-covered repairs must be completed at a certified dealership to remain valid.

How much does a check engine light diagnostic cost for a 1998 Toyota Celica?

• Diagnostics typically include an OBD-II scan and technician inspection; pricing is competitive and transparent.
• Nalley Toyota of Roswell often costs less than independent shops while offering factory-trained technicians and genuine parts.
• Choosing dealer service provides immediate savings through accurate diagnosis and long-term savings by preventing unnecessary repairs.
• Any repair covered under warranty must be done at a certified dealership to ensure coverage.

How long does a check engine light service take?

• Initial diagnostic scans usually take 30–60 minutes; more complex diagnostics may require additional time.
• Minor repairs (sensors, gas cap, spark plugs) often completed same day; major repairs vary by parts and labor needs.
• Our service team provides accurate time estimates and works to minimize downtime with efficient scheduling.
• Dealer-performed repairs protect warranty coverage and often reduce long-term ownership costs.