Frequently Asked Questions

How much does a check engine light diagnostic cost for a 1991 Toyota Cressida?

• Typical dealer diagnostics range from $80–$160 depending on scan, inspection time, and any road testing required.
• Nalley Toyota of Roswell often costs less than independent shops while providing factory-trained technicians, OEM tools, and genuine parts.
• Choosing our dealership delivers immediate savings through accurate diagnosis and correct repairs; long-term savings come from properly repaired components and sustained fuel and emissions performance.
• Remember: any repairs covered under warranty must be performed at a certified dealership to preserve coverage and ensure OEM-quality parts and labor.

What does it mean when the check engine light comes on in a 1991 Toyota Cressida?

• The light indicates the engine control module has detected a fault in emissions, ignition, fuel delivery, or engine management systems.
• Common flagged systems include oxygen sensors, ignition coils/plugs, vacuum leaks, catalytic converter efficiency, or mass airflow circuitry.
• At Nalley Toyota of Roswell we perform a full scan, interpret freeze-frame data, and advise on immediate vs. non-urgent issues so you can make an informed decision.
• When repairs are needed, our factory-trained technicians use OEM parts and documented procedures to protect long-term reliability and any applicable warranty coverage.

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

• Start with quick, visible checks: ensure the fuel cap is tight and undamaged—loose caps are a frequent, low-cost cause of codes.
• Scan the code promptly; even simple codes can mask progressive faults that increase fuel use or damage components if ignored.
• Check for obvious signs—smoke, smells, severe misfire, low oil or coolant—then bring your 1991 Toyota Cressida to Nalley Toyota of Roswell for a professional scan and inspection.
• Warranty-covered or complex repairs must be done at a certified dealership to maintain coverage and ensure correct repairs with OEM parts.

How long does a check engine light service take?

• Initial diagnostic scans and basic inspections typically take 30–90 minutes depending on code complexity and freeze-frame analysis.
• If parts or in-depth troubleshooting are required, total service time can extend to several hours or a day; our team provides clear time estimates before work begins.
• Nalley Toyota of Roswell prioritizes efficient, accurate service—reducing return visits and saving you time and money over independent shops by getting it right the first time.
• Any warranty-related repairs must be completed at a certified dealership to preserve coverage and ensure proper documentation and parts tracking.

What is the most common reason for check engine light on a 1991 Toyota Cressida?

• Common culprits include oxygen sensors, vacuum leaks, ignition components (plugs and coils), and aging catalytic converters.
• Fuel system issues—old injectors or weak fuel pressure—can also trigger codes and degrade performance and economy.
• Addressing these problems at Nalley Toyota of Roswell with OEM parts helps prevent secondary damage and yields long-term savings versus short-term fixes.
• If a repair is covered by warranty, it must be performed at a certified dealership to maintain coverage and ensure OEM-spec repairs.