Frequently Asked Questions

What is the most common reason for check engine light on a 1994 Toyota 4Runner?

• Faulty or loose gas cap causing fuel vapors to escape and triggering an emissions fault.
• Oxygen sensor issues affecting fuel-air mix and fuel economy if left unattended.
• Worn ignition components (plugs, wires) that reduce performance and can damage catalytic converters.
• Minor problems may be low-cost to repair, while ignored issues can lead to higher long-term expenses.
• Repairs covered under warranty must be performed at a certified dealership to maintain coverage.

What does it mean when the check engine light comes on in a 1994 Toyota 4Runner?

• It signals the vehicle’s onboard diagnostics detected a system fault—anything from emissions to ignition.
• Light on steadily usually indicates a stored trouble code that needs diagnosis and repair.
• A flashing light means a severe condition that requires immediate attention to avoid damage.
• We use factory-grade scanners to read codes, giving a precise diagnosis and accurate repair estimate.
• Warranty-covered repairs must be completed at a certified dealership to ensure full protection.

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

• Verify the gas cap is secure and undamaged—this simple step resolves many emissions codes.
• Check for obvious issues: low oil, coolant leaks, or irregular engine noises that indicate urgent problems.
• Use an OBD-II code reader (or let our techs scan) to identify the stored code and next steps.
• For accurate, covered repairs and to protect warranties, have work performed at a certified dealership.
• Bringing your 1994 Toyota 4Runner to Nalley Toyota of Roswell ensures a factory-standard inspection and clear estimate.

How much does a check engine light diagnostic cost for a 1994 Toyota 4Runner?

• Diagnostic fees vary; our dealership provides transparent pricing and a clear written estimate before repairs.
• Minor fixes may be inexpensive, while complex repairs or parts replacement are priced competitively.
• Nalley Toyota of Roswell often costs less than independent shops, offering immediate and long-term savings with factory-trained technicians and OEM parts.
• Any repair covered under warranty must be performed at a certified dealership to preserve coverage.
• We recommend a diagnostic scan to avoid unnecessary repairs and to identify the most cost-effective solution.

How long does a check engine light service take?

• Simple diagnostics and minor repairs can often be completed the same day.
• More involved repairs—parts ordering or complex engine work—may take longer; we provide clear timelines up front.
• Factory-trained technicians and direct parts access help shorten turnaround and reduce repeat visits.
• Choosing Nalley Toyota of Roswell provides reliable scheduling and accurate completion estimates to minimize downtime.
• For warranty-covered work, scheduling at a certified dealership ensures proper documentation and prompt service.