Frequently Asked Questions

What is the most common reason for check engine light on a 2008 Toyota 4Runner?

• Loose or damaged gas cap — an easy, inexpensive fix that often clears the light.
• Faulty oxygen sensor or mass airflow sensor — affects fuel economy and emissions.
• Ignition misfires (spark plugs or coils) — can harm the catalytic converter if left unchecked.
• EVAP system leaks — common and typically moderate in repair cost if addressed early.
• Our certified technicians can diagnose correctly and often deliver lower total cost than independent shops while providing factory training and genuine parts.

What does it mean when the check engine light comes on in a 2008 Toyota 4Runner?

• It signals a detected fault in the engine, emissions, or drivetrain systems that needs diagnostic scanning.
• Causes range from minor (loose gas cap) to serious (misfire, catalytic converter damage).
• Ignoring the light can increase fuel use, emissions, and repair costs over time.
• Bring the vehicle to Nalley Toyota of Roswell for a proper scan — repairs covered by warranty must be done at a certified dealership.
• Our diagnostics prioritize immediate and long-term savings, with factory-trained technicians and OEM parts to protect value.

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

• Confirm the gas cap is tight and undamaged — a quick step that resolves many cases.
• Note any new symptoms (stuttering, reduced power, odd noises) to report to service staff.
• Check dashboard info and gauges for overheating or low oil indicators.
• If the light flashes or performance is affected, stop driving and contact our service center immediately.
• For reliable repairs and warranty protection, have Nalley Toyota of Roswell perform the diagnostic and any covered work.

How much does a check engine light diagnostic cost for a 2008 Toyota 4Runner?

• Diagnostic fees vary, but expect a transparent scan fee that is often competitive — call for current pricing.
• At our dealership, diagnostics are performed with OEM-grade scan tools for accurate results and long-term savings.
• If a repair is needed, we provide an estimate that highlights immediate and lifetime cost benefits of using factory-trained technicians and genuine parts.
• Many warranty-covered issues must be repaired at a certified dealership to maintain coverage — we handle those repairs efficiently.
• Choosing Nalley Toyota of Roswell can reduce overall repair risk and expense compared with unverified local options.

How long does a check engine light service take?

• Basic diagnostics typically take 30–60 minutes depending on symptoms and diagnostic depth.
• If parts or further testing are required, service time can extend to a few hours or a scheduled appointment day.
• We provide honest time estimates and prioritize repairs to minimize downtime and maximize long-term value.
• For warranty-covered repairs performed at our certified facility, we coordinate parts and labor to reduce repeat visits.
• Nalley Toyota of Roswell often completes work faster and with greater reliability than independent shops, delivering immediate and lasting savings.