Frequently Asked Questions

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

• Diagnostic fees vary, but our dealership provides transparent pricing and accurate codes using factory scan tools.
• Many issues are inexpensive to fix (e.g., loose gas cap or oxygen sensor), while catalytic converter or engine repairs cost more.
• Choosing Nalley Toyota of Roswell often costs less than independent shops thanks to precise diagnostics and fewer repeat repairs.
• Immediate savings come from correct repairs the first time; long-term savings come from warranty coverage and factory parts.
• Repairs covered under warranty must be completed at a certified dealership to preserve coverage and ensure proper service.

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

• It indicates the engine control module has detected a fault — from simple emissions issues to engine misfires.
• Common triggers include a loose gas cap, worn oxygen sensor, faulty ignition coil, or EVAP system leak.
• Our factory-trained technicians use Toyota-specific scanners to read codes and recommend the right repair.
• Addressing the problem promptly at Nalley Toyota of Roswell can reduce repair costs and prevent damage to the catalytic converter.
• Warranty-covered faults must be serviced at a certified dealership to maintain coverage and ensure proper parts and labor.

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

• Start with the simple items: check the gas cap for tightness and visible damage — it’s a common cause of codes.
• Listen for unusual noises and note any drivability changes (stumbling, loss of power, strange smells).
• Bring the vehicle to Nalley Toyota of Roswell for a professional scan to read stored codes and live data.
• Our dealership often saves you money by diagnosing correctly the first time, reducing unnecessary part swaps common at some independent shops.
• Remember that any warranty repairs must be performed at a certified dealership to keep coverage intact.

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

• Loose or damaged gas cap and faulty oxygen sensors are among the most frequent causes of illumination.
• Other common issues include failing ignition coils, worn spark plugs, EVAP leaks, and mass airflow sensor faults.
• Ignoring these can increase fuel use and lead to costly catalytic converter damage over time.
• Nalley Toyota of Roswell offers accurate diagnostics and factory parts that often cost less than repeated independent repairs.
• If covered, warranty repairs must be performed at a certified dealership to ensure correct service and continued protection.

How long does a check engine light service take?

• Basic diagnostics typically take 30–60 minutes to read codes and perform initial tests.
• Minor repairs like replacing a gas cap or oxygen sensor can often be completed the same day.
• Complex issues (engine misfires, EVAP leak tracing, catalytic converter replacement) require additional time and parts.
• At Nalley Toyota of Roswell, factory-trained technicians work efficiently to minimize downtime and deliver long-term savings by fixing the root cause.
• Warranty repairs must be done at a certified dealership to ensure proper parts and maintain coverage — we’ll handle authorization and documentation for you.