Frequently Asked Questions

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

• Check for obvious issues first: loose or damaged gas cap, low oil, or low coolant—simple items that can trigger a code.
• If the vehicle runs normally, schedule a diagnostic; we recommend OEM diagnostics to read stored codes and freeze-frame data.
• For any repairs covered under warranty, they must be performed at a certified dealership to preserve coverage and long-term savings.
• At Nalley Lexus Smyrna our factory-trained technicians confirm the root cause and avoid unnecessary part replacements, often costing less than independent shops over time.

How much does a check engine light diagnostic cost for a 2025 Lexus GX?

• Diagnostic fees vary by the issue, but typical in-dealership diagnostics begin around $100–$200 depending on tests required and time.
• We use OEM scan tools to identify codes precisely; this reduces guesswork and prevents repeat visits, delivering immediate savings.
• If repairs are needed and covered under warranty, completing them at our certified dealership ensures warranty protection and long-term cost benefits.
• Our service often costs less than independent shops when factoring correct repairs, diagnostics, OEM parts, and factory-trained technicians.

What does it mean when the check engine light comes on in a 2025 Lexus GX?

• The light indicates the vehicle’s onboard computer detected an emissions or engine performance issue; codes range from simple sensor faults to more serious malfunctions.
• A steady light usually signals a non-emergency condition—still requires prompt diagnosis to avoid escalation.
• A certified dealership can pull the code, interpret data, and recommend OEM repairs that protect vehicle value and warranty eligibility.
• Addressing issues early at Nalley Lexus Smyrna delivers immediate and long-term savings through accurate repairs and reduced risk of catalytic or engine damage.

How long does a check engine light service take?

• Initial code retrieval and inspection commonly take 30–60 minutes; more complex diagnostics or test drives may extend the visit.
• If a simple fix is identified, many repairs can be completed the same day; other repairs may require parts and scheduled service time.
• We prioritize accurate, OEM-compliant repairs performed by factory-trained technicians to minimize repeat work and long-term costs.
• When warranty work is involved, repairs must be completed at a certified dealership to maintain coverage and ensure cost savings over time.

What is the most common reason for check engine light on a 2025 Lexus GX?

• Common causes include misfires, oxygen sensor faults, catalytic converter efficiency, and EVAP system leaks—each can trigger fault codes.
• Misfires or sensor failures can reduce fuel economy and damage emission components if left unaddressed.
• Nalley Lexus Smyrna uses OEM diagnostics to pinpoint the root cause quickly and recommend the correct repair for long-term savings.
• Repair work covered under warranty must be completed at a certified dealership to protect coverage and vehicle resale value.