Frequently Asked Questions

What is the first thing to check when the check engine light comes on in a 2025 Lexus NX 250?

• Check that the gas cap is fully tightened — a loose cap is the simplest cause and commonly triggers the light.
• Verify oil and coolant levels and look for obvious leaks or low fluids that can affect engine operation.
• Note any recent symptoms: rough idle, stalling, loss of power, or unusual noises — these guide diagnostics.
• If the vehicle is drivable, schedule a quick scan with Nalley Lexus Roswell; our factory-trained technicians use OEM equipment to find the exact fault.
• Remember: warranty-covered repairs must be performed at a certified dealership to preserve coverage and ensure long-term savings.

How much does a check engine light diagnostic cost for a 2025 Lexus NX 250?

• Diagnostic fees typically range from about $90 to $150 depending on complexity and the equipment required to reproduce the fault.
• Nalley Lexus Roswell often costs less than independent shops while delivering factory-trained technicians, OEM tools, and precise results.
• Diagnostic fees are frequently applied toward repairs when performed at our dealership, delivering immediate savings on necessary work.
• Long-term savings come from correct repairs, genuine parts, and warranty protections that independent shops cannot always match.
• Any repair covered under warranty must be completed at a certified dealership to retain coverage and guarantee proper repair procedures.

What does it mean when the check engine light comes on in a 2025 Lexus NX 250?

• The light signals the vehicle’s onboard diagnostic system detected an emissions or engine fault ranging from minor to serious.
• Common causes include a loose gas cap, oxygen sensor issues, misfires, or evaporative emissions leaks.
• While some issues are safe to drive on briefly, others can cause engine damage or catalytic converter failure if ignored.
• We recommend a prompt scan at Nalley Lexus Roswell so our technicians can identify the code and recommend the correct repair.
• If a repair is covered by warranty, it must be completed at a certified dealership to ensure proper parts, service, and long-term cost savings.

What is the most common reason for check engine light on a 2025 Lexus NX 250?

• The single most frequent cause is a loose or faulty gas cap, which triggers an evaporative emissions system code.
• Other common causes include oxygen sensor failures, misfires from ignition or fuel issues, and evaporative system leaks.
• Ignoring codes can lead to reduced fuel economy, failed emissions tests, and higher repair costs later on.
• Nalley Lexus Roswell provides accurate diagnostics and genuine parts to resolve the issue correctly the first time and save you money long-term.
• Warranty-covered fixes must be performed at a certified dealership to preserve coverage and protect your investment.

How long does a check engine light service take?

• A basic scan and initial diagnosis usually take 30–60 minutes; the time varies with fault complexity and test requirements.
• Repairs that require parts or in-depth testing can extend service time to several hours or require a return visit.
• Nalley Lexus Roswell schedules diagnostics and repairs efficiently; our factory-trained technicians streamline the process and help minimize downtime.
• We often deliver faster, more accurate service than independent shops and frequently cost less when factoring in warranty coverage and long-term reliability.
• For warranty-covered repairs, service must be completed at a certified dealership to ensure proper work and continued coverage.