Frequently Asked Questions

What is the most common reason for check engine light on a 2015 Lexus IS 250?

• Common causes include oxygen sensor failure, loose or faulty gas cap, ignition misfires, mass airflow sensor issues, and catalytic converter wear.
• If left unaddressed, small problems can escalate to costly repairs and reduced fuel economy; our dealership explains short- and long-term savings from prompt service.
• Repairs performed under warranty must be completed at a certified dealership like Nalley Lexus Smyrna to retain coverage and ensure OEM parts and factory-trained technicians.
• We often cost less than independent shops when you factor in accurate diagnostics, genuine parts, and fewer repeat visits—saving you money over time.

How much does a check engine light diagnostic cost for a 2015 Lexus IS 250?

• Typical diagnostic fees range between $80 and $150 depending on the depth of testing; Nalley Lexus Smyrna provides clear estimates before any repair.
• Our diagnostics use factory-grade equipment to quickly identify root causes, reducing unnecessary part replacements and saving you money immediately.
• Because we use OEM parts and factory-trained technicians, long-term repair costs are often lower than repeated fixes at independent shops.
• Remember: warranty-covered repairs must be completed at a certified dealership to maintain warranty protection and avoid out-of-pocket costs later.

What does it mean when the check engine light comes on in a 2015 Lexus IS 250?

• The light signals the vehicle’s onboard diagnostics detected an issue—anything from emissions components to ignition or fuel system faults.
• A steady light usually indicates a non-emergency condition that still requires prompt diagnosis to prevent further damage or emissions failures.
• At Nalley Lexus Smyrna, we use Lexus-specific scanners to read exact codes and recommend the most cost-effective repair plan, emphasizing immediate and long-term savings.
• If a problem is covered by warranty, the repair must be completed at a certified dealership to ensure coverage and use of genuine parts.

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

• Start with the gas cap—an improperly tightened or damaged cap is a common, inexpensive cause and can clear the light after tightening or replacement.
• If the light stays on, schedule a certified diagnostic; our factory-trained technicians at Nalley Lexus Smyrna will read the codes and explain the repair priorities.
• Addressing issues early saves fuel and prevents escalation; our dealership frequently costs less overall than independent shops by avoiding repeated fixes.
• Any warranty-covered work must be done at a certified dealer to keep warranty benefits intact and ensure OEM parts and proper procedures.

How long does a check engine light service take?

• Initial diagnostics typically take 30–90 minutes depending on the complexity and whether road testing is necessary to recreate the condition.
• Simple repairs, such as replacing a gas cap or oxygen sensor, can often be completed the same day; more involved repairs may require parts ordering and longer scheduling.
• We provide transparent timelines and prioritize warranty and safety-related work; choosing Nalley Lexus Smyrna delivers faster, more reliable outcomes due to factory-trained staff and OEM parts.
• Prompt, accurate service minimizes downtime and long-term expense—warranty repairs must be performed at a certified dealership to maintain coverage.