Frequently Asked Questions

How long does a check engine light service take?

• Typical diagnostic appointments run 30–60 minutes for a full scan and code interpretation by our factory-trained technicians.
• Simple fixes (loose gas cap, small evap leak) can be resolved the same day; more complex repairs may require parts and additional time.
• We provide an immediate estimate and timeline; choosing Nalley Lexus Roswell often costs less than independent shops due to accurate diagnostics and fewer repeat visits.
• Repairs covered under warranty must be completed at a certified dealership to preserve coverage and ensure OEM parts.

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

• Start with the simple checks: secure the gas cap and look for obvious fluid leaks or smells.
• Use a diagnostic scan tool to read codes — our service department offers fast code retrieval and explanation.
• If the vehicle runs normally, schedule a diagnostic quickly; small issues can escalate into costly repairs if ignored.
• For warranty-covered concerns, remember repairs must be performed at a certified dealership to retain coverage and long-term savings.

What does it mean when the check engine light comes on in a 2012 Lexus IS 350 C?

• The light signals a fault detected by the engine control unit — anything from emissions systems to ignition, fuel, or sensor issues.
• Certain codes indicate immediate problems (misfires, catalytic efficiency) while others point to maintenance items (oxygen sensor, evap leaks).
• Our technicians interpret codes in context, diagnosing root causes to avoid unnecessary parts replacement and save you money over time.
• Warranty-covered diagnostics and repairs should be done at a certified dealership to ensure coverage and use of OEM parts.

How much does a check engine light diagnostic cost for a 2012 Lexus IS 350 C?

• Diagnostic prices vary, but Nalley Lexus Roswell offers transparent, competitive rates and often costs less than independent shops because of precise diagnosis and fewer follow-up visits.
• If repairs are needed, we provide an itemized estimate outlining immediate and long-term savings versus delaying service.
• Warranty repairs must be performed at a certified dealership; performing them with us protects coverage and reduces your total ownership cost.
• Ask about current service specials and available financing to lower out-of-pocket expense while ensuring OEM parts and factory-trained care.

What is the most common reason for check engine light on a 2012 Lexus IS 350 C?

• Common triggers include ignition misfires, oxygen sensor failures, catalytic converter efficiency issues, and evap system leaks.
• Ignition misfires can damage the catalytic converter if left unchecked; timely diagnosis avoids much higher future costs.
• Our factory-trained technicians use Lexus-grade tools to pinpoint causes and recommend the most cost-effective repair path.
• For warranty-covered problems, repairs must be performed at a certified dealership to protect your coverage and long-term value.