Frequently Asked Questions

How much does a check engine light diagnostic cost for a 2015 Lexus IS 350 C?

• Typical dealer-grade scan and basic diagnostic: $80–$150, depending on depth and drive testing.
• Advanced diagnostics or intermittent faults may require longer inspection and additional charges; we disclose costs before work begins.
• Nalley Lexus Roswell often costs less than independent shops while delivering higher service levels, factory tools and genuine parts.
• Immediate savings come from accurate diagnosis and correct repairs; long-term savings come from avoiding repeat work and protecting warranty coverage.
• Any repairs covered under warranty must be performed at a certified dealership to preserve coverage.

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

• Start with simple checks: ensure the fuel cap is tight and the vehicle has sufficient, quality fuel.
• Look for obvious issues—smoke, loss of power or odd noises—and avoid driving if symptoms are severe.
• Use an OBD-II scan tool to read codes; our technicians perform a complete scan and interpret stored and pending codes accurately.
• For warranty protection and accurate repair, scheduled diagnostics and repairs should be handled by a certified dealership like Nalley Lexus Roswell.
• If the light is flashing, stop driving and have the vehicle inspected immediately to prevent damage.

What does it mean when the check engine light comes on in a 2015 Lexus IS 350 C?

• The light signals a fault detected by the engine control module—ranging from a loose fuel cap to sensor failures or misfires.
• Common causes include oxygen sensor faults, catalytic converter issues, EVAP leaks and ignition misfires.
• Some issues are benign, others can damage components or reduce fuel economy; timely dealer diagnosis prevents escalation.
• Nalley Lexus Roswell uses factory-level diagnostics to identify root causes, preserving performance and resale value.
• Warranty-covered repairs must be completed at a certified dealership to maintain coverage and ensure proper parts and labor.

How long does a check engine light service take?

• Basic code read and inspection: typically 30–60 minutes; full diagnostics and road testing: 1–4 hours depending on complexity.
• Intermittent faults or systems that require component testing may take longer; we provide time estimates before work begins.
• Minor repairs can often be completed the same day; major repairs or parts orders extend turnaround time.
• Choosing Nalley Lexus Roswell speeds correct repair the first time—saving you time and long-term expense compared with repeat attempts elsewhere.
• Warranty repairs performed at our certified facility ensure proper documentation and coverage compliance.