Frequently Asked Questions

What is the most common reason for the check engine light on a 2026 Lexus IS?

• Common causes include oxygen sensor faults, loose fuel caps, minor vacuum leaks, and ignition misfires — issues typical in compact luxury sedans.
• Small problems left unattended can escalate to catalytic converter damage or driveability failures, increasing repair costs substantially.
• At Nalley Lexus Roswell our factory-trained technicians diagnose quickly and use OEM parts to limit repeat visits and long-term expense.
• Repairs covered under warranty must be completed at a certified dealership to preserve coverage and ensure correct repair records.

How long does a check engine light service take?

• Most diagnostics are completed within 30–90 minutes depending on symptom complexity and road test needs.
• If repairs are required, simple fixes (fuel cap, sensor replacement) may be same-day; more involved repairs may take a day or two.
• Nalley Lexus Roswell prioritizes accuracy over speed: completing diagnosis and repair correctly reduces repeat visits and long-term cost.
• Warranty-covered repairs must be performed at a certified dealership; scheduling through our Service Specials page helps minimize downtime.

What does it mean when the check engine light comes on in a 2026 Lexus IS?

• The light indicates the vehicle’s onboard diagnostics (OBD-II) has detected a fault in emissions, engine, or drivetrain systems.
• Codes may point to immediate issues (misfire, low fuel system pressure) or intermittent faults that need verification by a technician.
• Prompt dealer diagnosis prevents collateral damage; our factory-trained team ensures precise repair and documents warranty eligibility.
• Visit Nalley Lexus Roswell so we can run a complete scan and explain immediate and long-term repair options, often at cost advantages versus independents.

How much does a check engine light diagnostic cost for a 2026 Lexus IS?

• Diagnostic fees vary; many dealerships offer competitive flat-rate scans and often run service promotions — check our Service Specials for current offers.
• While independents may seem cheaper upfront, Nalley Lexus Roswell frequently costs less overall thanks to accurate diagnosis, OEM parts, and fewer repeat repairs.
• Immediate savings come from correct first-time fixes; long-term savings include preserved fuel economy, reduced emissions damage, and warranty protection.
• If a repair is covered under warranty, it must be performed at a certified dealership to maintain coverage and ensure authorized parts and labor.

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

• Start with the basics: check the fuel cap is secure — a loose cap commonly triggers an evaporative emissions code.
• If the light is steady, schedule a diagnostic scan; if it is flashing, limit driving and bring the vehicle to the dealership immediately.
• Our technicians perform a thorough OBD-II read, visual inspection, and road test to identify root causes and prevent unnecessary repairs.
• Using Nalley Lexus Roswell protects warranty rights and ensures work is done by factory-trained technicians with OEM parts for best long-term value.