Frequently Asked Questions

How much does a check engine light diagnostic cost for a 2021 Lexus IS 350?

• Diagnostics at Nalley Lexus Smyrna begin with a full OBD-II scan and visual inspection; we provide a clear estimate before any repair work.
• Our dealership often costs less than independent shops while delivering factory-trained technicians, OEM parts, and precise diagnostics — this delivers immediate savings and reduces long-term repair expenses.
• Some repairs are covered under warranty; any warranty-covered work must be completed at a certified dealership to preserve coverage and maximize savings.
• Typical diagnostic fees vary by condition; a complete dealer diagnosis often uncovers root causes faster, avoiding repeated independent shop visits and higher cumulative cost.

What does it mean when the check engine light comes on in a 2021 Lexus IS 350?

• A check engine light signals the vehicle’s powertrain or emissions system has logged a fault code — causes range from loose gas caps and sensor faults to misfires or catalytic inefficiency.
• Nalley Lexus Smyrna will read diagnostic trouble codes, explain severity, and recommend repairs; early dealer diagnosis protects warranty eligibility and prevents greater expense.
• Addressing issues promptly with factory-trained technicians reduces the risk of progressive damage, lowers fuel costs, and preserves vehicle performance and resale value.
• When repairs are required under warranty, they must be done at a certified dealership to ensure proper parts, procedures, and coverage.

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

• Start with basics: ensure the gas cap is tightened properly — a loose or damaged cap can trigger emissions codes and is a simple DIY check.
• If the light persists, bring your 2021 Lexus IS 350 to Nalley Lexus Smyrna for a rapid scan; our factory-grade tools pinpoint codes accurately so you avoid unnecessary parts replacement.
• We emphasize immediate and long-term savings: a precise dealer diagnosis prevents repeat independent repairs and protects warranty coverage.
• For any repairs covered under warranty, certified-dealership service is required to keep the claim valid and maximize your protection.

How long does a check engine light service take?

• Simple diagnostic scans and minor fixes (like tightening a gas cap or replacing a sensor) can be completed in under an hour in many cases.
• More complex repairs such as ignition misfires, catalytic converter issues, or drivetrain repairs will require additional time; we provide transparent time and cost estimates up front.
• Nalley Lexus Smyrna’s technicians work with OEM parts and factory procedures to reduce repeat visits, delivering both time and cost savings versus multiple independent attempts.
• If the repair is warranty-covered, having the work done at a certified dealership ensures correct procedures and maintains coverage, avoiding costly future denials.

What is the most common reason for check engine light on a 2021 Lexus IS 350?

• Common causes include oxygen sensor failures, catalytic converter efficiency codes, ignition misfires, and EVAP system faults — these are typical culprits for compact luxury performance cars.
• Many of these issues are caught early by diagnostics; correcting them promptly at Nalley Lexus Smyrna reduces fuel consumption, emissions problems, and further component damage.
• Choosing certified-dealership service often costs less over time because factory-trained techs identify root causes and prevent cascading failures that lead to higher bills.
• Remember: warranty-covered repairs must be performed at a certified dealership to preserve coverage and ensure correct OEM repair procedures.