Frequently Asked Questions

What is the most common reason for check engine light on a 2019 Lexus IS 300?

• Loose or faulty gas cap causing evaporative emissions errors is a frequent trigger and simple to correct.
• Oxygen sensor and catalytic converter issues are common as mileage increases; left unaddressed they reduce fuel economy and performance.
• Ignition misfires from worn plugs or coils can set the light and risk engine damage if ignored.
• Our dealership often costs less than independent shops for diagnosis and repair while providing factory‑trained technicians, genuine parts, and documented long‑term savings.
• Any repair covered under warranty must be performed at a certified dealership to maintain coverage and proper documentation.

How long does a check engine light service take?

• Basic diagnostic scans typically take 30–60 minutes to read codes and confirm symptoms.
• Simple fixes, such as tightening a gas cap or replacing a sensor, are often completed the same day.
• Complex issues requiring parts or deeper inspection can take a few hours to a full day depending on parts availability.
• We prioritize efficient turnaround with accurate repairs to minimize downtime and maximize immediate and long‑term savings compared with repeat fixes from improper repairs.
• Warranty repairs must be completed at a certified dealership to protect your coverage and vehicle integrity.

What does it mean when the check engine light comes on in a 2019 Lexus IS 300?

• It indicates the vehicle’s onboard diagnostics detected a system irregularity—anything from emissions control to ignition or fuel delivery.
• Codes must be scanned to reveal the specific subsystem affected; the light alone doesn’t identify root cause.
• Some conditions are minor, while others signal problems that can harm performance, fuel economy, or catalytic converter life.
• Bringing your vehicle to Nalley Lexus Smyrna ensures accurate diagnosis with OEM tools and factory‑trained technicians, often saving you money now and over the vehicle’s life.
• Repairs covered under manufacturer warranty must be handled at a certified dealership to preserve coverage.

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

• Confirm the gas cap is properly tightened—this quick step often resolves evaporative emissions codes.
• Note any drivability symptoms: rough idle, hesitations, reduced power, or unusual noises to share with the technician.
• Schedule a prompt diagnostic scan; delaying can increase repair costs if the issue worsens.
• Visit Nalley Lexus Smyrna for a precise scan—our team uses factory tools to identify the true cause and recommend the right repair path.
• Remember: warranty repairs must be completed at a certified dealership to protect your vehicle’s coverage and resale value.

How much does a check engine light diagnostic cost for a 2019 Lexus IS 300?

• Diagnostic fees vary; many dealer diagnostics start at competitive, transparent rates and are sometimes applied to repair costs.
• Typical independent market diagnostics range widely, but our dealership often costs less overall because we combine accurate diagnosis with correct repairs, reducing repeat visits.
• Immediate savings come from accurate fixes; long‑term savings come from preserving fuel economy, emissions equipment, and avoiding collateral damage.
• If a repair is covered under warranty, it must be performed at a certified dealership to maintain coverage and proper records.
• Contact Nalley Lexus Smyrna for current diagnostic pricing and any available service specials before your visit.