Frequently Asked Questions

How much does a check engine light diagnostic cost for a 2023 Lexus NX 350?

• Diagnostic fees typically range from a modest flat rate to a few hundred dollars depending on the depth of testing and whether road testing is required.
• At Nalley Lexus Smyrna our diagnostics often cost less than independent shops because we use factory procedures and efficient tools that reduce labor time and repeat visits.
• Diagnostics include code reading, live-data inspection, and a clear repair estimate—helping you avoid expensive, unnecessary repairs.
• Any repairs covered under warranty must be performed at a certified dealership to preserve coverage and ensure OEM parts and factory-trained technicians handle the work.

What does it mean when the check engine light comes on in a 2023 Lexus NX 350?

• The light can indicate anything from a minor issue—like a loose gas cap—to more serious items such as misfires, oxygen sensor failures, or catalytic converter problems.
• Modern vehicles monitor emissions, engine performance, and fuel systems; a stored code pinpoints the monitored system and helps technicians diagnose the root cause.
• Ignoring the light can lead to reduced fuel economy, increased emissions, or worsening mechanical damage that raises repair costs.
• Bring your vehicle to a certified dealership for a full scan and accurate diagnosis to protect long-term value and warranty coverage.

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

• Start with simple checks: ensure the gas cap is tightened and inspect for obvious signs like unusual noises, smoke, or severe drivability issues.
• If the vehicle shows reduced power, stalling, or a flashing light, avoid extended driving and have the vehicle inspected immediately to prevent further damage.
• Using an OBD-II scanner can reveal active codes, but clearing codes without making repairs can mask problems and risk long-term harm.
• For reliable results and warranty protection, have our factory-trained technicians at Nalley Lexus Smyrna perform the diagnosis and required repairs.

How long does a check engine light service take?

• Basic diagnostics typically take between 30 and 90 minutes; more involved troubleshooting or road testing can extend that time.
• Simple repairs—like replacing a gas cap or oxygen sensor—may be completed the same day, while complex issues such as catalytic converter replacement require additional time and parts.
• Nalley Lexus Smyrna streamlines service with factory tools and trained technicians, which often reduces labor hours and overall cost compared with repeat visits to independent shops.
• Remember that warranty-covered repairs must be performed at a certified dealership to maintain coverage and ensure correct procedures and parts are used.

What is the most common reason for check engine light on a 2023 Lexus NX 350?

• The most frequent causes are a loose or faulty gas cap, oxygen sensor failures, or minor misfires that trigger emissions-related codes.
• While some causes are inexpensive to fix, leaving issues unaddressed can escalate into costly repairs such as catalytic converter replacement or engine damage.
• Our dealership can often address common problems faster and for less overall cost than independent shops by using OEM parts and diagnostic procedures that reduce unnecessary parts replacement.
• Any repair covered under warranty must be completed at a certified dealership to protect coverage and vehicle value—trust Nalley Lexus Smyrna for accurate service and long-term savings.