Frequently Asked Questions

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

• Common causes include misfires (ignition coils or spark plugs), oxygen sensor failure, catalytic converter efficiency loss (P0420), and evap system leaks (P0455).
• Ignoring the light can reduce fuel economy, increase emissions, and cause more expensive downstream repairs such as catalytic converter replacement.
• At Nalley Lexus Smyrna our diagnostics isolate the root cause quickly; repairs under warranty must be performed at a certified dealership to preserve coverage.
• We often cost less than independent shops while delivering factory-trained technicians and long-term savings through correct repairs and genuine parts.

How long does a check engine light service take?

• Typical diagnostic appointments at our dealership take 30–90 minutes depending on symptoms and whether a road test is needed.
• Simple fixes (sensor replacement, loose gas cap) can often be completed the same day; complex repairs may require additional parts or scheduled work.
• Because warranty-covered repairs must be completed at a certified dealership, choosing Nalley Lexus Smyrna ensures proper repairs and documentation without delaying your coverage.
• Our factory-trained technicians and OEM parts reduce repeat visits and deliver immediate and long-term savings compared with repeated independent attempts.

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

• The light signals the vehicle’s onboard diagnostics detected a fault in emissions, fuel, ignition or engine management systems.
• It can indicate anything from a loose gas cap to serious misfires that can damage the catalytic converter if left unaddressed.
• Diagnostic scanning at Nalley Lexus Smyrna pinpoints stored codes and live data so we can recommend the correct repair and preserve warranty coverage by performing service here.
• Using our dealership often provides lower total ownership cost: accurate repairs, genuine parts, factory-trained techs, and documented service history.

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

• Diagnostic pricing varies; our dealership provides transparent rates and often runs service specials to reduce upfront diagnostic expense—check our Service Specials.
• Because repairs covered under warranty must be performed at a certified dealer, having the diagnostic done here avoids denied claims and long-term expense.
• Many customers find immediate and long-term savings at Nalley Lexus Smyrna compared with repeated independent fixes: accurate diagnosis, genuine parts, and warranty protection lower total cost of ownership.
• We can provide an estimate after the scan, showing repair options, parts, labor, and any warranty coverage that applies.

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

• Start with basic checks: ensure the gas cap is tight and inspect for obvious fluid leaks or wiring damage under the hood.
• If the light persists, have the vehicle scanned for codes; Nalley Lexus Smyrna uses OEM-level tools to read codes and live sensor data.
• For flashing or severe symptoms, stop driving and bring the vehicle to our dealership immediately to prevent further damage and protect warranty coverage.
• Prompt, professional diagnostics at our dealership often mean lower repair costs over time thanks to correct repairs and factory-trained technicians.