Frequently Asked Questions

What is the most common reason for check engine light on a 2020 Lexus IS 350?

• Common causes include misfires, oxygen sensor wear, catalytic converter issues, evaporative system leaks and fuel trim irregularities.
• Misfires can damage the catalytic converter; untreated issues often become costlier over time.
• Diagnostics at Nalley Lexus Smyrna use OEM tools to pinpoint the fault quickly, reducing unnecessary repairs and overall expense.
• Many repairs performed at our certified dealership qualify for warranty coverage—warranty repairs must be completed at a certified dealer to remain valid.

What does it mean when the check engine light comes on in a 2020 Lexus IS 350?

• It indicates the vehicle’s onboard diagnostics detected an emissions or engine control issue; codes are stored in the computer for precise diagnosis.
• Lights can be steady (needs service) or flashing (urgent); both require timely attention to avoid greater damage.
• Bringing your vehicle to Nalley Lexus Smyrna ensures OEM-level scanning and testing by factory-trained technicians who can protect your long-term ownership costs.
• We often deliver lower total cost than independent shops because accurate diagnostics prevent repeat repairs and preserve warranty coverage.

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

• Confirm whether the light is steady or flashing—flashing signals a potential severe misfire and immediate attention is needed.
• Check simple items first: a loose gas cap or recent fueling events can trigger codes and are quick to resolve.
• For accurate results, have Nalley Lexus Smyrna run an OEM diagnostic scan to read codes and recommend needed repairs—this saves time and money long-term.
• Remember: repairs covered under warranty must be done at a certified dealership to maintain coverage.

How much does a check engine light diagnostic cost for a 2020 Lexus IS 350?

• Diagnostic fees vary by issue complexity; at our dealership diagnostics are competitively priced and often lower overall than independent shops after accurate troubleshooting.
• Typical scan and inspection fees commonly range from a modest flat fee to a higher amount when in-depth testing is required—our service team provides transparent estimates before work begins.
• Choosing Nalley Lexus Smyrna delivers immediate savings via correct diagnosis and long-term savings by preventing unnecessary parts replacement.
• If a warranty covers the repair, work must be completed at a certified dealership to preserve benefits and avoid additional out-of-pocket cost.

How long does a check engine light service take?

• Simple diagnostics and fixes (like a loose gas cap or minor sensor replacement) can take under an hour.
• More complex issues—intermittent misfires, catalytic converter work or extensive testing—may require several hours or a day to ensure a complete, quality repair.
• Nalley Lexus Smyrna prioritizes accurate diagnostics with OEM tools; this can mean slightly longer on-the-spot diagnostics but results in fewer return visits and lower long-term costs.
• If repairs are covered by warranty, they must be performed at a certified dealership to remain valid—our team handles warranty claims and keeps your ownership costs down.