Frequently Asked Questions

What is the first thing to check when the check engine light comes on in a 2021 Lexus RC 300?

• Check the gas cap: a loose or damaged cap is a common, quick fix that can trigger the light.
• Look for obvious issues: low fuel, visible leaks, or unusual smells before driving further.
• Note symptoms: rough idle, loss of power, or unusual noises—these help our technicians diagnose faster.
• Bring the vehicle to Nalley Lexus Smyrna promptly; warranty-covered repairs must be performed at a certified dealership.
• Using our service saves you immediate and long-term costs by avoiding misdiagnosis and protecting factory warranties.

How much does a check engine light diagnostic cost for a 2021 Lexus RC 300?

• Diagnostics at our dealership typically fall into a transparent, competitive range and are often comparable or less than independent shops.
• Many diagnostics are $75–$150 and may be waived if you proceed with recommended repairs at Nalley Lexus Smyrna.
• We use factory-grade scanners and factory-trained technicians to pinpoint problems quickly, reducing unnecessary parts and labor.
• Having service done here can lower long-term ownership costs by preserving warranty coverage and preventing secondary damage.

What does it mean when the check engine light comes on in a 2021 Lexus RC 300?

• It indicates the vehicle’s on-board diagnostics detected an emissions, engine, or transmission fault—ranging from minor to serious.
• Common triggers include EVAP leaks, oxygen sensor failure, ignition misfires, or catalytic converter issues.
• Prompt diagnosis at our dealership identifies whether it’s a simple fix or a repair that could cause further damage if ignored.
• Certified repairs here protect your warranty and often cost less over time by preventing escalation of the problem.

How long does a check engine light service take?

• Initial diagnostic scans usually take 30–60 minutes; more complex issues may require additional time for road testing and inspections.
• Simple repairs like replacing a gas cap or clearing a code can be completed the same day; component repairs vary by part availability.
• We prioritize efficient service with factory-trained technicians, minimizing your downtime and long-term costs.
• If a repair is covered under warranty, it must be completed at a certified dealership to maintain coverage and ensure proper parts and labor.

What is the most common reason for check engine light on a 2021 Lexus RC 300?

• Loose or faulty gas cap and EVAP system leaks are frequent, inexpensive to fix, and often the first things our team checks.
• Oxygen sensor failure and ignition misfires are also common and can lead to reduced fuel economy and emissions problems.
• Addressing these quickly at Nalley Lexus Smyrna reduces the risk of more costly repairs like catalytic converter replacement.
• Our certified technicians diagnose accurately to avoid unnecessary parts replacement and to protect long-term vehicle value.