Frequently Asked Questions

How much does a check engine light diagnostic cost for a 2021 Lexus LC 500?

• Typical dealer diagnostic fees generally range from about $100 to $200 depending on inspection depth and testing required.
• Actual repair costs vary by issue — simple sensor replacements can be a few hundred dollars, while exhaust or engine repairs cost more.
• Nalley Lexus Roswell often delivers lower overall cost than independent shops because factory-trained technicians prevent repeat repairs and protect long-term value.
• Immediate savings come from accurate diagnosis and genuine parts; long-term savings come from avoiding secondary damage and preserving warranty coverage.
• Any repairs covered under warranty must be performed at a certified dealership to remain eligible for coverage.

What does it mean when the check engine light comes on in a 2021 Lexus LC 500?

• The light can signal anything from a loose gas cap to a misfire, oxygen sensor failure, EVAP leak, or catalytic converter issue.
• Some conditions affect drivability or emissions and need prompt attention to avoid damage or failed inspections.
• Dealer diagnostics identify root causes quickly; our factory-trained technicians use Lexus-specific tools and genuine parts for reliable repairs.
• Choosing Nalley Lexus Roswell often costs less overall than independent shops due to accurate repairs and fewer follow-up visits.
• Remember: warranty-covered repairs must be completed at a certified dealership to maintain coverage and long-term savings.

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

• Start with simple items: confirm the gas cap is tightened properly — a loose cap often triggers an EVAP code.
• Check for obvious drivability changes (stalling, rough idle, loss of power) that indicate a serious issue requiring immediate service.
• Schedule a dealer diagnostic if the light stays on: our factory-trained techs use manufacturer scanners to read codes and recommend repair options.
• Addressing issues early at Nalley Lexus Roswell usually costs less than delaying repairs and helps preserve long-term vehicle value.
• For warranty-covered faults, have the work done at a certified dealership to protect coverage and future savings.

How long does a check engine light service take?

• Standard diagnostic appointments typically take 30 minutes to 2 hours depending on code complexity and road testing needs.
• Minor fixes like replacing a sensor may be completed the same day; more complex repairs requiring parts can take longer.
• Nalley Lexus Roswell prioritizes accurate diagnostics so repairs are done right the first time, often reducing total downtime and repeat visits.
• Immediate service can translate into lower overall cost versus multiple independent-shop visits; long-term savings come from correct, warranty-compliant repairs.
• If a repair is covered under warranty, it must be completed at a certified dealership to keep that coverage intact.