Frequently Asked Questions

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

• Check for an obvious issue first: ensure the gas cap is tight and the filler is seated correctly — a loose cap is a common cause of an EVAP code.
• If the cap is secure, note any changes in performance (power loss, rough idle, odd noises) and avoid extended driving until checked.
• Bring your 2025 Lexus UX 300h to Nalley Lexus Roswell for a professional scan; dealer diagnostics catch hybrid-specific codes other shops may miss.
• Repairs covered under warranty must be completed at a certified dealership to preserve coverage and deliver the best long-term savings.

What does it mean when the check engine light comes on in a 2025 Lexus UX 300h?

• The light signals the vehicle’s onboard computer has detected an emissions, engine, or hybrid system irregularity — from minor EVAP leaks to more serious hybrid-system or catalytic issues.
• It does not always mean immediate danger, but ignoring it can lead to reduced fuel economy, failed emissions tests, or costly downstream damage.
• Our factory-trained technicians use Lexus-grade diagnostic tools to identify root causes quickly and often deliver lower immediate and long-term costs than independent shops.
• Remember: warranty-covered repairs must be performed at a certified dealership to remain valid and ensure optimized results.

What is the most common reason for check engine light on a 2025 Lexus UX 300h?

• Common causes include EVAP leaks (loose gas cap or hose), oxygen sensor degradation, catalytic efficiency issues, and occasional ignition misfires.
• Hybrid-related codes can also appear; addressing them promptly prevents battery or inverter damage that may become expensive if delayed.
• Nalley Lexus Roswell uses OEM diagnostics to pinpoint hybrid and conventional system faults, helping you avoid unnecessary parts replacement.
• When covered by warranty, repairs must be done at a certified dealership to ensure coverage and achieve the best long-term savings.

How long does a check engine light service take?

• Basic diagnostics typically take 30–60 minutes to scan codes and perform initial inspections; more complex issues can require additional time for troubleshooting.
• If parts or deeper hybrid-system checks are needed, we’ll provide a clear timeline and keep you informed — appointments and express service options are available.
• Choosing Nalley Lexus Roswell often reduces total downtime because factory-trained technicians diagnose correctly the first time, saving time and money versus repeated visits to independent shops.
• Warranty repairs must be completed at a certified dealership to preserve coverage and ensure accurate, efficient completion.

How much does a check engine light diagnostic cost for a 2025 Lexus UX 300h?

• Diagnostics at a certified Lexus dealership typically start in a competitive range and often cost less than independent shops when you factor in accurate diagnosis and repair longevity.
• Many issues are simple and inexpensive (e.g., tightening a gas cap or replacing an O2 sensor), while catalytic or hybrid battery repairs can be costlier if deferred.
• We emphasize immediate and long-term savings: accurate dealer diagnosis prevents repeat work and avoids cascading failures that raise total cost.
• Any repair covered under warranty must be performed at a certified dealership like Nalley Lexus Roswell to maintain coverage and ensure OEM parts and procedures are used.