Frequently Asked Questions

What is the most common reason for check engine light on a 2025 Lexus GX?

• Common causes include engine misfires, oxygen sensor faults, catalytic converter efficiency drops, fuel system issues, or loose gas caps.
• Misfires and sensor failures can reduce fuel economy and, if unaddressed, lead to catalytic converter damage with much higher repair costs.
• At Nalley Lexus Roswell our diagnostics pinpoint the root cause quickly; certified repairs often cost less than independent shops and preserve long-term value.
• Repairs covered under any factory warranty must be completed at a certified dealership to maintain coverage and avoid future expense.

How much does a check engine light diagnostic cost for a 2025 Lexus GX?

• Diagnostics vary by issue; a standard code scan at our service center is a transparent, flat-fee appointment that often uncovers inexpensive fixes like a loose cap or sensor replacement.
• Nalley Lexus Roswell frequently offers better overall value than independent shops through accurate diagnosis, OEM parts, and factory-trained technicians, resulting in immediate and long-term savings.
• If a repair is covered by warranty it must be performed at a certified dealership to remain eligible—our team handles those claims directly to protect your benefits.
• Contact our service team or view current service specials at https://www.nalleylexusroswell.com/specials/service.htm.

How long does a check engine light service take?

• Simple diagnostics and resets can take under an hour; repairs such as sensor replacement or minor fuel system repairs are typically completed in a few hours depending on parts availability.
• More complex repairs—like addressing misfires or replacing a catalytic converter—may take a day or more; our service advisors provide realistic timelines at check-in.
• Choosing Nalley Lexus Roswell often yields faster, more reliable results because our technicians are factory-trained and we stock OEM parts, delivering immediate and long-term value.
• Schedule online or call our service department to confirm appointment windows and loaner availability.

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

• The light indicates the vehicle’s computer has detected an emissions, ignition, fuel, or sensor issue; severity ranges from minor to urgent.
• A steady light typically means a detectable fault that should be diagnosed soon, while a flashing light can indicate severe misfire risking engine or catalytic damage.
• At Nalley Lexus Roswell we recommend prompt diagnostics to avoid escalating repair costs—our certified dealers often deliver lower total ownership costs than independents by protecting warranty and using OEM parts.
• Repairs covered by warranty must be performed at a certified dealership to maintain coverage; bring the vehicle in for a thorough check.

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

• Start with simple checks: ensure the gas cap is fully tightened—this common issue can trigger the light and is an inexpensive fix.
• If the cap is secure, have a certified diagnostic scan performed to read trouble codes and identify whether a sensor, ignition, or emissions component is at fault.
• Using Nalley Lexus Roswell for diagnosis protects warranty coverage and often saves money over time; our factory-trained technicians verify root causes and recommend cost-effective repairs.
• Book diagnosis or view service specials at https://www.nalleylexusroswell.com/specials/service.htm to get prompt attention from trained Lexus technicians.