Frequently Asked Questions

How much does a check engine light diagnostic cost for a 2018 Mercedes-Benz GLS-Class?

• Typical diagnostics at our dealership start in a modest range (many common scans fall between $80–$200), depending on the depth of testing and any road tests required.
• If repairs are needed, our dealership often costs less than independent shops when you factor immediate fixes, genuine parts, and long-term reliability from factory-trained technicians.
• Many warranty-covered repairs must be performed at a certified dealership to remain valid — we’ll verify warranty status before work begins and document coverage.
• Ask about current service offers and diagnostic specials before your visit; our Service Specials and easy online Scheduler can lower your out-of-pocket expense.

What does it mean when the check engine light comes on in a 2018 Mercedes-Benz GLS-Class?

• The light indicates the vehicle’s onboard diagnostics have detected a deviation — causes range from a loose fuel cap to sensor faults, ignition misfires, or emissions-control issues.
• Common triggers include O2 sensor faults, catalytic converter efficiency alerts, evaporative system leaks, and engine misfires; each has different urgency and repair cost implications.
• Ignoring the light can lead to higher repair bills and possible damage; our dealership emphasizes immediate diagnostics to minimize long-term expenses.
• We use OEM tools and factory-trained technicians to diagnose accurately and protect warranty eligibility — any covered repairs must be done at a certified dealership.

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

• Start with a simple visual check: ensure the gas cap is tightly closed and the dashboard has no additional critical warnings.
• If the vehicle runs normally, avoid heavy loads or long trips and schedule a prompt diagnostic appointment to prevent escalation.
• If the light is flashing or the vehicle runs rough, stop driving and contact our service center — continued operation can cause engine or catalytic converter damage.
• Scheduling service at Park Place Motorcars Fort Worth ensures accurate diagnostics, factory parts, and maintenance history continuity for warranty protection.

How long does a check engine light service take?

• Basic code read and inspection can often be completed within one hour; full diagnostic visits typically take one to three hours depending on complexity.
• Simple repairs (tightening a gas cap, replacing a sensor) are often same-day; complex issues like misfire diagnosis or catalytic replacement can require additional parts and time.
• Our dealership uses efficient scheduling, OEM tools, and factory-trained technicians to reduce turnaround time and lower long-term ownership costs compared to repeated visits elsewhere.
• Use our online Service Scheduler or view Service Specials to book an appointment that fits your timeline and budget while protecting warranty coverage.