Frequently Asked Questions

How long does a check engine light service take?

• Initial scan and code read: typically 15–45 minutes using factory-grade diagnostic tools.
• Standard diagnostic and road test: 1–3 hours depending on symptoms and whether intermittent faults appear.
• Minor repairs (sensor, loose cap): can often be completed same day when parts are available.
• Major repairs (turbo, catalytic converter): require additional time for parts and calibration; we provide clear time estimates up front.
• Schedule online at our service scheduler for faster turnaround: /service/schedule-appointment-pmf.htm.

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

• Confirm the gas cap is tightened; a loose cap is a frequent, simple cause and can trigger codes.
• Note any drivability changes — rough idle, loss of power, or unusual noises — and relay them to the technician.
• For the 2015 Mercedes-Benz GL-Class, ensure you use the required premium unleaded fuel to avoid fuel-related errors.
• Don’t reset the light yourself and drive long distances; bring the vehicle to a certified dealer if symptoms persist.
• If the light is flashing, stop driving and have the vehicle inspected immediately to prevent costly damage.

What does it mean when the check engine light comes on in a 2015 Mercedes-Benz GL-Class?

• It signals that an onboard system has detected a fault — anything from a loose gas cap to a misfire or emissions issue.
• Common trigger areas: ignition and fuel systems, oxygen sensors, catalytic converter efficiency, and turbocharger-related sensors.
• Because this is a twin‑turbo V8, early diagnostics prevent turbo or catalytic damage that can be expensive to repair.
• Bring the vehicle to Park Place Motorcars Fort Worth for an OEM-level scan so repairs and warranty needs are handled correctly.
• Repairs covered under warranty must be performed at a certified dealership to preserve coverage and long-term savings.

How much does a check engine light diagnostic cost for a 2015 Mercedes-Benz GL-Class?

• Diagnostic scan fees typically range from about $80–$150; exact pricing is provided at check‑in and may vary by complexity.
• Our dealership frequently costs less than independent shops when you factor in accurate diagnosis, OEM parts and factory-trained technicians.
• Immediate savings come from precise repairs that avoid unnecessary part swaps; long-term savings come from preserving turbo, catalytic, and engine life.
• If a repair is covered under warranty, it must be completed at a certified dealership to ensure full coverage and no out-of-pocket surprises.
• Check current service specials before you visit: /promotions/service/mercedes-benz.htm.

What is the most common reason for check engine light on a 2015 Mercedes-Benz GL-Class?

• Loose or faulty gas cap is a common, easily fixed cause that can trigger emissions-related codes.
• Oxygen sensors and catalytic efficiency problems are frequent on higher-mileage vehicles and affect fuel economy.
• Misfires from ignition coils or fuel trim issues are common on turbocharged engines and should be diagnosed promptly.
• Sensors related to the twin-turbo system or emissions controls can trigger codes that, if ignored, lead to costly turbo or converter failures.
• Our factory-trained technicians identify root causes quickly to minimize repair cost and downtime at Park Place Motorcars Fort Worth.