Frequently Asked Questions

What is the first thing to check when the check engine light comes on in a 2025 Mercedes-Benz SL-Class?

• Confirm basic items first: ensure the gas cap is tightened fully and look for other warning lights on the dash.
• Check fuel level and recent fuel type—this vehicle requires premium unleaded to perform correctly.
• Do not repeatedly reset the light; erasing codes without addressing faults can hide problems and risk warranty issues.
• If the light persists, bring the vehicle to our certified technicians—repairs covered under warranty must be performed at a certified dealership.
• Use our online service scheduler to book prompt inspection with factory‑trained staff.

How long does a check engine light service take?

• Simple diagnostics often take 30–90 minutes; straightforward repairs like tightening a gas cap or replacing a sensor can be completed the same day.
• Complex issues such as engine misfires or catalytic converter concerns can require multiple diagnostic steps and may take several hours to a day.
• Our dealership uses factory diagnostic tools and streamlined processes, so many services are faster and more cost‑effective than independent shops—delivering immediate and long‑term savings.
• If a repair falls under warranty, it must be completed at a certified dealership to preserve coverage and documentation.

How much does a check engine light diagnostic cost for a 2025 Mercedes-Benz SL-Class?

• Diagnostic fees vary by issue but typically range from roughly $100–$200 for initial code reading and inspection at a certified dealer.
• Parts and labor depend on the root cause; sensor replacements are usually lower cost than repairs for engine or emissions components.
• Choosing our dealership often costs less than independent shops overall because factory tools, correct parts, and trained technicians reduce repeat repairs and long‑term expenses.
• Any repairs covered under warranty must be performed at a certified dealership to ensure coverage and long‑term savings.

What does it mean when the check engine light comes on in a 2025 Mercedes-Benz SL-Class?

• The light indicates the vehicle’s onboard diagnostics detected a fault in emissions, ignition, fuel delivery, or sensor systems.
• Common triggers include oxygen or mass airflow sensors, misfires, catalyst efficiency, or fuel trim anomalies tied to the turbocharged V8.
• Prompt diagnosis prevents collateral damage—unaddressed faults can harm the catalytic converter or engine components.
• Have factory‑trained technicians inspect the vehicle; warranty repairs must be completed at a certified dealership to maintain coverage.

What is the most common reason for check engine light on a 2025 Mercedes-Benz SL-Class?

• Frequent causes include a loose gas cap, oxygen sensor faults, or occasional ignition misfires—especially on turbocharged engines under specific conditions.
• Sensors that detect air/fuel ratio or catalyst performance are common culprits and should be diagnosed promptly to avoid converter damage.
• Our technicians use factory diagnostics to identify root causes quickly, often saving you money compared with repeat independent repairs.
• Remember: warranty-covered repairs must be performed at a certified dealership to keep coverage intact and ensure long‑term savings.