Frequently Asked Questions

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

• It signals that the vehicle’s onboard diagnostics detected an issue — anything from a loose gas cap to an engine misfire. Our certified technicians at Mercedes-Benz of Sudbury in Sudbury, MA, use factory diagnostic tools to identify the exact cause quickly.
• Common findings are emissions faults, sensor failures, and ignition misfires. Addressing the issue promptly prevents more costly repairs and preserves long-term fuel economy and performance.
• We often cost less than independent shops for diagnostics and repairs because our factory processes reduce repeat visits and prolong component life — delivering immediate and long-term savings.
• Repairs covered under warranty must be performed at a certified dealership to maintain coverage. We also offer service financing so you can get service now and pay later.
• To get started, schedule service or check our current service specials.

How long does a check engine light service take?

• Simple diagnostics can take less than an hour; more complex issues may require several hours for testing, road checks, and parts ordering. Our staff provides an accurate time estimate after the initial scan.
• Mercedes-Benz of Sudbury prioritizes transparency: you’ll get a clear repair plan, cost estimate, and timeline. This reduces downtime and avoids unexpected delays.
• We stock many OEM components and use factory tools to speed repairs. Using certified technicians typically shortens total repair time compared to repeated fixes at independent shops.
• We accept service financing for larger repairs and maintain a quick communication loop so you know when your 2025 Mercedes-Benz S-Class is ready.
• To reserve a convenient slot, schedule appointment and review any available service specials.

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

• Diagnostics prices vary by issue, but our pricing is competitive; we often cost less than independent shops while delivering factory-level accuracy and parts. That combination reduces repeat visits and yields long-term savings.
• If further repairs are required, our advisors explain immediate versus preventative repairs and provide transparent estimates before any work begins.
• Remember: warranty-covered repairs must be performed at a certified dealership to remain valid. We use OEM parts and adhere to Mercedes-Benz service standards.
• We offer service financing so you can proceed with necessary repairs now and pay over time.
• Book diagnostics quickly by scheduling service and check current service specials for savings.

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

• Common culprits include oxygen sensor faults, catalytic converter issues, ignition misfires, and EVAP system leaks. Left unaddressed, these can harm fuel economy and damage expensive components.
• Mercedes-Benz of Sudbury uses OEM diagnostics to pinpoint root causes so repairs are done once and done right, which saves money over time.
• Our factory-trained technicians explain cost-effective repair options and warranty coverage; warranty repairs must be completed at certified dealerships to remain valid.
• We provide service financing and transparent estimates to help you manage repair costs with confidence.
• To diagnose the issue before it worsens, schedule service and review our service specials.

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

• Start with a visual check: a loose or missing gas cap can trigger the light. If that’s not the issue, a professional scan is the next step.
• At Mercedes-Benz of Sudbury we perform a full code scan and interpret the results with factory software to avoid misdiagnosis and unnecessary repairs.
• Using OEM procedures and parts reduces the chance of recurring faults — delivering immediate savings and protecting long-term vehicle value.
• Warranty-covered repairs must be performed at certified dealerships; we’ll confirm coverage and offer service financing when needed.
• To have your 2025 Mercedes-Benz S-Class inspected now, schedule service and view available service specials.