Frequently Asked Questions

What does it mean when the check engine light comes on in a 2026 Mercedes-Benz S-Class?

• It signals the vehicle’s onboard diagnostics have detected an issue—anything from a loose gas cap to emissions or hybrid-system faults. For a 2026 Mercedes-Benz S-Class, that can include engine, turbocharger, fuel delivery, or electrified system alerts tied to the plug-in-hybrid components.
• At Mercedes-Benz of Chesterfield we diagnose the cause quickly with factory-grade tools and certified technicians to protect long-term performance and resale value.
• We often cost less than independent shops when you consider immediate diagnostic accuracy, OEM parts, and long-term savings from avoiding secondary damage. Repairs covered under warranty must be performed at a certified dealership to remain valid.
• We offer service financing so you can get repairs now and pay later. When you’re ready, schedule service online for fast priority handling.

How long does a check engine light service take?

• Diagnostics typically take 30–90 minutes depending on codes and system checks for the 2026 Mercedes-Benz S-Class; follow-up repairs vary by the required work.
• Mercedes-Benz of Chesterfield uses targeted testing to reduce repair time and return you to the road faster with the correct OEM parts and procedures.
• We provide clear, itemized estimates so you see immediate and long-term savings compared with trial-and-error repairs.
• Book a convenient time or schedule appointment and ask about current service specials or service financing options.

How much does a check engine light diagnostic cost for a 2026 Mercedes-Benz S-Class?

• Diagnostic pricing varies with complexity; Mercedes-Benz of Chesterfield provides transparent rates and competitive value, often costing less than independent shops when factoring in accurate diagnosis and OEM repair plans.
• A full dealer diagnostic includes advanced scan tools, live data analysis, and a certified technician’s inspection—this reduces repeat visits and expensive follow-up repairs, delivering long-term savings.
• If repairs are covered under warranty, they must be done at a certified dealership to preserve coverage and ensure OEM parts and procedures are used.
• We offer payment options and service financing so you can address the issue immediately and avoid escalation—click to schedule service or review current service specials.

What is the most common reason for check engine light on a 2026 Mercedes-Benz S-Class?

• Common causes include oxygen sensor or catalytic converter issues, fuel trim faults, ignition/misfire events, and sensor faults related to the turbocharger or hybrid system.
• Left unaddressed, a simple sensor issue can lead to reduced fuel economy, increased emissions, or damage to the catalytic converter—costly to repair later.
• Mercedes-Benz of Chesterfield diagnoses root causes fast to protect vehicle performance and reduce long-term maintenance costs.
• Use our online scheduler to schedule appointment and check available service specials before you arrive.

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

• Start with basic checks like gas cap seating on conventional vehicles, but for a 2026 Mercedes-Benz S-Class you should rely on a certified scan to read stored fault codes rather than guessing.
• Early dealer diagnosis prevents misdiagnosis and protects warranty coverage. Repairs under warranty must be done at a certified dealership to remain valid.
• Our technicians use OEM diagnostic procedures to save you time and money over the long run, and we offer service financing so you can get the work done right away.
• To prioritize your visit, please schedule service online and review our service specials for potential savings.