Frequently Asked Questions

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

• Check the fuel cap: a loose or damaged cap is a common trigger and an easy first step.
• Confirm you filled with premium unleaded fuel, as required for the NAG engine, and note any recent fueling mistakes.
• Look for obvious issues: low oil level, severe fluid leaks, or overheating signs under the hood.
• Record symptoms (stuttering, loss of power, unusual noises) to share with our technicians for faster diagnosis.
• If covered under warranty, remember repairs must be performed at a certified dealership to preserve coverage.

How long does a check engine light service take for a 2025 Mercedes-Benz GLC-Class?

• Basic diagnostic scans typically take 30–60 minutes using Mercedes-Benz factory tools to read codes and live data.
• If additional testing or road checks are needed, expect 1–3 hours depending on complexity.
• Simple fixes (loose cap, sensor swap) can often be completed the same day; more complex repairs require scheduling.
• We provide realistic timelines and loaner or shuttle options; certified repairs often save time and money long term.
• Warranty-covered repairs must be completed at our dealership to ensure benefits and proper documentation.

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

• The light indicates the engine management system has detected a fault — anything from emissions to ignition or fuel delivery issues.
• Common triggers include O2 sensor faults, misfires, evap leaks, or catalytic converter inefficiency for the NAG engine.
• Severity varies: some faults are minor, others can affect drivability or damage components if ignored.
• Prompt diagnosis at our dealership reduces immediate costs and prevents expensive long-term repairs; we often cost less than independents when factoring accuracy, OEM parts, and warranty protection.
• Any warranty-covered repair must be performed at a certified dealership to preserve coverage and ensure OEM standards.

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

• Diagnostics at our dealership commonly range from a modest service fee for scanning and initial testing; rates vary by work required.
• Some repairs may be covered under warranty or manufacturer campaigns—if so, diagnostics or repairs may be free or reduced when performed here.
• Although independents may advertise lower upfront fees, our dealership frequently costs less overall because we identify root causes correctly the first time and use OEM parts.
• Choosing Mercedes-Benz of Lynnfield delivers immediate savings on accurate diagnostics and long-term savings by preventing repeat repairs.
• Remember: warranty-covered repairs must be completed at a certified dealership to maintain protection.

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

• Loose or faulty gas cap and evap system leaks are frequent, simple causes and the first things to rule out.
• Oxygen sensor faults and catalytic converter concerns are common for modern vehicles and can trigger codes.
• Ignition misfires from spark plugs or coils, and fuel system issues, also regularly activate the light.
• Our diagnostic approach identifies the exact cause; using a certified dealer minimizes repeat visits and long-term expense.
• Warranty repairs must be done at a certified dealership to ensure coverage and correct OEM procedures.