Frequently Asked Questions

How long does a check engine light service take?

• Initial diagnostic typically takes 30–90 minutes depending on code complexity and test drive requirements.
• Minor fixes (sensor replacement, tighten gas cap) can often be completed the same day.
• Complex repairs requiring parts or deeper inspection may take 1–2 days; we provide accurate estimates up front.
• Choosing Mercedes‑Benz of Sudbury saves time long term: factory-trained technicians diagnose faster and avoid repeat visits common with inexperienced shops.

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

• Check the fuel cap—an improperly sealed cap is a frequent, simple cause and may clear the light after driving.
• Look for obvious signs: loose wires, disconnected vacuum hoses or visible leaks under the vehicle.
• For the 2025 Mercedes‑Benz GLA‑Class, sophisticated systems often require a dealer scan to read manufacturer codes accurately.
• If repairs are covered by warranty, certified dealership service is required to preserve coverage and ensure proper parts and documentation.

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

• Common causes include oxygen sensor faults, evaporative emissions leaks (loose gas cap or small leak), and occasional misfires.
• Modern engines and on‑board diagnostics flag issues early to protect emissions systems and performance.
• Addressing codes promptly prevents catalytic converter damage and higher repair costs later.
• Our dealership often costs less than independent shops over time by preventing repeat work and using correct Mercedes parts and procedures.

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

• Diagnostic fees commonly range from $100–$200 depending on testing required; we provide transparent pricing before work begins.
• Because our technicians are factory-trained, diagnostics are more precise—saving you money by avoiding trial-and-error repairs.
• Immediate savings include accurate repair plans; long-term savings come from correct repairs that prevent further damage.
• Remember: warranty-covered repairs must be done at a certified dealership to maintain coverage and use genuine parts.

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

• The light indicates the vehicle’s onboard diagnostics detected a system operating outside expected parameters—anything from emissions to engine performance.
• It can signal minor issues (sensor or gas cap) or more serious problems (misfire, catalytic converter efficiency loss).
• Prompt dealer diagnosis protects warranty benefits and reduces the chance of costly downstream damage.
• Schedule service with Mercedes‑Benz of Sudbury for certified diagnostics, genuine parts, and factory-level repair standards.