Frequently Asked Questions

What does it mean when the check engine light comes on in a 2014 Mercedes-Benz GL-Class?

• It signals that the vehicle’s onboard diagnostics have detected an issue—anything from a loose gas cap to an emissions sensor failure or turbocharger-related fault on your 2014 Mercedes-Benz GL-Class.
• Our Mercedes-Benz of Lynnfield technicians run a full OEM-grade scan to identify the specific code and explain the problem, recommended repair, and expected costs so you can make an informed decision.
• Choosing our dealership often costs less than independent shops because we combine factory diagnostic tools, OEM parts, and efficient repairs that avoid repeated visits—giving immediate savings and better long-term value.
• Repairs covered under warranty must be performed at a certified dealership to preserve coverage; we’ll confirm any applicable warranty benefits before work begins.
• We offer service financing so you can get the necessary repairs now and pay over time; to book, please schedule service online.

How long does a check engine light service take?

• Typical diagnostic scans for a 2014 Mercedes-Benz GL-Class take about 30–60 minutes; follow-up repairs vary by severity and parts availability.
• Minor fixes like sensor replacements or a gas cap check can often be completed the same day; more complex issues that require parts or in-depth troubleshooting may take longer.
• At Mercedes-Benz of Lynnfield we prioritize transparent timelines, and our service advisors will provide an ETA before work begins so you can plan accordingly.
• We recommend checking our current offers and discounts on service specials to reduce out-of-pocket cost and enjoy added value.
• To guarantee fast lamp-to-clear service, please schedule appointment so we have the right tools and parts ready when you arrive.

How much does a check engine light diagnostic cost for a 2014 Mercedes-Benz GL-Class?

• Diagnostic fees vary by issue and region, but Mercedes-Benz of Lynnfield provides competitive pricing and clear estimates after the scan is complete.
• Our approach reduces long-term expense—accurate diagnostics prevent unnecessary part replacement and repeat labor, delivering immediate and ongoing savings.
• Any warranty-covered diagnostics or repairs must be performed at a certified dealership to maintain coverage; we’ll verify your warranty before starting work.
• We also provide service financing to help with unexpected repairs—ask our service team about payment options when you schedule service.

What is the most common reason for check engine light on a 2014 Mercedes-Benz GL-Class?

• Common causes include faulty oxygen sensors, catalytic converter issues, loose or faulty gas caps, and turbocharger sensor faults—on a vehicle with a twin-turbo 4.7L V8, boost-related sensors and wiring are frequent culprits.
• Left unattended, these issues can reduce fuel economy, accelerate emissions component wear, and lead to more costly repairs—getting a timely diagnosis preserves vehicle life and value.
• Mercedes-Benz of Lynnfield uses OEM parts and factory diagnostic equipment to ensure repairs are precise and durable, often delivering better value than repeated independent fixes.
• Check current offers before you visit by viewing our service specials, and schedule appointment for priority diagnostic time.

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

• Start with simple checks: secure the gas cap and inspect for obvious issues. If the light persists, a professional scan is the next step to read the stored codes on your 2014 Mercedes-Benz GL-Class.
• Do not ignore the light—early diagnosis at Mercedes-Benz of Lynnfield can prevent costly downstream failures and maintain peak performance for your 4.7L twin-turbo V8.
• If the light flashes, treat it as urgent and bring the vehicle in right away; flashing often means a severe misfire that can damage the catalytic converter.
• We make service easy—view our current service specials and schedule service online to get prioritized attention from factory-trained technicians.