Frequently Asked Questions

What does it mean when the check engine light comes on in a 2018 BMW 6 Series Gran Coupe?

• It signals the vehicle’s diagnostic system has detected an emissions, fuel, ignition, or sensor issue. At Nalley BMW of Decatur our factory-trained technicians use BMW-approved scanners to read precise fault codes and recommend the right repair.
• We prioritize quick identification and clear estimates so you know immediate needs versus items to monitor — this saves money now and prevents costly future damage.
• Repairs covered under warranty must be performed at a certified dealership to preserve coverage — our team will confirm warranty status and apply OEM parts when required.
• To get expert diagnostics, you can schedule service online or check current offers on our service specials.

How long does a check engine light service take?

• Most diagnostics are completed the same day; simple code reads and minor repairs can be under an hour, while complex repairs may require parts ordering and longer shop time.
• Nalley BMW of Decatur offers efficient processes, express lanes, and dealer-only tools to speed accurate repairs without cutting corners.
• We also offer service financing so you can get necessary work done now and pay later, minimizing downtime and protecting vehicle longevity.
• To plan your visit, schedule appointment online and view our current service specials for savings.

How much does a check engine light diagnostic cost for a 2018 BMW 6 Series Gran Coupe?

• Diagnostic pricing can vary by issue, but many scans begin around $89. At Nalley BMW of Decatur our pricing is competitive — often costing less than independent shops while delivering factory-trained expertise and OEM parts.
• Choosing the dealership can yield immediate and long-term savings through accurate repairs, warranty protection, and reduced repeat visits.
• We’ll provide a clear estimate before work begins and highlight warranty or loyalty discounts when applicable.
• Check our service specials or schedule service to get started.

What is the most common reason for check engine light on a 2018 BMW 6 Series Gran Coupe?

• Common causes include failing oxygen sensors, loose or damaged gas caps, ignition misfires, or turbo/sensor faults — any of which can affect performance and fuel economy.
• Nalley BMW of Decatur’s diagnostic approach identifies root causes quickly so you avoid compounding damage that increases repair costs.
• We recommend dealership service to maintain warranty and ensure OEM parts are used for durability and proper fit.
• Use our schedule service link to reserve diagnostic time and review available service specials.

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

• Begin with simple checks: ensure the gas cap is tight, check fluids visually, and note any performance changes or warning messages.
• If the light persists or flashes, bring the vehicle to Nalley BMW of Decatur — flashing lights can indicate immediate engine damage risk and require prompt dealer-level diagnostics.
• We’ll provide transparent estimates, explain warranty implications (repairs under warranty must be done at a certified dealership), and outline long-term benefits of dealer-performed repairs.
• To book, schedule service today or review our service specials for savings.