Frequently Asked Questions

What does it mean when the check engine light comes on in a 2018 BMW 6 Series 650i?

• It signals that the vehicle’s onboard diagnostics detected a system fault — anything from an emissions sensor to ignition or turbocharger issues.
• At Nalley BMW of Decatur we use factory-grade diagnostics to identify the exact code and explain repair options and costs clearly; our approach often costs less than independent shops when you factor immediate fixes, OEM parts, and long-term savings.
• Repairs covered under warranty must be performed at a certified dealership to remain valid; our BMW-certified technicians handle warranty and non-warranty repairs with transparency.
• To address the issue quickly, you can schedule service online or review current service specials.
• We also offer service financing so you can get repairs now and pay later.

How long does a check engine light service take?

• Diagnostic time is normally 30–90 minutes depending on the issue; simple sensor faults are quicker, complex drivability problems require more inspection.
• Nalley BMW of Decatur prioritizes fast turnarounds with OEM tools and parts on site, reducing downtime and improving long-term vehicle reliability.
• We provide a clear timeline and estimate before work begins and highlight savings from using OEM parts and certified labor versus repeated independent repairs.
• To book a convenient slot, schedule appointment now; check our service specials for current offers.
• Service financing is available to spread payments while ensuring prompt, expert care.

How much does a check engine light diagnostic cost for a 2018 BMW 6 Series 650i?

• Diagnostic pricing varies by issue, but at Nalley BMW of Decatur our diagnostics are competitively priced and include a thorough code read and technician review.
• Choosing our dealership often delivers immediate and long-term savings by resolving root causes with OEM parts and trained technicians, reducing repeat visits and unexpected failures.
• If a repair is necessary, we’ll present options and explain warranty coverage — remember warranty repairs must be done at a certified dealership to remain valid.
• Ask about our service specials and service financing to make repairs more affordable.
• To discuss price and timing, schedule service online or call Nalley BMW of Decatur.

What is the most common reason for check engine light on a 2018 BMW 6 Series 650i?

• Common causes include oxygen sensor faults, loose or damaged vacuum lines, ignition coil or spark plug issues, and turbocharger or charge-air control problems.
• Left unfixed, these can reduce fuel economy, increase emissions, and lead to costly repairs — addressing them early saves money and protects performance.
• Our BMW-certified technicians in Decatur diagnose the true cause quickly with OEM tools and recommend cost-effective repairs that preserve vehicle value and efficiency.
• Take advantage of our service specials and ask about service financing to manage costs.
• Book an inspection any time by choosing to schedule appointment.

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

• Start with a diagnostic scan to retrieve fault codes — this identifies the subsystem and narrows down likely causes immediately.
• At Nalley BMW of Decatur our initial scan includes a technician review and clear explanation of findings, recommended repairs, and warranty implications.
• We emphasize transparent pricing, OEM parts, and the long-term cost benefits of dealership service versus repeat fixes from non-certified shops.
• You can schedule service online for a prompt diagnosis and view current offers on our service specials.
• Service financing is available so necessary repairs don’t have to wait.