Frequently Asked Questions

What does it mean when the check engine light comes on in a 2021 BMW M5?

• It signals that the vehicle’s onboard diagnostics detected an issue with emissions, fuel, ignition, or other engine systems.
• At Nalley BMW of Decatur our factory-trained technicians use OEM-level tools to read codes, diagnose root causes, and recommend repairs that preserve performance and resale value.
• Choosing the dealership often costs less than independent shops over time because we prevent cascading repairs, use warranty-backed OEM parts, and protect long-term vehicle health.
• We offer service financing so you can get repairs now and pay later, and any warranty-covered work must be performed at a certified dealership to keep coverage valid.
• To get started, schedule service and take advantage of current service specials.

How long does a check engine light service take?

• Diagnostics typically take 30–90 minutes depending on the complexity of codes and any road-testing required.
• If additional repairs are needed, we provide clear estimates and timelines so you can decide while minimizing downtime.
• Nalley BMW of Decatur prioritizes efficiency — same-day or next-day appointments are common thanks to our parts availability and certified technicians.
• We emphasize immediate and long-term savings by identifying underlying issues early to avoid costly follow-up repairs.
• Ready to book? Schedule service online or review our ongoing service specials.

How much does a check engine light diagnostic cost for a 2021 BMW M5?

• Our diagnostics start from $99.75 for the initial scan and inspection, with any additional repair estimates provided up front.
• Nalley BMW of Decatur often costs less than independent shops because our technicians identify and fix root causes quickly, reducing repeated labor and parts expenses.
• Choosing certified service delivers immediate savings through precision diagnostics and long-term savings by protecting components and warranty coverage.
• We offer service financing so you can get the work done now and pay over time; warranty repairs must be completed at a certified dealership to remain valid.
• Check current offers when you schedule appointment or review our service specials for bundled savings.

What is the most common reason for check engine light on a 2021 BMW M5?

• Common causes include faulty oxygen sensors, misfires, catalytic converter issues, or turbo-related sensor faults — each can affect performance and emissions.
• At Nalley BMW of Decatur we use OEM diagnostic procedures to pinpoint the exact cause and avoid unnecessary part replacement.
• Addressing the problem early at the dealership saves money over time by preventing secondary damage and preserving fuel economy and horsepower.
• Repairs performed with genuine parts and certified technicians help maintain factory warranties and long-term reliability.
• Book a visit to diagnose the issue quickly: schedule service and check our service specials for savings.

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

• Start with a diagnostic scan to read stored trouble codes; that's the fastest way to target the issue accurately.
• Nalley BMW of Decatur’s certified technicians follow OEM troubleshooting steps — this reduces guesswork and unnecessary part costs.
• We provide transparent estimates and explain immediate vs. long-term repair benefits so you can make an informed decision.
• Service financing is available so you don’t delay necessary repairs; remember that warranty-covered fixes must be done at a certified dealership.
• To protect performance and safety, schedule service promptly and see current service specials.