Frequently Asked Questions

What does it mean when the check engine light comes on in a 2017 BMW 4 Series?

• It means the vehicle’s onboard diagnostics (OBD-II) has detected an issue with emissions, engine performance, or a monitored system; codes stored should be read by a trained technician to determine the cause.
• At Nalley BMW of Decatur we use factory-grade tools and certified technicians to read, interpret, and explain codes so you understand repairs, parts, and expected costs.
• Addressing codes early preserves engine life and fuel efficiency, often saving immediate and long-term costs compared with delayed repairs.
• Repairs covered under warranty must be performed at a certified dealership to retain coverage and ensure OEM parts and proper documentation.
• To get a professional diagnosis, schedule service with our shop and ask about current service specials and service financing.

How long does a check engine light service take?

• Typical diagnostics take 30–90 minutes depending on code complexity and road test requirements; many issues are identified the same day at Nalley BMW of Decatur.
• Our certified technicians perform a thorough inspection, live-data capture, and any necessary test drives to ensure a correct diagnosis the first time.
• We prioritize transparency: you get an explained estimate, recommended fixes, and options for OEM parts, warranty coverage, and service financing.
• Our streamlined bay scheduling and factory tooling often mean faster, more accurate service that can cost less than independent shops while delivering superior long-term value.
• When ready, schedule appointment online or ask about available service specials.

How much does a check engine light diagnostic cost for a 2017 BMW 4 Series?

• Diagnostic pricing varies by issue; at Nalley BMW of Decatur our diagnostics are competitively priced and provide a full report with repair recommendations and cost breakdowns.
• Choosing our dealership often results in immediate and long-term savings—accurate diagnosis prevents unnecessary parts replacement and protects resale value.
• We offer transparent estimates, OEM parts, and warranty-backed repairs; remember that warranty-covered work must be completed at a certified dealer to remain valid.
• Service financing is available so you can get necessary repairs now and pay later with manageable terms.
• To get a precise price and appointment, schedule service and review current service specials.

What is the most common reason for check engine light on a 2017 BMW 4 Series?

• Common causes include a faulty oxygen sensor, loose or failing gas cap, catalytic system issues, or ignition/coils—each can impact fuel economy and emissions if left unresolved.
• Nalley BMW of Decatur’s technicians diagnose the root cause using OEM tools to avoid misdiagnosis and unnecessary replacement costs.
• Quick, correct repairs preserve performance and reduce lifetime ownership costs; in many cases our dealership pricing is competitive with independent shops while providing factory-level care.
• If repairs are under warranty, having them completed at a certified dealership protects your coverage and ensures genuine parts.
• Book a check today—schedule service and see available service specials.

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

• First check for obvious issues: a secure gas cap or recent fueling events; then have the codes read by a certified technician to determine severity.
• A dealer diagnostic ensures correct interpretation and protects you from unnecessary parts replacement and long-term costs.
• Nalley BMW of Decatur provides transparent estimates, OEM replacements, warranty guidance, and service financing so you can address problems promptly and affordably.
• To avoid escalation and higher future costs, act quickly and schedule service—check our service specials for current savings.