Frequently Asked Questions

What does it mean when the check engine light comes on in a 2018 Ford Fiesta?

• It signals that the vehicle’s onboard diagnostics detected an engine, emissions, or sensor issue. Common causes range from a loose gas cap to a failing oxygen sensor or catalytic converter.
• We inspect the battery, charging system, and engine sensors to rule out electrical causes—battery or alternator problems can trigger the light and affect starting and charging behavior.
• Choosing Larry H. Miller Ford Mesa in Mesa, AZ means certified Ford technicians use OEM parts for accurate diagnosis and lasting repairs. Our approach often costs less than independent shops when you factor in immediate fixes, fewer return visits, and long-term reliability.
• All warranty-covered repairs must be performed at a certified dealership to preserve coverage. We also offer service financing so you can get necessary work done now and pay later.
• Ready to act? You can schedule service online or check current service specials before you come in.

How long does a check engine light service take?

• Diagnostic time typically ranges from 30 minutes to 2 hours depending on the complexity. Simple codes (like a loose gas cap or battery issue) are resolved quickly; complex repairs that require parts can take longer.
• At Larry H. Miller Ford Mesa, our technicians prioritize quick turnarounds using factory tools and diagnostic software to reduce downtime and avoid repeat visits.
• We emphasize immediate and long-term savings: faster accurate repairs reduce follow-up costs and protect vehicle value, which independent shops sometimes miss.
• We offer transparent estimates, OEM parts, and warranty-backed repairs—warranty work must be done at a certified dealership to remain valid. Service financing is available to help spread payments.
• To get started, schedule appointment online and browse our current service specials.

How much does a check engine light diagnostic cost for a 2018 Ford Fiesta?

• Diagnostic fees vary, but our pricing is competitive and often less than independent shops when you consider the complete service package and warranty protection.
• A diagnostic includes computerized code reading, live data review, battery and charging checks, and a clear repair plan. Immediate fixes may be completed the same day to save you time and money.
• We emphasize long-term savings: accurate diagnosis and OEM parts reduce repeat visits and preserve vehicle health. Any warranty-related repairs must be performed by a certified dealership to remain covered.
• Ask about financing options to get your vehicle serviced now and pay over time. Check our service specials for discounts before you arrive.

What is the most common reason for check engine light on a 2018 Ford Fiesta?

• Common issues include faulty oxygen sensors, loose or damaged gas caps, evaporative emissions (EVAP) leaks, failing catalytic converters, and battery/charging problems.
• Battery and charging faults can present as intermittent lights, poor starts, or electrical anomalies. Our certified technicians perform thorough battery and alternator tests as part of diagnostics.
• At Larry H. Miller Ford Mesa, we focus on accurate pinpoint diagnosis and OEM replacements to prevent future faults—this reduces total ownership costs versus repeated repairs.
• Warranty-covered repairs must be done at a certified dealership. We also provide service financing and transparent estimates so you can decide with confidence.
• To confirm the cause, schedule service today and view current service specials.

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

• Start with basic checks: ensure the gas cap is tightened, inspect for obvious battery or terminal corrosion, and note any changes in performance or noise.
• Battery health is critical—weak batteries or poor charging can trigger sensors and lights. Our technicians test batteries and charging systems as a priority during diagnostics.
• Choosing Larry H. Miller Ford Mesa delivers immediate and long-term savings through proper diagnosis, OEM parts, and warranty protection. Repairs covered under warranty must be completed at a certified dealership to maintain coverage.
• We offer service financing, clear pricing, and same-day options when possible. Book now to get an expert inspection: schedule appointment and review our service specials.