Repairing a misfire involves both diagnosis and component replacement, with costs driven by the number of affected cylinders, parts quality, and labor time. The main cost drivers are diagnosis time, ignition components, fuel delivery parts, and any required engine work.
Assumptions: region, engine type, and labor hours vary by vehicle, impacting total price.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| Diagnostic Scan | $50 | $100 | $180 | OBD-II scan + cylinder misfire code interpretation. |
| Ignition Coil | $70 | $140 | $300 | Per coil; most engines require 1–2 coils. |
| Spark Plugs | $8 | $40 | $120 | Includes 4–6 plugs depending on engine. |
| Fuel Injector | $150 | $320 | $600 | Per injector; replacement for a single cylinder if faulty. |
| Labor (hours) | $120 | $280 | $520 | Typical 2–6 hours depending on access and parts. |
| Other Parts & Fluids | $20 | $60 | $180 | Gaskets, seals, oil, and filters as needed. |
| Total Estimated | $430 | $1040 | $1,900 | Assumes 1 misfiring cylinder with common parts. |
Assumptions: region, specs, labor hours.
Overview Of Costs
Costs range from roughly $430 to $1,900 depending on the number of affected cylinders and the parts chosen. A basic misfire on one cylinder with a faulty coil or spark plug typically lands near the lower end, while multiple faulty injectors or a worn engine may push toward the high end.
Typical project ranges are provided with per-unit considerations: diagnostic scan $50–$180, ignition components $70–$300 per item, fuel injectors $150–$600 each, and labor $120–$520 depending on engine layout and accessibility.
Cost Breakdown
Direct costs come from parts and labor, while indirect costs include shop supplies and disposal fees. The table below outlines common cost categories and 4–6 columns for a fuller view of what affects the total.
| Category | Low | Average | High | Notes |
|---|---|---|---|---|
| Materials | $60 | $180 | $620 | Coils, plugs, injectors, seals where needed. |
| Labor | $120 | $280 | $520 | Hourly rates vary by region and shop. |
| Parts & Accessories | $40 | $120 | $360 | Gaskets, oils, air filters, additives. |
| Permits & Fees | $0 | $8 | $40 | Typically minimal for standard repairs. |
| Delivery/Disposal | $0 | $10 | $50 | Oil and part packaging disposal. |
| Warranty | $0 | $25 | $100 | Limited warranty on parts and labor. |
| Taxes | $0 | $40 | $110 | State and local rates apply. |
Factors That Affect Price
Fuel system cleanliness and EFI complexity can shift pricing significantly. Factors such as the engine type, the number of cylinders involved, and whether multiple subsystems are affected drive variability in both parts and labor costs.
For example, offsets include ignition coil quality (OEM vs aftermarket) and whether a cylinder’s injector is single-use or requires replacement with a calibrated set. Labor hours × hourly_rate data-formula=”labor_hours × hourly_rate”> help explain why a similar repair may cost markedly less on one vehicle and more on another.
Where The Money Goes
Most price variance stems from labor intensity and parts choice. Access to the cylinder bank, engine design (inline vs V-type), and whether the misfire is intermittent influence both diagnosis time and replacement costs.
Advanced engine configurations, such as turbocharged or direct-injected systems, often need higher-priced coils or injectors and may require additional seals or timing work.
Labor & Installation Time
Labor time is frequently the largest driver of total cost. Quick fixes (one cylinder, single component) may take 2–3 hours, while a full intake or valvetrain inspection can exceed 5 hours.
Typical labor rates range from $90–$180 per hour depending on region and shop tier. For a 3-hour job at $140/hour, labor would be about $420.
Regional Price Differences
Prices vary by region: urban centers tend to be higher than rural areas. Diagnostic fees may be $10–$40 higher in cities, while parts margins and hourly rates often follow regional cost of living.
Example deltas: Urban +15–25%, Suburban +5–15%, Rural −5–10% relative to national averages. These ranges reflect typical shop pricing spreads across the U.S.
Real-World Pricing Examples
Three scenario cards illustrate common outcomes.
- Basic — 1 misfiring cylinder, coil and plug replaced, no injector work. Spec: direct ignition coil, 4 plugs, 1 seal kit. Labor 2.5 hours; parts $180; labor $350; total around $560.
- Mid-Range — 1 misfiring cylinder with a faulty injector; replace coil, plug, and injector. Labor 3.5 hours; parts $420; labor $480; total around $900.
- Premium — 2 cylinders affected with several replaced components, plus injector cleaning or replacement and a gasket set. Labor 5–6 hours; parts $700; labor $700; total around $1,900.
Cost By Region
Regional variations can shift totals by roughly ±20% from national averages. City garages often skew higher, while rural shops may offer modest discounts for same-day service on standard misfire diagnostics.
What Drives Price
Key drivers include: engine configuration, number of cylinders, accessibility of the cylinder bank, and the need for multiple part replacements or engine-related work beyond basic misfire causes.
Additional & Hidden Costs
Hidden costs may appear as diagnostic retests or repeat visits. Some shops charge a diagnostic recheck if the customer returns with the same issue after initial repair, and there may be disposal or shop supplies fees.
Ways To Save
Saving strategies focus on accurate diagnosis and selective parts. If a misfire is confirmed and a single component is clearly faulty, replacing only that part rather than the entire ignition bank can reduce cost substantially.
Consider obtaining a written estimate that itemizes parts and labor, and ask about warranty coverage on replaced components to safeguard against future failures.