Repair costs for a cylinder four misfire vary based on diagnostics, ignition components, injectors, and labor time. The price range reflects different causes, from faulty spark plugs and coils to cylinder wall damage or injector failure. Understanding cost factors helps buyers estimate a realistic budget and avoid surprises. This article outlines typical prices, drivers, and savings options for U.S. buyers.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| Diagnostic scan | $80 | $120 | $150 | Includes code read and basic inspection |
| Coil pack replacement (cylinder 4) | $120 | $230 | $360 | Single coil; labor varies by access |
| Spark plugs (4) and wires | $40 | $120 | $240 | Depend on brand and engine type |
| Fuel injector cleaning/repair | $150 | $250 | $350 | May require replacement if clogged |
| Labor | $180 | $480 | $1,000 | Typical 2–5 hours at $90–$180/hr |
| Misc. parts and fluids | $50 | $120 | $200 | O-rings, gaskets, oil/filter |
Overview Of Costs
Typical cost range for Cylinder 4 misfire repair spans roughly $400 on the low end to about $1,800 or more for complex cases. The total depends on diagnostic depth, affected components, and whether the misfire is due to ignition, fuel, or compression issues. Expect per-unit considerations such as a single coil pack at $120–$360 or four spark plugs at $20–$60 each. Complex fixes or labors on higher-end engines can push the price toward the upper end.
Cost Breakdown
| Materials | Labor | Equipment | Permits | Contingency | Taxes |
|---|---|---|---|---|---|
| $60–$260 | $180–$600 | $40–$120 | $0 | $40–$120 | $15–$50 |
Assumptions: region, engine type, and labor rates vary by shop; diagnostic scope may expand if computer reflash or O2 sensors are involved.
What Drives Price
Key price drivers include the ignition system layout, cylinder head accessibility, and the complexity of the misfire cause. Ignition components such as coil packs and spark plugs can cause immediate price jumps if multiple parts are replaced together. Engines with direct injection or turbocharging generally incur higher labor and part costs due to tighter workspace and special tools. Diagnostic depth matters: a basic check may identify misfire code P0304, but deeper investigation often reveals worn valve seats or a faulty injector, which raises both parts and labor charges.
Pricing Variables
Regional pricing differences can shift costs by ±10–25 percent. Labor rates and locally required emissions testing or inspections influence the final bill. Seasonal demand, vehicle age, and warranty coverage also affect price.*
Ways To Save
Shop for a diagnostic upfront to confirm the exact cause before replacing parts. If the same misfire recurs after a single-part replacement, get a diagnostic retest rather than continuing to exchange components. Ask for a breakdown and shop around for coil packs and spark plugs to compare brands and warranties. Consider bundled maintenance that includes spark plugs, coils, and fuel system cleaning when recommended by the technician.
Regional Price Differences
Prices vary by region and market conditions. In the Midwest, diagnostic and part costs tend to be moderate; in the Northeast, higher labor rates can push totals up; in the South and rural areas, lower overhead often reduces final pricing. Typical regional delta ranges from -10% to +15% compared with national averages.
Labor & Installation Time
Labor for cylinder four misfire repair commonly spans 2–5 hours depending on accessibility and parts involved. For a straightforward coil and plug replacement, time may be shorter; for injector work or head access, expect longer durations. Assuming a typical shop rate of 90–180 per hour and no special tools required. labor_hours × hourly_rate
Additional & Hidden Costs
Hidden costs can include shop diagnostics beyond the initial scan, core return fees for certain parts, core charge on coil packs, disposal fees for oil change, and supplemental tests after initial repair. Some vehicles require a timing belt or chain inspection if the misfire prompts broader engine concerns. Always request a full written estimate with itemized parts and labor.
Real-World Pricing Examples
Three scenario cards illustrate how the price might look in practice.
- Basic — misfire P0304 caused by faulty coil; 1 coil, 4 plugs, diagnostic; 2 hours labor; total around $320–$520.
- Mid-Range — coil pack plus spark plugs and minor injector cleaning; 3 hours labor; total around $540–$980.
- Premium — coil pack, injectors cleaned or replaced, potential gasket/valve work; 4–5 hours labor; total around $1,000–$1,800+
Assumptions: region, specs, labor hours.