Ignition and misfires code · Chicago area, Illinois
P0304 repair cost in Chicago
P0304 means cylinder 4 misfire. In the Chicago area, Illinois, the most common fix, ignition coil replacement (one coil), has a typical range of $75 to $330.
Wide range: this job varies a lot. Itemize your quote for a better answer.
How this range is built
| Part of the job | Low | High |
|---|---|---|
| Parts | $30 | $120 |
| Labor: 0.4 to 1.2 hours × $115 to $155 an hour | $46 | $186 |
| Fees: shop supplies, disposal, diagnostics | $0 | $15 |
| Total, rounded | $75 | $330 |
The hourly rate is the BLS Occupational Employment and Wage Statistics, May 2025 average pay for this trade in Chicago, $28.52 an hour, times 4 to 5.5 to cover what a shop bills (overhead, tools, insurance, profit). Parts are a band from budget aftermarket to the manufacturer part. Full method.
Not a repair shop, estimates only. Typical range, estimate. Not a quote. Your car, parts and shop change the number.
Why Chicago is different
The parts cost about the same everywhere. The labor rate is what changes. Auto technicians in the Chicago area, Illinois earn an average of $28.52 an hour, so a shop there bills roughly $115 to $155 an hour. That moves this repair's total, and the range above already includes it.
Same repair in other areas
| Area | Typical range, estimate |
|---|---|
| Boston area, Massachusetts | $80 to $350 |
| New York City area | $75 to $340 |
| Los Angeles area, California | $75 to $340 |
| Houston area, Texas | $70 to $310 |
| Dallas-Fort Worth area, Texas | $70 to $310 |
| Phoenix area, Arizona | $70 to $320 |
| Atlanta area, Georgia | $75 to $330 |
| Miami area, Florida | $70 to $320 |
| Seattle area, Washington | $80 to $340 |
What the code means, causes and what to check first are on the P0304 page.
Not a repair shop, estimates only. Typical range, estimate. Prices updated October 2026.