Ignition and misfires code · Phoenix area, Arizona
P0300 repair cost in Phoenix
P0300 means random or multiple cylinder misfires. In the Phoenix area, Arizona, the most common fix, spark plug replacement, has a typical range of $85 to $510. Short trips only.
How this range is built
| Part of the job | Low | High |
|---|---|---|
| Parts | $20 | $120 |
| Labor: 0.6 to 2.5 hours × $110 to $150 an hour | $66 | $375 |
| Fees: shop supplies, disposal, diagnostics | $0 | $15 |
| Total, rounded | $85 | $510 |
The hourly rate is the BLS Occupational Employment and Wage Statistics, May 2025 average pay for this trade in Phoenix, $27.56 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 Phoenix is different
The parts cost about the same everywhere. The labor rate is what changes. Auto technicians in the Phoenix area, Arizona earn an average of $27.56 an hour, so a shop there bills roughly $110 to $150 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 | $95 to $580 |
| New York City area | $90 to $550 |
| Los Angeles area, California | $90 to $560 |
| Chicago area, Illinois | $85 to $530 |
| Houston area, Texas | $80 to $500 |
| Dallas-Fort Worth area, Texas | $80 to $500 |
| Atlanta area, Georgia | $85 to $530 |
| Miami area, Florida | $80 to $510 |
| Seattle area, Washington | $95 to $560 |
What the code means, causes and what to check first are on the P0300 page.
Not a repair shop, estimates only. Typical range, estimate. Prices updated October 2026.