Repair cost
P0300 Repair Cost: Typical Price Range and What Affects It
P0300 repair cost changes with the misfire source. Spark plugs or coils can be straightforward, but random misfires from fuel, vacuum, timing, or compression problems need broader testing.
Repair range
$100-$1,800
Parts range
$35-$1,404
Labor time
1-2.5 hours
Cost Summary
P0300 repair cost changes with the misfire source. Spark plugs or coils can be straightforward, but random misfires from fuel, vacuum, timing, or compression problems need broader testing.
Common Repair Scenarios
- Ignition inspection and plug replacement
- Ignition coil testing or replacement
- Vacuum leak or air intake repair
- Fuel injector or pressure diagnosis
- Compression or timing diagnosis for persistent misfires
What Changes The Cost
- Cylinder access and plug labor
- Number of coils or plugs replaced
- Fuel injector access
- Need for compression testing
- Risk of catalytic converter damage from continued driving
Regional And Quote Guidance
Misfire costs track labor time more than the code number. Dense engine bays and higher hourly rates make plug, coil, and injector access more expensive.
Get a second opinion if the estimate skips ignition testing, does not identify whether the light is flashing, or recommends major engine work before compression data is shown.
Related Diagnostic Page
FAQ
Why is P0300 repair cost such a wide range?
The same code can come from a low-cost fault or an expensive component, so diagnosis changes the final price.
Should I approve the most expensive P0300 repair right away?
Not usually. Ask what tests confirmed the part and whether related codes or simple causes were ruled out.
Does region affect the estimate?
Yes. Labor rates, diagnostic fees, parts availability, and local emissions requirements can change the price.