What's involved
What this repair actually is.
The failed coil-on-plug unit is removed and replaced; spark plugs are often replaced at the same time.
Symptoms
How you can tell.
- Misfire codes
- Rough idle
- Power loss under load
If you delay
Persistent misfire can damage the catalytic converter.
Maintenance tip
Replace plugs on schedule to extend coil life.
Educational estimate. Real pricing depends on your vehicle, the inspection, parts availability, taxes, and shop rates. Use this as a guide while you shop quotes.
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