Ignition Coil
Your engine is misfiring, running rough, or the check engine light is on, and a bad ignition coil is a common culprit. A mechanic tests each coil, finds the one that's failing, and replaces it so your engine fires smoothly again. Catching it early keeps a small problem from damaging other parts.
Find a TechnicianCommon causes
- Worn or fouled spark plugs straining the coil
- Heat and vibration breaking down coil insulation over time
- Moisture or oil leaking onto the coil
- Voltage overload from a faulty plug or wire
- Normal age and high mileage wear
Frequently asked questions
How do I know if my ignition coil is bad?
Common signs are engine misfires, rough idle, loss of power, poor fuel economy, and a flashing or steady check engine light. A diagnostic scan confirms which coil is failing.
Can I drive with a bad ignition coil?
You can, but it's risky. A misfiring engine can damage the catalytic converter and leave you stranded, so it's best to replace the coil promptly.
Do I need to replace all the coils at once?
Not always. Many cars only need the failing coil replaced, but if your vehicle has high mileage, replacing them together can save you future visits.
How it works
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