The ignition coil is responsible for converting the battery’s low voltage into the high voltage needed to create a spark in the spark plugs. Without a functioning ignition coil, your engine will misfire, run poorly, or fail to start. Replacing a faulty ignition coil restores smooth engine performance and fuel efficiency.

What is an ignition coil replacement?

This service involves removing the faulty ignition coil and installing a new one. Many vehicles have one coil per cylinder, while some have a single coil serving multiple cylinders. The mechanic will ensure the correct type is fitted for your engine.

Why do you need an ignition coil replacement?

A bad ignition coil prevents spark plugs from firing correctly, which leads to misfires, loss of power, and increased fuel consumption. Driving with a failing coil can also damage the catalytic converter over time.

Common signs you need an ignition coil replacement

• Engine misfires or runs rough
• Poor acceleration or reduced power
• Difficulty starting the vehicle
• Check Engine Light illuminated
• Decreased fuel economy
• Strong fuel smell from the exhaust

What happens during an ignition coil replacement?

A mechanic will:

1. Scan the vehicle for fault codes
2. Inspect ignition coils, spark plugs, and wiring
3. Remove the faulty ignition coil(s)
4. Install new ignition coil(s) of the correct type
5. Test engine performance and clear error codes

How much does an ignition coil replacement cost?

Ignition coil replacement typically costs $200–$450 per coil. Full set replacement may cost $800–$1,200+ depending on the vehicle and number of cylinders.

Is it unsafe to drive with a faulty ignition coil?

Yes. A bad ignition coil can cause stalling, poor acceleration, or engine misfires, which affect safety and reliability. It should be replaced promptly to prevent further engine or catalytic converter damage.