A single-cylinder misfire code (P0301 through P0308) with a shaking engine is most often a failed coil-on-plug ignition coil. We swap coils between cylinders to confirm the fault follows the coil, then replace it with an OEM-quality part and a fresh plug.
Signs you need ignition coil replacement
- Flashing check engine light
- Engine shakes at idle
- Loss of power going uphill
- Misfire code for a specific cylinder
- Raw fuel smell from the exhaust
What we do on site
- Read the misfire counter and identify the cylinder
- Swap the suspect coil to another cylinder to confirm
- Replace the coil, plug, and boot
- Clear codes and verify smooth running
Doing this in a driveway
Quick driveway job on nearly every engine. Rear-bank coils on some V6s take longer.
Parts we use
OEM-quality ignition coil, spark plug, coil boot.
Pricing: Low to moderate per coil; replacing the full set on a high-mileage engine is often the economical move. Every job is quoted in writing before we start, and there's no upsell — how our pricing works.
FAQ
Ignition Coil Replacement: common questions
Should I keep driving with a misfire?
No, especially if the light is flashing. Unburned fuel destroys catalytic converters, which cost far more than a coil.
Why do coils fail?
Heat, age, oil in the plug wells, and worn plugs that make the coil work harder. That's why we replace the plug and check the well when we do a coil.