Conducts high-voltage electrical current from the ignition coil or distributor cap to the spark plugs, delivering the energy needed to create a spark for combustion in each cylinder.
$50 – $200 (set)
Total Cost
60,000 – 100,000 miles (if applicable)
Replace Interval
Easy
DIY Difficulty
Schedule Soon
If It Fails
Spark plug wires (also called ignition cables or HT leads) carry high-voltage electricity from the distributor or ignition coil to the spark plugs. Modern cars with coil-on-plug ignition don't have traditional spark plug wires.
Parts Cost
$20 – $100 (full set)
Labor Cost
$30 – $100
Replace with spark plugs during a tune-up, or when misfires are traced to wire failure. Always replace as a complete set.