The spark plug gap for a 2015 Honda Accord is 0.043 inches (1.1 mm) for most engines when using standard, pre-gapped replacement plugs.
Engine options and gap specification
The standard reference gap for the 2015 Accord across its common engines is 0.043 inches (1.1 mm) when installing typical replacement plugs. This baseline applies to both the 2.4L inline-4 and the 3.5L V6, though individual plug brands may ship pre-gapped differently.
- 2.4L inline-4 engine (i-VTEC): gap commonly 0.043 inches (1.1 mm)
- 3.5L V6 engine: gap commonly 0.043 inches (1.1 mm)
- Plug types and pre-gap considerations: some aftermarket plugs may be pre-gapped differently; verify and adjust to 0.043 inches (1.1 mm) if needed
In practice, most technicians and Honda manuals default to 0.043 inches (1.1 mm) for replacement plugs on the 2015 Accord, but always confirm based on the exact plug model you install.
How to check and set the spark plug gap
Follow these steps to verify and adjust the gap if you’re replacing plugs yourself. Have the correct tools ready: a spark plug socket, a gap gauge (0.043 inches / 1.1 mm), a torque wrench, and the replacement plugs recommended for your engine.
- Disconnect the negative battery cable for safety before working on ignition components.
- Carefully remove the spark plug from the cylinder using a proper spark plug socket.
- Measure the gap with a gauge. If the gauge does not slide in cleanly at 0.043 inches (1.1 mm), gently bend the ground electrode or choose a plug with the correct pre-gap and re-measure.
- Install the plug and tighten to the manufacturer’s torque specification for the 2015 Accord. Re-check the gap after tightening if your plugs were adjusted.
- Repeat for all cylinders, then reattach ignition coils/wires and reconnect the battery.
If you’re using OEM pre-gapped plugs, you may skip the gap adjustment step, but always verify the packaging and confirm the torque specification during installation.