For a 2015 Honda CR-V with the 2.4-liter four-cylinder engine, you’ll need a 5/8-inch spark plug socket (16 mm hex) with a rubber insert, used with a 3/8-inch drive ratchet. This size matches the plug hex used by this engine and is the standard choice for many Honda four-cylinders.
The spark plugs on the 2015 CR-V are accessed from the top of the engine bay, and space around the rear plugs can be tight. You may need a wobble extension or a universal joint to reach them. Gather the right socket and extensions, and follow the manufacturer’s torque specification when reinstalling the plugs.
Engine context and why the size matters
The 2015 CR-V’s 2.4L four-cylinder uses spark plugs with a 5/8-inch hex. Using the correct socket ensures a proper grip and reduces the risk of rounding off the plug’s hex. Using the wrong size can strip the plug or slip, especially in tight spaces.
Tools and parts you'll need
Before you begin, assemble the following items so you can complete the job smoothly.
- 5/8-inch spark plug socket with rubber insert
- 3/8-inch drive ratchet
- One or two long extensions (6–12 inches) or a wobble extension
- Flexible or universal joint if space is tight
- Torque wrench capable of applying the manufacturer’s torque spec
- New spark plugs matched to the 2.4L engine (check Honda/NGK/Denso specifications)
- Dielectric grease for the boots (optional but helpful for sealing)
- Owner’s manual or service manual reference for torque values and plug gap specs
When you’re done, avoid applying anti-seize on modern spark plugs unless the manufacturer explicitly says so. Use the recommended plugs and torque values from Honda’s guidance to ensure proper sealing and performance.
Installation tips
Follow these steps to replace the plugs safely and correctly.
- Disconnect the negative battery terminal if you’ll be working near electrical components.
- Remove any engine covers or components obstructing access to the spark plugs.
- Label and disconnect ignition coil connectors, then carefully lift them away from the plugs.
- Thread the new spark plugs by hand to avoid cross-threading, then tighten to the manufacturer’s torque specification with a torque wrench.
- Reconnect ignition coils and any removed components, then reinstall covers.
After installation, double-check connections and start the engine briefly to confirm there are no misfires or leaks. Replace gaskets or seals if you notice any issues.
Summary
The 2015 Honda CR-V uses a 5/8-inch spark plug socket (16 mm hex). A 3/8-inch drive ratchet with a rubber-insert socket, plus extensions or a wobble joint, will help you reach all four plugs. Gather the correct plugs and follow the OEM torque specifications for a proper seal and optimal performance.