What size socket for CRV spark plugs?
Typically, a 5/8-inch (16 mm) spark plug socket covers most CR-V spark plugs; however, some engine variants and plug designs require a 13/16-inch (21 mm) socket. This guide explains which size applies to common CR‑V generations, how to verify your exact requirement, and best practices for a safe plug replacement.
Engine Variants and Likely Socket Sizes
Because the CR-V has used several engines across generations, the hex size can vary. The most common is 5/8" (16 mm). In rare cases, you may encounter 13/16" (21 mm). Use this guide as a starting point, and verify against your year and engine code.
- 5/8 inch (16 mm) hex spark plugs: The overwhelming majority of CR-V engines use this size for the spark plug hex, including many B-series, K-series, and the newer 1.5L turbo variants.
- 13/16 inch (21 mm) hex: A small number of special or older plug designs may require this size. If a 5/8" socket won’t fit, check the plug packaging or service manual for the exact hex size.
Confirming the exact size for your specific vehicle is important because using the wrong size can strip the plug or damage the cylinder head. The best practice is to verify with the owner's manual, service manual, or the spark plug packaging you plan to install.
How to Verify the Correct Size for Your CR-V
Use these steps to confirm the right socket size for your car's spark plugs.
- Identify your engine code and year to locate the recommended spark plug specification in the service manual or Honda's official parts catalog.
- Check the spark plug you plan to install or the old plug you are removing; note the hex size listed on the packaging or manufacturing spec.
- Try a 5/8" (16 mm) spark plug socket first; if it does not engage the plug correctly, stop and verify with the exact hex size (which could be 13/16" or another size).
- Use a proper shallow or deep spark plug socket designed for use with a 3/8" drive ratchet, including a rubber insert/magnet to hold plugs securely.
- Torque the plug to the manufacturer's specification when reinstalling, using a torque wrench and avoiding anti-seize on most modern Honda engines unless specified by the manual.
Verifying with the manual ensures you won’t damage the plugs or head, and keeps your maintenance on track for reliable operation.
Tools and Tips for CR-V Spark Plug Replacement
Having the right tools and careful techniques helps complete the job safely and efficiently.
- Spark plug socket: 5/8" (16 mm) hex is the standard choice for most CR-V engines; a 13/16" (21 mm) may be needed for rare plug designs.
- Ratchet and extensions: A 3/8" drive with a flexible extension helps reach tight spaces; a swivel extension can aid access under hoses.
- Magnetic/rubber-hold spark plug socket: Helps keep the plug from dropping in the cylinder head.
- Torque wrench: Re-torque plugs to the manufacturer’s specification to avoid overtightening or under-tightening.
- Anti-seize caution: Do not use anti-seize on modern Honda spark plugs unless recommended by the service manual; it can affect torque readings.
With the proper socket and technique, CR-V spark plug replacement proceeds smoothly while protecting engine hardware.
Summary
For most Honda CR-Vs, a 5/8-inch (16 mm) spark plug socket is the standard choice. A smaller subset of engines or plug types may require a 13/16-inch (21 mm) socket. Always verify the exact hex size for your year and engine with the owner's or service manual or the spark plug packaging, and torque the plugs to the manufacturer’s specification using the correct tools. Doing so will help ensure a proper seal, reliable performance, and long plug life.
