On the 10th-gen Civic this is one of the easiest jobs on the car. All four coil-on-plug coils sit right on top of the valve cover, so you remove the plastic cover, pull four connectors and four bolts, and the plugs are straight down in the tubes. The 2.0L K20C2 is the more open of the two; the 1.5L turbo L15B7 has intake and charge piping plus a harness running across the valve cover that you need to move first, which adds maybe 20 minutes.
The things people get wrong: doing it warm, and over-torquing. The head is aluminum and 13 ft-lb feels loose if you are used to guessing, but that is the spec. Always start plugs by hand with the socket on a bare extension so you feel the threads engage, and never try to re-gap the factory iridium plugs.
| Item | Type | |
|---|---|---|
| Socket wrench set 3/8 in drive ratchet Drives all the covers, coil bolts and plug socket. | Required | shop |
| Socket 10 mm, 3/8 in drive Engine cover bolts, intake duct bracket and coil retaining bolts. | Required | shop |
| Socket 8 mm, 1/4 in drive Some 1.5T coil and bracket fasteners are 8 mm. | Recommended | shop |
| Extension set 3/8 in drive, 3 in and 6 in Reaches the plugs down in the valve cover tubes. | Required | shop |
| Spark plug socket 14 mm (9/16 in) thin-wall, magnetic or rubber insert, 3/8 in drive Only a thin-wall plug socket fits the narrow plug tubes and holds the plug for install. | Required | shop |
| Swivel/wobble extension or universal joint 3/8 in drive Helps clear the 1.5T charge piping when lifting coils out. | Recommended | shop |
| Torque wrench 3/8 in drive, 5-25 ft-lb range Plugs thread into aluminum head; 13 ft-lb must be set accurately. | Required | shop |
| Flat trim tool / small pry tool Plastic Pops the coil connector locks and engine cover grommets without breaking them. | Recommended | shop |
| Hose clamp pliers or flat screwdriver For spring/worm clamps on 1.5T intake piping Loosens the intake duct that crosses over the 1.5T valve cover. | Recommended | shop |
| Compressed air or vacuum with nozzle Blows dirt out of the plug wells before removing plugs. | Recommended | shop |
| Spark plug gap gauge Wire-type Only to verify factory gap (1.5T ~0.9 mm, 2.0L ~1.1 mm); never bend iridium tips. | Recommended | shop |
| Spark plugs 1.5T L15B7: NGK DILZKAR7A9 (Honda 12290-59B-003); 2.0L K20C2: NGK ILZKAR7B11 (verify by VIN) The replacement plugs — use OEM-spec iridium only. | Parts | shop |
| Dielectric grease Silicone Thin film inside the coil boot to prevent sticking and arcing. | Consumables | shop |
| Anti-seize Nickel, optional and very sparing Optional trace on threads only; Honda plugs come pre-plated so most techs skip it. | Consumables | shop |
| Shop rags Keeps debris out of open plug holes. | Consumables | shop |
| Mechanic's gloves Engine must be cool, but protects hands on tight metal edges. | Safety | shop |
Both engines use the same 14 mm (9/16 in) thin-wall plug socket and 13 ft-lb plug torque. Coil and cover bolts are 10 mm on the 2.0L; the 1.5T uses a mix of 10 mm and 8 mm and additionally requires removing the intake duct/charge pipe over the valve cover. Plug part numbers differ: NGK DILZKAR7A9-type for the 1.5T, ILZKAR7B11-type for the 2.0L.
| Spark plug (both engines) | 13 ft-lb (18 Nm) |
| Ignition coil mounting bolt | 7 ft-lb (9.8 Nm) |
| Engine cover / intake duct 10 mm bolts | 7 ft-lb (9.8 Nm) |
The 14 mm thin-wall plug socket, 10 mm fasteners and 18 Nm plug torque are correct for both 10th-gen engines, but confirm the exact plug part number for your VIN and model year at the parts counter, since Honda revised the 1.5T plug spec during this generation.
Honda lists roughly 100,000 miles for the iridium plugs on both engines. Many 1.5T owners change them earlier, around 60,000-75,000 miles, especially if the car sees short trips or has a tune, because fouling and misfires show up sooner.
A 14 mm (9/16 in) thin-wall spark plug socket on a 3/8 in drive, with a 6 in extension. A standard-wall plug socket often will not fit down the valve cover tubes.
No. You only need to remove the engine cover and loosen or unbolt the intake duct/charge pipe and harness that run across the top of the valve cover. The coils are accessible from above.
13 ft-lb (18 Nm) for both the 2.0L and 1.5T. Torque coil bolts to about 7 ft-lb; do not use an impact on anything here.