On the 10th-gen Accord, all three powertrains — the 1.5 turbo, the 2.0 turbo and the Hybrid's Atkinson 2.0 — use four coil-on-plug ignition coils sitting in a straight line under a plastic engine cover. Nothing has to be pulled off the intake side, so this is genuinely a one-ratchet job: cover off, four connectors unclipped, four small coil bolts out, four plugs out with a thin-wall 14 mm plug socket on a 6 in extension.
The two things people get wrong are torque and cleanliness. Honda's spec is around 13 ft-lb, which feels almost undone compared to older cars, and people crank plugs into a hot aluminum head until the threads give. Second, they yank the coils and go straight in with a socket without blowing the wells out, and grit falls past the plug into the cylinder. Let the engine cool fully, clean each well, and torque with a wrench that actually reads accurately down in the low teens.
| Item | Type | |
|---|---|---|
| Socket set 10 mm socket, 1/4 or 3/8 in drive Removes the plastic engine cover fasteners and any cover bracket/stud nuts. | Required | shop |
| Trim tool set Plastic pry tools Pops the cover grommets and unclips wiring looms without breaking plastic tabs. | Recommended | shop |
| Compressed air or shop vacuum Blow gun with extension nozzle Clears dirt and grit from the plug wells before the plugs come out. | Recommended | shop |
| Ratchet 3/8 in drive, standard length Main driver for coil bolts and plugs. | Required | shop |
| Socket 8 mm 6-point, 3/8 in drive (some coils use 10 mm) Removes the single retaining bolt on each ignition coil. | Required | shop |
| Extension set 3/8 in drive, 3 in and 6 in Reaches down the plug tubes and clears the cam cover. | Required | shop |
| Spark plug socket 14 mm (9/16 in) thin-wall, magnetic or rubber insert, 3/8 in drive The only socket that fits the narrow plug tubes on these engines. | Required | shop |
| Swivel / wobble extension 3/8 in drive wobble, 3 in Helps line up the socket squarely if access is tight on the firewall-side plugs. | Recommended | shop |
| Torque wrench 3/8 in drive, 5-80 ft-lb (need accuracy near 13 ft-lb) Sets plug torque exactly — aluminum heads strip easily. | Required | shop |
| Spark plug gap tool Wire/feeler gauge Only to verify the factory gap; never bend a fine-wire iridium tip. | Recommended | shop |
| Spark plugs OE iridium, set of 4 — match to your engine (1.5T L15BE, 2.0T K20C4, or Hybrid LFA/LFB); verify part number with a Honda parts lookup The wear item being replaced; gap is factory-set, install as supplied. | Parts | shop |
| Dielectric grease Silicone, small tube Thin film inside each coil boot so they release next time. | Consumables | shop |
| Anti-seize (optional) Nickel-based, tiny amount Honda does not require it; if used, apply only a trace and reduce torque slightly. | Consumables | shop |
| Brake cleaner or contact cleaner Aerosol Cleans oil or coolant residue off the cover and coil area. | Consumables | shop |
| Shop towels Keeps grit out of open cylinders and wipes the plug wells. | Consumables | shop |
| Safety glasses Debris blows out of the plug wells at eye level. | Safety | shop |
| Nitrile gloves Keeps oil off hands and off the coil boots. | Safety | shop |
Socket sizes are effectively the same across the generation: 14 mm thin-wall plug socket, 8 mm coil bolts, 10 mm engine cover hardware. Differences are in the plugs themselves — the 1.5T (L15BE), 2.0T (K20C4) and Hybrid (LFA/LFB) all use different OE iridium part numbers and heat ranges, so look yours up by VIN rather than assuming one set fits all. The 2.0T also has a slightly busier cover bracket and loom routing on top, adding a couple of minutes.
| Spark plugs (all 10th-gen Accord engines) | About 13 ft-lb (18 Nm) — verify in the service manual for your engine code |
| Ignition coil retaining bolt | About 7 ft-lb (9-10 Nm) — verify in the service manual |
| Engine cover fasteners | Snug by hand, roughly 6-7 ft-lb (8-9 Nm) |
The 14 mm thin-wall plug socket, 8 mm (occasionally 10 mm) coil bolt and 10 mm cover fasteners are correct for the 10th-gen 4-cylinder layout, but confirm your exact plug part number and torque figure against the Honda service info for your engine code (L15BE, K20C4, or LFA/LFB hybrid) before buying.
A 14 mm (9/16 in) thin-wall spark plug socket on 3/8 in drive, with a magnetic or rubber plug retainer, plus a 6 in extension. A standard-wall 14 mm socket may not clear the plug tubes.
Honda's iridium plugs are rated around 100,000 miles, and the Maintenance Minder will call for them. If your 1.5T has a history of short trips, oil dilution or cold-climate fuel wash, pulling them at 60,000 miles to inspect is worth doing.
No. On all three engines the coils and plugs are accessible once the plastic engine cover is off. Only wiring clips and the cover brackets need to come loose.
Roughly 13 ft-lb (18 Nm) for these M12 fine-wire plugs — verify in the service manual for your engine code. The head is aluminum, so use a torque wrench rather than guessing by feel.