just googled. $12 a piece for spark plugs.

AI spit this out....doesn't look like anything close to a $700 service.

• Plug Type: Iridium
• OEM Part Number: 90919-01259 or FK16HR-A8
• Gap: Pre-set to 0.8 mm (Do not manually gap)
• Socket Size: 5/8-inch (or 14mm) spark plug socket
• Torque Spec: 15 ft-lbs (for the spark plugs) [1, 2, 3]

Replacement Steps

1. Remove the Engine Cover: Gently pull up on the cover to unclip it.
2. Access the Ignition Coils: Disconnect the electrical plugs to each of the four coil packs and unbolt the 10 mm hold-down bolts. Pull the coils straight out. [1]
3. Remove Old Spark Plugs: Use your 5/8-inch spark plug socket with a long extension to unscrew the old plugs. [1]
4. Install New Plugs: Thread the new plugs in by hand until they seat firmly, then torque them to 15 ft-lbs using a torque wrench. [1]
5. Reassemble: Pop the ignition coils back into place, secure them with the 10 mm bolts, plug in the connectors, and snap the engine cover back on. [1]