This is the engine KNOCK SENSOR. It determines if the engine is experiencing spark pre-ignition in the cylinders.
SWITCH ASSY., OIL PRESSURE (DENSO)
OIL SEAL (80X98X10) (NOK)
WASHER, DRAIN PLUG (14MM)
94109-14000 Drain plug Crush Washer It is recommended to replace this 14mm crush washer on the Oil Drain Plug bolt EVERY time you change the oil in your Honda or Acura vehicle! This stops those pesky oil drips in the driveway that everyone hates. Change your Engine Oil like a PRO and replace the Oil Drain Plug crush washer every time.