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How to Change a Knock Sensor in a 98 Accord

by Don Bowman

The knock sensor on a 1998 Honda Accord is designed to sense pre-ignition in the cylinders. Honda engines operate with high levels of ignition timing advance for more power and fuel economy. This leaves little margin for increased cylinder head temperatures because of fuel type, carbon deposits, cooling system abnormalities and load as well as other factors. A resounding “knocking” in the engine can identify pre-ignition. Pre-ignition is harmful because of the stress it places on internal components. The knock sensor signals the computer of this situation, which retards the spark until the knock is eliminated.

Step 1

Disconnect the negative battery cable using a socket and ratchet.

Step 2

Locate the knock sensor. The ‘98 Honda Accord has two engines available: the 2.3 and 3.0 liter. Both engines place the knock sensor under the rear of the engine, just above the oil filter.

Step 3

Squeeze the electrical connector release tab, then pull the connector off of the knock sensor. Unscrew the sensor from the engine using a deep well socket and ratchet

Step 4

Thread the new sensor into the engine by hand. Torque the sensor to 31 foot-pounds using a torque wrench. Plug the electrical connector into the sensor.

Connect the negative battery cable. Insert the radio security code into the radio. The code is located on a card in the owner's manual packet.

Items you will need

  • Deep well socket set
  • Ratchet
  • Torque wrench

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