How to Change a Knock Sensor in a 98 Accordby 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.
Disconnect the negative battery cable using a socket and ratchet.
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.
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
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.
Things You'll Need
- Deep well socket set
- Torque wrench
Don Bowman has been writing for various websites and several online magazines since 2008. He has owned an auto service facility since 1982 and has over 45 years of technical experience as a master ASE tech. Bowman has a business degree from Pennsylvania State University and was an officer in the U.S. Army (aircraft maintenance officer, pilot, six Air Medal awards, two tours Vietnam).