Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSSUBARU1996LEGACY WAGON 4WD F4-2.2L SOHCREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSKNOCK SENSORSERVICE AND REPAIR
1996 Subaru Legacy Wagon 4WD F4-2.2L SOHC
Knock Sensor: Service and Repair
1996 Subaru Legacy Wagon 4WD F4-2.2L SOHCSECTION Service and Repair
Knock Sensor
REMOVAL
2200 cc MODEL
1. Disconnect battery ground cable from battery ground terminal.
2. Remove air intake chamber.
3. Remove band clip which fastens engine harness to engine coolant hose.
4. Disconnect knock sensor connector.
5. Remove knock sensor from cylinder block.
2500 cc MODEL
1. Disconnect battery ground cable from battery ground terminal.
2. Remove air intake chamber.
3. Remove operating cylinder. (MT vehicle only)
NOTE: Place the operating cylinder where it will not interfere with the work in process.
4. Remove band clip which fastens engine harness to engine coolant hose.
5. Disconnect knock sensor connector.
6. Remove knock sensor from cylinder block.
INSTALLATION
2200 cc MODEL
1. Install knock sensor to cylinder block.
Tightening torque:
23.5 ± 2.9 N.m (2.4 ± 0.3 kg-m, 17.3 ± 2.1 ft-lb)
NOTE: The extraction area of the knock sensor cord must be positioned at a 450 angle relative to the engine rear.
2. Connect knock sensor connector.
NOTE: The knock sensor cord must pass between the engine harness and engine coolant hose.
3. Fasten engine harness to engine coolant hose with band clip.
NOTE: Make sure that the throttle linkage does not interfere with other parts in the operating area.
4. Install air intake chamber.
5. Connect battery ground cable to battery ground terminal.
2500 cc MODEL
1. Install knock sensor to cylinder block.
Tightening torque:
23.5 ± 2.9 N.m (2.4 ± 0.3 kg-m, 17.3 ± 2.1 ft-lb)
NOTE: The extraction area of the knock sensor cord must be positioned at a 450 angle relative to the engine rear.
2. Connect knock sensor connector.
NOTE: The connector must be connected to the engine front end of the engine coolant hose.
3. Fasten engine harness to engine coolant hose with band clip.
NOTE: Make sure that the throttle linkage does not interfere with other parts in the operating area.
4. Install operating cylinder. (MT vehicle only)
Tightening torque:
37 ± 3 N.m (3.8 ± 0.3 kg-m, 27.3 ± 2.2 ft-lb)
NOTE: Apply grease to contact point of release lever and operating cylinder rod.
5. Install air intake chamber.
6. Connect battery ground cable to battery ground terminal.
REMOVAL
2200 cc MODEL
1. Disconnect battery ground cable from battery ground terminal.
2. Remove air intake chamber.
3. Remove band clip which fastens engine harness to engine coolant hose.
4. Disconnect knock sensor connector.
5. Remove knock sensor from cylinder block.
2500 cc MODEL
1. Disconnect battery ground cable from battery ground terminal.
2. Remove air intake chamber.
3. Remove operating cylinder. (MT vehicle only)
NOTE: Place the operating cylinder where it will not interfere with the work in process.
4. Remove band clip which fastens engine harness to engine coolant hose.
5. Disconnect knock sensor connector.
6. Remove knock sensor from cylinder block.
INSTALLATION
2200 cc MODEL
1. Install knock sensor to cylinder block.
Tightening torque:
23.5 ± 2.9 N.m (2.4 ± 0.3 kg-m, 17.3 ± 2.1 ft-lb)
NOTE: The extraction area of the knock sensor cord must be positioned at a 450 angle relative to the engine rear.
2. Connect knock sensor connector.
NOTE: The knock sensor cord must pass between the engine harness and engine coolant hose.
3. Fasten engine harness to engine coolant hose with band clip.
NOTE: Make sure that the throttle linkage does not interfere with other parts in the operating area.
4. Install air intake chamber.
5. Connect battery ground cable to battery ground terminal.
2500 cc MODEL
1. Install knock sensor to cylinder block.
Tightening torque:
23.5 ± 2.9 N.m (2.4 ± 0.3 kg-m, 17.3 ± 2.1 ft-lb)
NOTE: The extraction area of the knock sensor cord must be positioned at a 450 angle relative to the engine rear.
2. Connect knock sensor connector.
NOTE: The connector must be connected to the engine front end of the engine coolant hose.
3. Fasten engine harness to engine coolant hose with band clip.
NOTE: Make sure that the throttle linkage does not interfere with other parts in the operating area.
4. Install operating cylinder. (MT vehicle only)
Tightening torque:
37 ± 3 N.m (3.8 ± 0.3 kg-m, 27.3 ± 2.2 ft-lb)
NOTE: Apply grease to contact point of release lever and operating cylinder rod.
5. Install air intake chamber.
6. Connect battery ground cable to battery ground terminal.
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.