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 MANUALSLEXUS1999RX 300 AWD V6-3.0L (1MZ-FE)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTIGNITION SYSTEMKNOCK SENSORSERVICE AND REPAIR
1999 Lexus RX 300 AWD V6-3.0L (1MZ-FE)
Knock Sensor: Service and Repair
1999 Lexus RX 300 AWD V6-3.0L (1MZ-FE)SECTION Service and Repair
INSPECTION
1. REMOVE AIR CLEANER HOSE
2. REMOVE RH ENGINE MOUNTING STAY
3. REMOVE INTAKE MANIFOLD ASSEMBLY AND WATER OUTLET
4. REMOVE KNOCK SENSORS
a. Disconnect the knock sensor connector.
b. Using SST, remove the knock sensor.
SST 09817-16011
5. INSPECT KNOCK SENSORS
Using an Ohmmeter, check that there is no continuity between the terminal and body.
If there is continuity, replace the sensor.
6. REINSTALL KNOCK SENSORS
a. Using SST, install the knock sensor.
SST 09817-16011
Torque: 39 N.m (400 kgf.cm, 29 ft.lbf)
b. Connect the knock sensor connector.
7. REINSTALL WATER OUTLET AND INTAKE MANIFOLD ASSEMBLY
8. REINSTALL RH ENGINE MOUNTING STAY
9. REINSTALL AIR CLEANER HOSE
1. REMOVE AIR CLEANER HOSE
2. REMOVE RH ENGINE MOUNTING STAY
3. REMOVE INTAKE MANIFOLD ASSEMBLY AND WATER OUTLET
4. REMOVE KNOCK SENSORS
a. Disconnect the knock sensor connector.
b. Using SST, remove the knock sensor.
SST 09817-16011
5. INSPECT KNOCK SENSORS
Using an Ohmmeter, check that there is no continuity between the terminal and body.
If there is continuity, replace the sensor.
6. REINSTALL KNOCK SENSORS
a. Using SST, install the knock sensor.
SST 09817-16011
Torque: 39 N.m (400 kgf.cm, 29 ft.lbf)
b. Connect the knock sensor connector.
7. REINSTALL WATER OUTLET AND INTAKE MANIFOLD ASSEMBLY
8. REINSTALL RH ENGINE MOUNTING STAY
9. REINSTALL AIR CLEANER HOSE
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.