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 MANUALSLEXUS2004LX 470 V8-4.7L (2UZ-FE)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTIGNITION SYSTEMKNOCK SENSORTESTING AND INSPECTION
2004 Lexus LX 470 V8-4.7L (2UZ-FE)
Knock Sensor: Testing and Inspection
2004 Lexus LX 470 V8-4.7L (2UZ-FE)SECTION Testing and Inspection
INSPECTION
1. REMOVE V-BANK COVER
2. REMOVE INTAKE AIR CONNECTOR
3. REMOVE THROTTLE BODY FROM INTAKE MANIFOLDS
4. REMOVE UPPER AND LOWER INTAKE MANIFOLDS ASSEMBLY
5. INSPECT KNOCK SENSOR 1, 2
a. Disconnect the knock sensor connectors.
b. Using an ohmmeter, check that there is no continuity between the terminal and body.
If there is a continuity, replace the sensor with SST.
SST 09816-30010
Torque: 45 N.m (450 kgf.cm, 33 ft.lbf)
c. Reconnect the knock sensor connectors.
6. REINSTALL UPPER AND LOWER INTAKE MANIFOLDS ASSEMBLY
7. REINSTALL THROTTLE BODY TO INTAKE MANIFOLDS
8. REINSTALL INTAKE AIR CONNECTOR
9. REINSTALL V-BANK COVER
1. REMOVE V-BANK COVER
2. REMOVE INTAKE AIR CONNECTOR
3. REMOVE THROTTLE BODY FROM INTAKE MANIFOLDS
4. REMOVE UPPER AND LOWER INTAKE MANIFOLDS ASSEMBLY
5. INSPECT KNOCK SENSOR 1, 2
a. Disconnect the knock sensor connectors.
b. Using an ohmmeter, check that there is no continuity between the terminal and body.
If there is a continuity, replace the sensor with SST.
SST 09816-30010
Torque: 45 N.m (450 kgf.cm, 33 ft.lbf)
c. Reconnect the knock sensor connectors.
6. REINSTALL UPPER AND LOWER INTAKE MANIFOLDS ASSEMBLY
7. REINSTALL THROTTLE BODY TO INTAKE MANIFOLDS
8. REINSTALL INTAKE AIR CONNECTOR
9. REINSTALL V-BANK COVER
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.