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.
Knock Sensor
Remove knock sensor. See REMOVE/INSTALL/OVERHAUL article. On GS300 and SC300, knock sensors are located on front and rear left side of cylinder block. On ES300, GS400 and SC400, knock sensors are located in front of engine, on inside of either cylinder head, under intake manifold. On LS400, knock sensors are located in front of engine, under intake manifold, on inside of left cylinder head and left side of lower intake manifold. On all models, check for continuity between knock sensor terminal and knock sensor body (hex portion). If continuity exists, replace sensor.
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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.