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.

2009 Lexus GS 350 RWDFACTORY OEM SERVICE PROCEDURE

Knock Sensor: Inspection: Inspection

INSPECT KNOCK SENSOR
1. Measure the resistance between the terminals.
  
  Fig 1: Measuring Resistance Between Knock Sensor Terminals
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Standard resistance
  
  120 to 280 kΩ at 20°C (68°F)
  
  If the result is not as specified, replace the sensor.

Factory Service Tools

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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.

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