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.

2004 Hyundai XG350 LFACTORY OEM SERVICE PROCEDURE

Sensor Inspection

Disconnect the knock sensor connector.
Measure the resistance between terminals 2 and 3.
Standard value: about 5 MΩ (at 20°C (68°F))
If the resistance is zero, replace the knock sensor.
Knock sensor:

16~25 Nm (160~250 kg.cm, 11.8~18.4 lb.ft)
Measure the capacitance between the terminal 2 and 3.
Standard value: 800~1600 pF

Fig 1: Checking Knock Sensor Using Multi-Meter
Courtesy of HYUNDAI MOTOR CO.

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.