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 Land Rover Freelander (LN) V6-2.5LFACTORY OEM SERVICE PROCEDURE
Knock Sensor: Description and Operation
Knock Sensor
Description
The KV6 engine is fitted with one knock sensor to each bank. The knock sensors work by the piezo-electric effect, which is the excitation, created by movement caused by engine detonation. The ECM reads in this signal and makes the necessary A/F adjustments.
A fault is detected if:
1. The engine speed is greater than 2850 rpm and the noise level received from the sensor is lower than expected. The noise level is checked at every 240 degrees of crank for each sensor.
Factory Service Tools
Use the Manual With the Right Hardware
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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.