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In order to change either or both of the Knock Sensors, you must first remove the wire connections. The sensors are physically located directly underneath the intake plenum. You will need a metal tool to remove the fuel lines also. Needle nose pliers may be needed to extract them. You will need to use some sort of sealant on the new sensors.
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Where is the anti-knock sensor on a 2003 Chevy Avalanche?
you mean knock sensor
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That engine has 2 of them and you MUST remove the intake manifold to service the knock sensors.
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The knock sensor on that vehicle is located under the intake manifold. The intake manifold must be removed to gain access to the knock sensor.
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