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Q:

I hear a knocking in rear inside panel, just under the door locks... on 2002 Ford Explorer

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it is not the door locks, it starts the minute you put the keys in the egnition...it is behind the panel...what could it be...it is NOT the lock mechanism...it is below it..it is electrical and behind the plastic panel on drivers side next to the third seat.
(1) Answer
(1) Comments
there is a fuel pressure sensor there but it should not make noise. have a shop listen to it to identify the noise.

Roy
we noticed the sound gets louder when the rear heat/ac is turned on...and softer when turned off....doesnt go away completely....we found it is a damper door actuator that had gone bad, thanks for helping by giving me an idea of what it might have been, I learn so much from chat lines like this, once again, thanks!