Knocking noise when car is Stationary

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Azmuf1

New Member
Joined
Jul 6, 2022
Messages
8
Location
Leamington
Car
Mercedes Cla
Hi,

I have had a random intermittent knocking sound which comes from the bottom end of the car below the drivers seat a couple of times over the last few weeks. Only happens when the car is stationary after 5 mins after the car has been parked up for a few minutes with the engine on and when the AC or the fan is left on.
The car is a 2014 c220 diesel Cla (auto)
The car has no warning lights on and drives fine.
Not sure if anyone has come across the issue, will borrow a friends odb reader to check for any error codes over the weekend also.
Thanks in advance for the responses.
 

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