That wax just looks like the actual wax used in the factory to seal the metal parts from corrosion.

Its pretty annoying to weld new panels on a vehicle when this wax keeps melting and dripping everywhere (I used to be in Autobody repairs years ago)

 

Hello Mark

I never got back to it. But it does bother me that my PTS is now intermittent. I will post a video soon. I might have moved one small step towards fixing the PTS rear.

I might follow the actions in the other forums. Take everything apart and clean each sensor.
benzworld forum

 

As promised, I will now be posting a video of my experiment.



Test subject at point blank

Link to video on my google drive. Caution, file is 188mb

https://drive.google.com/file/d/1luK...w?usp=drivesdk

 

Update - I had a bit of time to investigate mine last weekend and found a faulty rear sensor (used an iCarsoft MB V3.0 to check sensor readings and one was always showing 255cm regardless of distance). Swapped it for a genuine second hand one and the system is now working flawlessly. I haven't checked if the sensor voltage is still only present when braking since getting the system working but it seems that is probably normal and certainly wasn't the cause of the issue on mine. Hope this information is helpful to you and anyone else having the same red lights and beep issue!

 

Good that you have fixed your problem. There is a high possibility that mine are individual sensors faults also. But I am not willing to purchase new sensors at this stage of inflation. The reverse camera is still there and it ismanageable.