hi there

I have a problem with the EGT sensor...
As soon as I connect everything and hold the sensor in my hand, everything works perfectly.
As soon as the sensor has contact to the vehicle ground, i.e. when you install it, the error "no connection to the sensor" appears.
As soon as the sensor is removed again, everything works.

Heating the sensor with a lighter works and the display goes up.

If I put a shrink tube over the sensor and install it so that there is no contact to ground, then everything also works.
However, as soon as the heat-shrink tubing is burnt and there is ground contact, the error occurs.

What is the cause of this?
Should a new sensor solve the problem?

As additional information.
Oil pressure and oil temperature are also connected to the control unit and these work without any problems.

It concerns the BF series

Thanks for your help