A Service Fault has appeared on the dash, image tends to show either rear sensors or lane departure but a local garage diagnostics show the front radar at fault.  Question is how do know what the error really is referring to?  I've checked the physical mounting of the front radar, all looks secure.  Any ideas? It's a 2016 Pulsar n-tech diesel.

 

Thanks.

Has the vehicle suffered any accident damage recently, including the front screen?

No, no accidents.  Another garage ran their diagnostic tool on the car, front radar is OK, it's the lane detection/blind spot system that is a fault, can be either the front camera in the windscreen or the rear camera, my feeling is can't be the front camera for blind spot checking.  At least the radar isn't at fault.  Question is how to fix it from here.

First thing I would do is to go around the car and clean all the external sensors and cameras (including front screen ADAS)