More and more regularly when using the ACC I'm getting a "radar blocked" warning and the system disengages, followed by a second, much longer note on the dash which says something along lines of "IEB system deactivated..." Everything usually re-engages within a few minutes (no need to restart ignition) and, from memory, more often happens in bad weather. Sometimes also prevents engaging system in the first place but, again, usually changes its mind after a few minutes.

Does anyone know where this radar sensor is? Always assumed it's the set of lenses under the rear-view mirror but that's swept by the wipers so shouldn't ever be "blocked".

Any ideas about whether the problem really is down to dirt or if it's more likely to be a software glitch would be very helpful.

Think they are cameras, the radar system is below the front number plate.

I got that message once, during a monsoon type rain storm. never seen it since. MY2016 HSE D SDV6 - gone due to fuel dilution problems.

By the age of 50 you have the face you deserve - George Orwell.

The radar is the flat black plate beneath the number plate. Check it is not blocked just in case! MY16 3.0 SDV6 Autobiography in Aleutian silver, stealth pack and toys.

Had this issue the other day when driving in a snow shower, the sensor is located I the front under the grill,, didn't take much snow to cover it, once blocked forward alert and camera's no longer function 2010 RRS, TDV8
bali Blue / colour coded
side steps / flappy paddles
black perforated leather
22" overfinch
heated everything, TV,fridge ...... now with gold calipers and mud flaps !( black mud flaps that is) !!
Many years ago,,,,, 1955 series 1 landie , sometimes wish I had kept it

This has been a problem with DiscoSports and Evoques with ACC and the smart braking system and there was found to be a fault with the camera linked to the IEB system - check that it isn’t dirty but also you may have to visit a service bay for warranty work. 2020 Pangea Green 1st Edition D240 New Defender 110 is here and loving it
2018 Melting Silver Mini Countryman PHEV - soon to be replaced
2015MY Corris Grey SDv6 HSE Dynamic, the best car I have ever owned, totally reliable only a cou0le of rattles in 3 years, now no longer in my care
Also in my garage is a 1996 TDi300 Defender 90 County HT made into a fake CSW

IEB is radar. AEB is camera. RRS MY17 SDV6 AB
Evoque MY17 TD4 AB