Anti-pollution warning, car cutting out or not starting

A solution finally! I went round the car disconnecting all the connectors I could find. Didn't find anything untoward (even checked the washer bottle connection as I have seen posts about this tracking up to the underbonnet fusebox). I also took the battery box out & cleaned up all the earth connections to the bodywork under there. Found some very corroded connections there. Note the carbodywork is painted & requires the connection via the bolt to make a good ground. Thought this might have given been the cause but still cut out & this time on a dual carriageway (I would suggest that people check these connections anyway). ALso noted that the front windscreen washers didn't work for quite a while after reconnecting the battery (rear wash/wipe was fine though!)

So I started googling a bit more but this time for Peugeot's with the same fault & bingo! Exact same symptoms & all stating that it was the fusebox under the bonnect by the battery. Ordered myself a brand new one for £72 (6500 HV) via a Citroen Dealer on E-bay. Fitted & all good. Windscreen wipers worked instantly too! It's good to get to the bottom of it & have needlessly replaces the oil pressure switch, diesel filter, removed/refitted the BSI, remoed & reconnected all the connectors I could find under the bonnet, hit the main ECU & wasted many hourse.... Hopefully this post will help others!

My car 2007 1.4 HDI was switched off and on my return had ignition lights but no starter.
More testing found no power to engine ECU but nearly everything else on the car worked.
After a load of hassle getting ECU, Comms 2000, BSI Board and Ignition key tested and everything found to be fine we tried the AA.
The AA Patrol man got close by saying there was no power to the ECU.

Another problem was the Socket for the code reader was dead too, as you would expect if the ECU was not powered up.
Two weeks faffing around checking every fuse and connection I could find, I decided to try and find another engine fusebox the same
in the breakers yard.
The diesel engine fusebox is far more complicated than the petrol one with a lot more components fitted and many more connections.
The closest fusebox I could find was from a Peugeot 307 Diesel, totally different numbers but the same sockets as mine.

This was the cure, after fitting the car started instantly and ran perfectly.
My car would often show an anti- pollution fault on the display, sometimes for several days, then it would clear and you could not find any faults listed with a code reader.
Twice it cleared on the way to have a code reader connected!

Since then it's covered a few thousand miles and only showed the Anti-Pollution warning once and again it cleared itself.
One thing I did lear when all the stuff for my car was away for testing was, if the original radio is not fitted or connected it lists it as a fault every time the ignition is switched on.
The guy doing the testing said if the radio is missing the ECU can't see several things, one being the centre display on the dash and it lists that as a fault on every startup.
Modern cars are great!!!!!!!