I used to get that fault, and for me it was the brake light switch which prevents the cruise from engaging.

 

My 407 had the same fault, it went when I change the EGR valve and it finished "learning".

 

You need to get it onto planet 2000 (peugeot diagnostics) or any another good level diagnostic equipment.
Check for intermittant brake or clutch switch faults...e.g. if you get a clutch
switch fault then change out the switch...
Ron.

 

Cheers guys I will check the switches, I assume they will be somewhere on the pedals. Had car checked on a high level diagnostic in June because I had an intermittent crank sensor fault. That was the only fault showing and it was sometimes refusing to engage cruise at that time. It can happen if its cold and I try to use on a local 40 mph dual carriageway (with gatzo's) or it waits until I hit 50 mph to then flashes up the warning on the centre screen automatically. Suppose I had better get the EGR cleaned/changed anyway, I bet it has never been done. Thats why I got the DPF professionally removed, it was absolutely clogged solid. Can a dirty EGR cause it sound it bit rough sometimes, i.e. on a cold start?

 

Ah, you would think the brake switch would be on the pedals, but on the 407 its not quite.... its in the passenger footwell! The brake pedal is connected via a bar behind the centre console - the conversion from LHD to RHD :lol:

 

Thanks jmkent and risky1 for your help. I was wondering where the brake switch was lol, like you say it was originally designed for those that drive on the wrong side of the road. They 'seem' OK but as for the EGR, not sure if I fancy tackling that, it might have to be a visit to the garage. It not that I am scared of the mechanical works but I dont want it to put a fault on the ecu or anything daft like that. From what I have read, this appears to be another piece of modern engine design that soon gets gunged up and knacks the parameters set in the ecu, a bit like the DPF.

 

I would have though it would have been a brake pedal or clutch pedal switch

 

Get it diagnosed with Planet/Diagbox and find out exactly which fault is causing it.
It'll show you the fault history as well as just the faults showing now.

There might be someone on here who can do it for you much cheaper than Peugeot: http://www.peugeotforums.com/forums/maintenance-9/diagnostic-peugeot-planet-map-7734/

 

Going to get EGR cleaned out anyway so will try that first. As I said it has already had a high level diagnostic and only revealed the intermittent crank sensor fault. I get your point though, possibly Planet might go deeper. I did look at the switches, don't look knocked about or got damp or the like. Being an sparky got me thinking about some control panels I worked on at a farm, It had Italian relays, and sometimes had ambient temperature related issues i.e. in the colder months the switch contact could get iffy. The only thing I know is, this only happens when its cold, and when its going to happen the car sounds a bit rough on start up, sort of a bit rattley. Turn her off after a couple of miles and restart, much smoother and cruise will work. Could the EGR cause it to be a bit rough, if say its sticking either open or closed ?