Hi all...a little help please.

Just changed the rear ace pipes on our discovery and once i restarted it it twitches every ten seconds or so. If i drive it it throws up a red ACE light on the dash board...had a job to get old pipes out but wasn't aware i'd done anything wrong. Could i have inadvertently attached pipes the wrong way at the valve block end,,,i'm sure i copied the others but diagrams i have found are sketchy.

Cheers, Nick.

I deed indeed manage to swap the pipes...Ah well swapped them the other way around and the twitching stopped. Just need to get two new seals now.