Hi I'm currently having issues with the dreaded trans fail safe prog making an appearance on my 2002 (52) 3.0d with 113k on the clock. So all was fine until I went round a round about and went to overtake a Lorry. I put my foot down it down geared took off then just revved as if I put it in neutral, tried to change manually but nothing. Message came up on the dash I pulled over and got AA to take me home. Now I've drove it round my block came up once I hit 4th gear drove fine up until 4th.. Today I took it to a garage and drove it there in manual and drove perfect changing every time I told it to.. Went into 4th for about 30 yards and again no issue.. Scanned and cleared the codes and drove it in auto and came up again as got into 4th.. Now I'm being told it's pretty much knackered and need a new part inside the box that tells it when to change gear? And maybe need a new box at around £1000-£1500? Any pointers advice etc would be great!!