I have a 2005 vectra 1.9CDTI (150).
Just bought it at auction (gulp). turns out it was only going well enough to drive slowly through the auction - hmmm.
It was (and is) very low powered with the spanner light on. It can barely make it up a hill. don't know if limp mode is normally that slow?
Using this valuable forum I soon found out that my intake manifold was well knackered. Obtained and fitted a new one complete with actuator.
Op com gives one fault code of P2279-11 intake air system leak detected.
EGR taken off and cleaned, it was free anyway. Using op-com to activate the EGR proved it to be working.
Checked the intercooler and hoses by putting my hand across the air to turbo intake hose and it had very high suction - presumably if any of that pipework was leaking there would have been little suction?
Any of you help me where to go next please? Worth many beer tokens (a few mates from work saw me buy it and I can't live it down).......