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Hi..there..Its a very common problem on the vauxhall 2.2dti and 2.0dti diesels - normally the only pump you can swap straight to engine is the single multiplug type "psg5" EDC ontop of the pump ensuring the codes numbers on your pump are the same as the secondhand pump it will should be plug and play with no coding required.... but these are usually found on the old Vectra B - The Vectra C has the same pump but a double plug type "psg16" EDC ontop..those are the ones that have the immobilser intergated and need reprogrammed to the car for it to start usually on tech2/opcom type diagnostic software..but having said that there alot of companies out there who can repair the edc on the pump "www.ecutesting.com" for example...i do hope this helps...if you need ask anything further then please do before you rate
Many thanks. I have a single plug unit so it seems that the new second hand pump is worth a try, although paying £160 for it is still a risk. thanks again