i have a 56 reg laguna 1.9dci ( 130 bhp ). last week there was a whistling noise from the engine bay and there was very little power on acceleration. i took it to the garage and a pipe from the exaust to t turbo was replaced as it was split. this did not cure the problem so a sensor was replaced in the exaust. at this time 2 warning messages were being displayed, check iginition and check emmisions. i got the car back last night and when i drove this evening there was still no power and the check ignition light came on again. i would appreciate any advice, and thank you in advance for any info.