I had my timing done and after 3 weeks the tensioner on the fuel pump belt whent and the pump slipped 1/4 turn. Put new tensioner in and aligned what I think was correct pump timing marks. Started engine and it fired right up and idled fine. Drove it and then error came up. 0550. Along with that the abs and engine check and height adjustment light came on. Loss of power as if in limp home mode but could still manage 130km/h on the flat. The lights go off after lifting foot off the accelerator and then I have full normal power until I reach cruising speed and then lights come on and loss of power ( turbo ) Could this be that the timing on the pump is off by one tooth either way? Would this create the fault code of 0550 or is this error code unrelated? Car starts first time hot or cold and feels like normal full power when the warning lights are off. Many thanks fo any imput or suggestions. Should I try to adjust the pump timing by 1 tooth either way.? I think the code 0550 is related to start of injection timming? Not sure..