Hi All. Saw a thread from Protis regarding changing of O2 sensor several times after low hours and issue is same exactly as mine. If possible would like what was outcome of his issue if Protis or someone else could be of help. Would appreciate Protis contact me as i tried but to no avail. Meanwhile here im finding lots of support from authorised dealer. Run a diagnostic test and a compression test and all seems fine. Now he suggested to check the injectors as 2 of the spark plugs seem to have more carbon build up than the other 2. He will replace sensor with a new one after 250hrs and would be the 4th new sensor. As im not technically inclined would appreciate your views. Thanks a lot cause im a bit worried about issue.