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Dear Friends I need your advise on this. I brought this car 6, 7 month back and i realized the fuel consumption is very bad. some times it is 6 Kmpl. also noticed that the exhaust is dark. So I taken my car to 2 different mechanics and they did almost every thing. then consumption became 7-8 kmpl . but the issue is exhaust pipe got carbon soot and plugs look bit a dark . No MIL indication and no error on engine scan Emission test was passed see my tuneup details. Tuneup 1 - mechanic 1 clean all injectors replaced the Air filter Unable to remove throttle body due to bad bolt. Applied injector cleaner in to that Same issue Tuneup 2 - mechanic 2 Clean all injectors Removed the manifold and cleaned all of them Cleaned the EGR Valve Cleaned Throttle body - by removing it from manifold and cleanned all sensors Replaced the Spark plugs - iridium Same issue Tuneup 3 - mechanic 2 Replaced all 4 injectors. Cleaned the Throttle body replaced the air filter doesn't seems fixed the issue. Now the same mechanic saying , replace oxygen sensor 2 next to catalytic converter. I have spent hell of money on this issue and bit a reluctant to spend more rather not knowing exact fault. I went to Anuradhapura on week end and it dose only 12 Kmpl. so i think it should do more than that. Do you think this is normal? . Can this be a Oxygen sensor issue ?cannot see the error on the scan . The same mechanic said, some occasions sensors may not get 100% faulty but the reading may get degraded. but i'm not convinced with that. Hope you understand the this and waiting for your valuable comments thank you

Hello, please I need your help. I am using Nissan cefiro A33, recently I observed that when driving the gear is running smooth but when I applied break there is drawback with sound when the gear is returning back. But during pick up time the gear is smooth. Please advice me on what to do. Thanks