lavan Posted November 7, 2017 Report Share Posted November 7, 2017 Hi All, I had a mechanic replace my clutch and flywheel on my 330cd (204bhp M57n) and whilst doing this he managed to catch the lambda sensor cable in between the bellhousing and the gearbox. We replaced the lambda sensor and some faults appeared. However, after googling these errors, they were from one of the fuses in the ECU fusebox (the second 20amp fuse) and this cleared most the codes. However, one code remains: "4205 - Lambda Sensor Heating -Short Circuit to B+" Now I have replaced the sensor and no other errors are there. Also my MPG has dropped, and I am guessing it is due to the above error. After clearing it reappears immediately. Any help will be appreciated! Quote Link to comment Share on other sites More sharing options...