New to this so bare with me!!!
Car is a E46, 318ci, 2000. I have a problem with, i think, a bad earth but would welcome more info.
Recently my engine management light came on, had it read and bought up post cat lambda sensor and camshaft position sensor. Replaced both and had management reset, About a week later, engine management again, read again and same codes. Reset, and its back yet again, with same codes! Looks like i've replaced sensors for nothing and is probably a wiring fault/bad earth.
Not sure if it helps, but mpg has dropped to around 22mpg, which includes a fair bit on the motorway, however car runs smooth except for a little shaking on idle.
Please help, not sure where to go but would like to have a crack at it myself, if i can.
Cheers in advance