Hi thanks for looking. I bought a 540i last thrusday. the owner told me he had someone plug it into a diagnstics machine and it needs new 02 sensors? can anyone tell me what they are and also what result that means to me and how much? also the air flow meter connected to the air intake was not plugged in! he said he unplugged it when he plugged the diagnostics machine in. Now I know it has a problem.
I took his word for it and bought it cos it ran ok on the test drive. since then it has ran well, i put some redex in a tank full of fuel and that seemed to help the mpg . . . . . .
since then this morning it didnt open on the key fob. so i used the key manually, i only have one key, in a pretty bad condition! an hour later or so the key didnt work when i tried to open it and all the engine wouldnt start, like it had a flat battery, i jumped started it, it seemed to run fine when i drove straight to kwit fit, the guy changed the battery, started it and the engine revved up to 1500rpm then it went straight out or off. he done it three or four times and it kept doing it. this was the first time it started and then cut straight off. he said it could be the battery he didnt have another one at the garage. i went to another garage and they checked my batt and it was fine!! but the problem persisted with my battery or the new one. i had to rev it and apply the braked to get into drive and crawl home!!!
please can someone let me know if this could all be related to the o2 sensors, or the air flow plug or anything else it could be.I am so thankful for you reading this long ass post and would greatly apreciate ur help.