View Full Version : No engine codes showing on 1994 540i

09-29-2008, 03:32 PM
I occasionally get the check engine light while driving, but cannot get the check engine light to blink any codes following the press accelerator 5 times in 5 seconds procedure (ie not even the fault free code). I disconnected the cruise control cable recently (65mph and the thing got stuck open!), but otherwise everything is fine. Anyone know why I can't get the computer to give me any codes? Thks

10-01-2008, 06:15 PM
Problem solved, but not completely sure how. The only possible thing I did different was turn off the motor and completely remove the key before trying again. Anyway, it seems the O2 sensor is what is causing the check engine light, although it didn't come on at all today.