I have a 2003 540, a CEL came on yesterday when I started the car. Still on this morning and there is a rough idle, almost sounds like a low drum beat. Also noted, when accelerating, I hear the drum beat and some hesitation. I ordered the C501 scanner but wont be here until Friday. Any suggestions on were to start?
Take the car to AutoZone or another car parts retailer and ask them to check for codes. They offer that service for free. Report back what P codes are found.
2000 528i sport
EMP Stewart water pump
Dice iPod adapter
Alpine amplifiers
MB Quart speakers
MTX BGE12 subwoofer
AudioControl EQL equalizer
Pulled codes, at local shop appeared to be a bad coil pack. I forgot to get the code number. Replaced it last night car seem to be fine now.
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