Disconnecting Battery On '93 525i - BMW Forum

DANSBMW · 02-19-2005, 05:00 PM

I have a '93 525i that's showing its check engine light. I have tried the accelerator pedal routine to make it read the trouble codes, but with no luck. I have read that disconnecting the battery for a few minutes can reset the light. I'd like to give that a try, and if the light comes back on, try the pedal routine again to read the codes. My question is, what other problems will I run into if I disconnect the battery? Like needing to reset the radio theft code? Will the airbag light come on?
Thanks,
Dan

riverarb · 03-02-2005, 10:35 PM

I would replace the Oxygen Sensor, when was the last time you replace it. Normal replaement milage is around every 30-50K miles. It could be also something as simple as your fuel cap. Take your car to the nearest emissions control center and have them check it out, here in Maryland the

is cost $14. Better than wasting $100 plus for a oxygen sensor only to find out it was something less expensive! Oh, by the way..my 525i is a 92 w/230K miles & running strong.

da_bull · 03-03-2005, 06:22 AM

Quote:

Originally posted by DANSBMW@Feb 19 2005, 04:00 PM
My question is, what other problems will I run into if I disconnect the battery? Like needing to reset the radio theft code? Will the airbag light come on?
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The factory radio will probably have to have the security code entered as it is designed that way. It thinks that it has been removed from the car because the battery has been disconnected. Check your owners manual, a lot of previous owners write the code down in there somewhere. You may even still have the factory issued code card. There shouldnt be any reason for the airbag light to come on.