If you mean the on board computer and yours is an E30 its under the dash above the glove compartment. Disconnect the battery ground and take out the glove box the undo the four bolts holding it up. Take off the harness connector by pulling the metal lever and the connector will swivel off the computer.
Check out the realted link for some advice on how to reset the computer in your 2003 BMW 325I computer.
Depending on the year there may be anywhere from 1 to 8 computers in a 325i
take out the battery. Or if all else fails take it to the garage where they will connect it to their computer and do the diagnostics
The oil pressure sensor on a 2004 BMW 325i is located on the bottom, right side of the engine. It is screwed into the block and has an output wire which sends information to the computer.
I have a 2006 325i and i have jumped it.
i have the same problem on my 325i, i got checked and serviced. the dealer said there is nothing wrong i think the computer might just be tripping.
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