I have a BMW 525i 1991, and the battery is dead but i see no battery under the hood just a positive post where the manual says the battery should be. Do i have to take my whole car apart just to change the battery?
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It has four. The first two are called the pre-cat (catalyst) or hot side. They are located under the hood on the left side (when standing at the front looking at the motor) on the exhaust manifold. The other two or called the post-cat or cold side. They are in the exhaust pipes coming down from the motor under the car at the passenger side. Replace them with genuine Bmw parts. They are more expensive but you won't have any issues. A lot of problems come from aftermarket sensors because the calibrations aren't the exact same.
Quit looking under the front hood...it isn't there. The BMW and Porsche 928 folks love to put the battery in the back. BMW---in the trunk under the right (passnger side) access panel. 928----rear hatback a little left of center under the spare tire. Genius those Aryans.
under the hood there is a POWER POINT for you to hook up jumper cables . use it ! attach jumpers to a running car ,or a charged battery . this will power up your car and let you get into your trunk . GOOD LUCK