Do you need to back up the power when replacing the battery in a BMW E91?

BMW driver question

Reading your articles about batteries, I know that you need to code a new battery. Now I have a question about its physical replacement. Can it be unplugged, removed and a new one inserted? Does the vehicle need to have power backup through a charger, for example?

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The phenomenon of “left air” in BMW – what is the cause and how to fix it?

BMW driver’s question

After a long stop, I start the car without problems, but after about three minutes without adding gas, that is, without starting, the revs drop sharply and the car goes out.

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Ignition and battery problems in BMW – how to fix it?

BMW driver question

I have a problem with igniting the car. Within a week replaced the alternator and battery with the same parameters as the one used before. The next day the car fired up on the second attempt. During the day it fired up without any major problems.

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Low pressure on several cylinders in a BMW – what is the cause and how to fix it?

BMW driver’s question

I am writing to you about the repair or overhaul of the M52B28 engine. A 1996 production engine and therefore a single Vanos. I recently measured the compression and discovered errors on two cylinders.

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How to properly take care of a BMW with automatic transmission and xDrive?

BMW driver’s question

Wanting to take the utmost care of my vehicle, I would like to ask about some operational issues related to the drive.

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Significant coolant loss in BMW – what is the reason and how to fix it?

BMW driver question

The following is a series of faults related to coolant and oil depletion in my BMW. Please let me know what could be the cause and how to fix it.

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Noises on a cold internal combustion engine in a BMW – what is the cause?

BMW driver question

I would like to ask for an opinion on the loud firing of my car. When the engine is cold, immediately after firing up I can hear a loud crunching sound for 2-3 seconds, which immediately stops. After that, everything is OK. It runs beautifully, evenly and quietly. On a warm engine it rarely happens.

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How to prevent timing damage in BMW?

BMW driver question

How can I prevent the timing chain from failing? Do any symptoms appear in advance? Is it possible to check it? I should add that I bought a BMW and have already replaced the timing gear along with the oil pump.

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Irregular knocking in the BMW engine – what is the cause?

BMW driver question

I have owned a BMW E91 for a year and a half. I have scrolled through the forums and YouTube and have not found a definite cause for the knocking in my engine. I have read various diagnoses that pointed to problems with:

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Windshield wipers in BMW stop working during a downpour – what is the reason?

BMW driver question

I have a problem with my windshield wipers. The first failure happens to me three months ago during a downpour and I was unable to turn them on. After stopping for an hour, everything returned to normal. Currently, sometimes they work and sometimes they do not. Turning the engine off and on, does not help. What could be the cause of such a malfunction?

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