Question about 2006 BMW 545i

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How do i know if it is time to replace the baterry in my 2005 bmw 545i? for example, the trunk was opened during a tire rotation and car barely started. also at the car wash, it did the same thing. it barely cranked over, but it did start after a few crank. please help

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  • Anonymous Mar 29, 2014

    my car runs perfect but code p0491 came up and when off only came up when am driving on the city

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Car battery has about a three year life, It still may have 12 Volts and the Cranking Amp is no longer there. 
Keep in mind that if the voltage drops under 10.5 Volts, the Car's computer will not activate the fuel injector. Short story, the engine may turn but it will not start.
Good luck and hope this helps. Change the Battery and have them check the Alternator and Starter too when you have them change the battery.

Posted on May 12, 2009

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The best way to determine the quality of your battery is to load test it. It has to be fully charged, and it requires special tools. Many aftermarket parts places will test them for free. they can test them on the vehicle i believe, but i think it is best to remove the battery and take it up there. that way they can fully charge it up before testing. (on a side note, don't plan on waiting if it has to charge; it can take a while)

Posted on May 12, 2009

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You should replace the battery, bring it to an auto parts store and have them check it to see if it is still at 12.6 volts and put a load test on it. If its not your battery it is your alternator, but I highly doubt it because all the electrical gadgets would wear down the battery and it would just go fully dead.

Posted on May 12, 2009

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You can take it to most car repair shops or stores such as auto zone and they can test the battery for you. Hope this helps!

Posted on May 12, 2009

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Ivan

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