Car shut off after about 30 minutes - Mercedes-Benz Forum
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post #1 of 12 (permalink) Old 09-29-2018, 04:25 AM Thread Starter
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Car shut off after about 30 minutes

My daughters car is a E300 sport, and she just got to really drive it yesterday. She had just passed her driving test, anyways she drove it for about 30 minutes and than stopped at the store. It would not start back up. We checked fuel pressure and that seemed fine, than we used a code scanner and it gave us 2 codes, 1 said battery 1 said crankshaft sensor. We replaced the battery and car started right up. She drove it back to her friends house and it shut off again. She let it sit over night and tried again this morning. Car started right away but after about 30 minutes, shut off again at the red light. Anyone have this problem. Thanks
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post #2 of 12 (permalink) Old 09-29-2018, 04:36 AM
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That sounds like a crankshaft position sensor. It usually manifests its problem by refusing to allow the car to start when it is hot and then being okay after the passage of some time for things to cool down. Not sure about the battery, but the time it took to replace the battery probably was enough to allow the CPS to work again.

This is a pretty common issue and is not a terribly hard DIY, if you want to do that.

What year is the car?
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post #3 of 12 (permalink) Old 09-29-2018, 05:11 AM Thread Starter
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It's a 2003 and my mistake it's a E500 sport not E300. Not sure if that makes a difference.
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post #4 of 12 (permalink) Old 09-29-2018, 06:21 AM
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Same answer, I think.

If you replace the CPS, you may want to stay with an OEM part.
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post #5 of 12 (permalink) Old 09-29-2018, 06:41 AM Thread Starter
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I believe we are going to change it, thank you for your help!
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post #6 of 12 (permalink) Old 09-29-2018, 09:30 PM
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no doubt this is the crank shaft position sensor... replaced mine on 300K E320 wagon a few times. Easy diy job.. google on youtube. Bosch part is inexpensive.

On your battery code... the average autozone battery is insufficient for the power demands for these cars... I know this from first hand experience. If your are talking about the main battery; there is also an aux battery of course.

I am not one of these type A's for genuine OEM. The battery? Bite the bullet and get an original one from the dealer.

Last edited by popfischer; 09-29-2018 at 09:38 PM. Reason: additional info
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post #7 of 12 (permalink) Old 09-30-2018, 02:58 AM
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If the problem is still with you after crank posision sensor is replaced .It will need the charging system checked . The engine managment will close down the engine if the battery voltage drops to low . This is to stop information being lost from the computer . Alternator or regulator replacment will put it right .

This is a retro ride .
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post #8 of 12 (permalink) Old 09-30-2018, 04:56 AM
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Please only use a Genuine Bosch or MB crank sensor. It is worth waiting a couple of days for the Bosch.
Amazon and O'reilly both have them at about $30 USD.
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post #9 of 12 (permalink) Old 09-30-2018, 06:19 PM Thread Starter
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Thank you all very much. we did replaced the sensor yesterday and car is running great so far. Again thank you all very very much, you've made her a very happy young lady!!!
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post #10 of 12 (permalink) Old 10-05-2018, 11:23 AM
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Originally Posted by Noodles View Post
Please only use a Genuine Bosch or MB crank sensor. It is worth waiting a couple of days for the Bosch.
Amazon and O'reilly both have them at about $30 USD.
Is O.E.M. brand same as Bosch or Genuine Bosch?
All RMeuropean, AutohausAZ and Amazon carry O.E.M. brand.

Thanks,
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