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2010 2011 BMW 5 Series Forum F10 F10 Technical Topics Engine, Transmission, Exhaust, Drivetrain, ECU Software Modifications Booost Solenoid Replacement
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      01-02-2022, 04:31 PM   #1
MarkyMidnite
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Hey guys, I replaced my boost solenoid today as I was getting drivetrain warning and also had the code 120308 boost low. After replacing, should I clear the stored code(s) ? There was no CE light or anything, just not sure if it needs to be deleted or should leave it as stored. Thanks !
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      01-02-2022, 10:46 PM   #2
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Hey guys, I replaced my boost solenoid today as I was getting drivetrain warning and also had the code 120308 boost low. After replacing, should I clear the stored code(s) ? There was no CE light or anything, just not sure if it needs to be deleted or should leave it as stored. Thanks !
If you do not have to get a smog check then clear the codes. If you're using the old boost hose to the solenoid cut off a small piece from the end of the hose so you get a fresh, clean connection.
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      01-02-2022, 10:54 PM   #3
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Originally Posted by MarkyMidnite View Post
Hey guys, I replaced my boost solenoid today as I was getting drivetrain warning and also had the code 120308 boost low. After replacing, should I clear the stored code(s) ? There was no CE light or anything, just not sure if it needs to be deleted or should leave it as stored. Thanks !
If you do not have to get a smog check then clear the codes. If you're using the old boost hose to the solenoid cut off a small piece from the end of the hose so you get a fresh, clean connection.
Got it, yah I did that with the hose too. Thank you !! It's insane how much power I got back by replacing it.
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      01-03-2022, 07:59 AM   #4
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Is this something that should be changed as maintenance for higher mileage? Or just leave alone if not broke?
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      01-03-2022, 12:44 PM   #5
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Is this something that should be changed as maintenance for higher mileage? Or just leave alone if not broke?
I was getting drivetrain malfunction and also had a boost low code stored.. I could feel it not boosting at times and like struggling. So I think it's just replace when there's an issue with it kinda deal.
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      01-03-2022, 05:15 PM   #6
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Originally Posted by OnlyGerman View Post
Is this something that should be changed as maintenance for higher mileage? Or just leave alone if not broke?
I was getting drivetrain malfunction and also had a boost low code stored.. I could feel it not boosting at times and like struggling. So I think it's just replace when there's an issue with it kinda deal.
Another drivetrain malfunction tip could also be the vanos solenoids. Pull both out, spray them down with brake cleaner and the reinsert. They help with low end grunt and top end. There's YouTube videos out there on how to do it. It simple and cheap.
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      05-14-2022, 06:50 PM   #7
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Very helpful post, Thanks!
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