Engine malfunction-brake vacuum sensor or seal.

E90_Dave · 02-17-2019, 02:45 AM

Car thrown into limp mode but goes away after i turn it off and restart it, but comes back after 10-15 lines of moderate driving. The engine sounds fine but the idle jumps right after the engine malfunction comes on. I hear this noise. I believe it's either the brake pressure sensor is bad or the brake booster seal is bad. I know the brake booster runs off vacuum so that could be it. Curious what you guys think. I hear the brake vacuum pump activate a lot more than normal, almost running all the time to be exactl.

Redd · 02-17-2019, 03:04 AM

Sounds like brake vacuum sensor. Common problem.

strokemycocktus · 02-17-2019, 02:17 PM

Did you have any fault codes?

Redd · 02-17-2019, 05:38 PM

I don't remember on mine, but internet says it should be P1209.

E90_Dave · 02-17-2019, 09:45 PM

Quote:

Originally Posted by Redd

I don't remember on mine, but internet says it should be P1209.

I'm going to check the codes tomorrow it's Sunday and everywhere is closed. Fingers crossed it's only the brake vacuum sensor.

E90_Dave · 02-19-2019, 12:58 AM

Quote:

Originally Posted by Redd

I don't remember on mine, but internet says it should be P1209.

These were the codes i replaces the brake vacuum sensor. Not sure if it cleared the issue only way to tell is to go on a drive.

RevFreak · 02-26-2019, 08:18 PM

Strange I’ve been dealing with this problem as well, got the brake booster and brake vacuum sensor replaced and the car runs fine. Only problem is every time I start the car no matter how long it’s been off it needs to stay on for about 10 mins before I actually start driving if not boom engine malfunction. Any help?

E90_Dave · 03-02-2019, 04:01 PM

Quote:

Originally Posted by RevFreak

Strange I’ve been dealing with this problem as well, got the brake booster and brake vacuum sensor replaced and the car runs fine. Only problem is every time I start the car no matter how long it’s been off it needs to stay on for about 10 mins before I actually start driving if not boom engine malfunction. Any help?

Have you replaced the whole assembly or just the sensor ? I've heard of this issue coming up if the check valve in the brake vacuum sensor brake booster line going bad.

serranot · 03-02-2019, 05:42 PM

Throttle actuators . . .

Mvy · 03-03-2019, 07:47 AM

Since you replaced brake vacuum sensors, perhaps fuel tank breather valve? Just a guess as that commonly causes idle flux.

E90_Dave · 03-04-2019, 10:18 AM

Quote:

Originally Posted by Mvy

Since you replaced brake vacuum sensors, perhaps fuel tank breather valve? Just a guess as that commonly causes idle flux.

Usually causes uneven idle randomly or after fill up but not really limp mode

02-17-2019, 02:45 AM	#1
E90_Dave White E90 compack 8 Rep 24 Posts Drives: White red Novillo leather E90 Join Date: Oct 2018 Location: San diego iTrader: (0)	Engine malfunction-brake vacuum sensor or seal. Car thrown into limp mode but goes away after i turn it off and restart it, but comes back after 10-15 lines of moderate driving. The engine sounds fine but the idle jumps right after the engine malfunction comes on. I hear this noise. I believe it's either the brake pressure sensor is bad or the brake booster seal is bad. I know the brake booster runs off vacuum so that could be it. Curious what you guys think. I hear the brake vacuum pump activate a lot more than normal, almost running all the time to be exactl.
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02-17-2019, 03:04 AM	#2
Redd Brigadier General 3900 Rep 4,165 Posts Drives: 2010 BMW E92 M3 Dakar Edition Join Date: Jul 2015 Location: Malaysia iTrader: (0)	Sounds like brake vacuum sensor. Common problem.
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02-17-2019, 02:17 PM	#3
strokemycocktus Lieutenant 119 Rep 423 Posts Drives: E92 M3 6MT ZCP Join Date: Jul 2016 Location: Europe iTrader: (0)	Did you have any fault codes? __________________ strokemycocktus
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02-17-2019, 05:38 PM	#4
Redd Brigadier General 3900 Rep 4,165 Posts Drives: 2010 BMW E92 M3 Dakar Edition Join Date: Jul 2015 Location: Malaysia iTrader: (0)	I don't remember on mine, but internet says it should be P1209.
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02-26-2019, 08:18 PM	#7
RevFreak Registered 0 Rep 1 Posts Drives: E93 M3 2011 Join Date: Feb 2019 Location: Van Nuys, CA iTrader: (0)	Strange I’ve been dealing with this problem as well, got the brake booster and brake vacuum sensor replaced and the car runs fine. Only problem is every time I start the car no matter how long it’s been off it needs to stay on for about 10 mins before I actually start driving if not boom engine malfunction. Any help?
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03-02-2019, 05:42 PM	#9
serranot Lieutenant 324 Rep 488 Posts Drives: 2011 E90 M3 6MT Join Date: Mar 2011 Location: Middletown, MD iTrader: (0) Garage List 2011 BMW E90 M3 [10.00]	Throttle actuators . . .
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03-03-2019, 07:47 AM	#10
Mvy Captain 541 Rep 979 Posts Drives: 2008 E93 M3 Join Date: Nov 2014 Location: GA Peach iTrader: (0)	Since you replaced brake vacuum sensors, perhaps fuel tank breather valve? Just a guess as that commonly causes idle flux. __________________ Harrop Supercharger, BPM Tune, K/W Coil over kit, Stoptek BBK, Magnaflow exhaust, ear to ear grin everytime I drive...
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