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      04-25-2013, 09:12 AM   #1
WarrantyTracker
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Buzzing at the A-pillar. Into limp mode with a new E92. Weird

After a day of "very spirited" driving in the mountains recently (during which the car ran like a champ all day), I got up the next day to drive again. As soon as the oil got warmed up to temp, it threw an increased emission warning. Thereafter, any time I crossed 3-4K rpm, the engine went into limp. Restarting would get it out of limp but not get rid of the emissions warning.

Weird thing is, the car was making a very distinct noise I've never heard before. It's coming from the base of the A-pillar on the driver's side, sort of in the area of the brake fluid res, or maybe underneath it; maybe near the side gill. It's a buzzing, like a cell phone on vibe, and very clearly audible. It's intermittent (lasts about 5-15 seconds once it gets started); happens pretty much every startup, but also happens at other times when the car's running.

Was in the middle of nowhere, no dealers anywhere, and it was Sunday anyway. But found a guy with a generic code reader who could at least get rid of the emissions code. Made my way back through those mountains without trouble all day.

Next day, same problem.

I know, I know, take it to the dealer. I will, and I'll report back.

Anybody know what's in that general area that could make a buzzing noise?
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      04-26-2013, 11:29 AM   #2
Moxie
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Brake pressure sensor hose. I had the same issue. Apparently if fluid spills around the brake reservoir, it leaks on to the sensor & makes the sensor go bad. I was out of warranty but BMW good willed it for me.
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      04-27-2013, 07:08 AM   #3
WarrantyTracker
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Makes sense. It's in the right spot for that. Were you getting limp mode off it? I guess it's trying to keep me slowed down so I don't overcook a turn or something.
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      04-27-2013, 02:59 PM   #4
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Yes, the car was getting limp mode.
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      05-03-2013, 09:29 AM   #5
WarrantyTracker
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Turns out it wasn't the brake sensor. No brake fluid had been spilled or leaked and everything was nice and tidy up there.

I took it to the dealer week before last. The vacuum pump died.
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