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02-10-2021, 02:06 PM | #1 |
Captain
113
Rep 934
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Engine limp mode randomly
My E92 M3 has been behaving very well and the last time I drove it was a joy. Recently the battery went very low - yellow battery light on dash. I put the car on a CTEK and recharged the battery/restored it fully. now its holding about 12.9V
Anyways when you now start the car immediately you get the engine check light and reduced power mode comes on. The car will not rev and even the idle is very lumpy and sometimes nearly stalls. I have put the code reader on it - ISTA+ and got the following codes 2794 - DME brake booster vacuum pump signal 27E4 - DME brake booster vacuum pump plausibility I cleaned down the faults and then closed car, 5 mins passed and then restarted and they come straight back. From what I have read some say its vacuum line and sensor by the brake servo. Can anyone help with this or have experience? Thanks |
02-10-2021, 02:24 PM | #2 |
Captain
1195
Rep 994
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It's common. You need this. If it helps you can just remove the sensor from the new vacuum line and throw it in the old one.
https://www.fcpeuro.com/products/bmw...vD_BwE#fitment |
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02-10-2021, 02:31 PM | #3 | |
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02-10-2021, 04:03 PM | #4 |
09 M3 e93 VF650, e30 e85, Remus, Federal’s 595rs
205
Rep 329
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Same thing happened to me but it ended up being the pump. You can just buy the sensor and not the entire assembly if you want to start there. https://www.fcpeuro.com/products/bmw...or-13628617097
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09 M3 E93 - VF650, AFD e30 e85, Remus Race, Federal’s 595 rs-pro’s.
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brake servo, brakes, fault code |
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